Recording of electric currents developed in the brain by means of electrodes applied to the scalp, to the surface of the brain, or placed within the substance of the brain.
Wave-like oscillations of electric potential between parts of the brain recorded by EEG.
The measurement of magnetic fields over the head generated by electric currents in the brain. As in any electrical conductor, electric fields in the brain are accompanied by orthogonal magnetic fields. The measurement of these fields provides information about the localization of brain activity which is complementary to that provided by ELECTROENCEPHALOGRAPHY. Magnetoencephalography may be used alone or together with electroencephalography, for measurement of spontaneous or evoked activity, and for research or clinical purposes.
Conditions characterized by recurrent paroxysmal neuronal discharges which arise from a focal region of the brain. Partial seizures are divided into simple and complex, depending on whether consciousness is unaltered (simple partial seizure) or disturbed (complex partial seizure). Both types may feature a wide variety of motor, sensory, and autonomic symptoms. Partial seizures may be classified by associated clinical features or anatomic location of the seizure focus. A secondary generalized seizure refers to a partial seizure that spreads to involve the brain diffusely. (From Adams et al., Principles of Neurology, 6th ed, pp317)
A disorder characterized by recurrent episodes of paroxysmal brain dysfunction due to a sudden, disorderly, and excessive neuronal discharge. Epilepsy classification systems are generally based upon: (1) clinical features of the seizure episodes (e.g., motor seizure), (2) etiology (e.g., post-traumatic), (3) anatomic site of seizure origin (e.g., frontal lobe seizure), (4) tendency to spread to other structures in the brain, and (5) temporal patterns (e.g., nocturnal epilepsy). (From Adams et al., Principles of Neurology, 6th ed, p313)
Brain waves characterized by a relatively high voltage or amplitude and a frequency of 8-13 Hz. They constitute the majority of waves recorded by EEG registering the activity of the parietal and occipital lobes when the individual is awake, but relaxed with the eyes closed.
Clinical or subclinical disturbances of cortical function due to a sudden, abnormal, excessive, and disorganized discharge of brain cells. Clinical manifestations include abnormal motor, sensory and psychic phenomena. Recurrent seizures are usually referred to as EPILEPSY or "seizure disorder."
Computer-assisted processing of electric, ultrasonic, or electronic signals to interpret function and activity.
Imaging techniques used to colocalize sites of brain functions or physiological activity with brain structures.
Brain waves seen on EEG characterized by a high amplitude and a frequency of 4 Hz and below. They are considered the "deep sleep waves" observed during sleep in dreamless states, infancy, and in some brain disorders.
The part of CENTRAL NERVOUS SYSTEM that is contained within the skull (CRANIUM). Arising from the NEURAL TUBE, the embryonic brain is comprised of three major parts including PROSENCEPHALON (the forebrain); MESENCEPHALON (the midbrain); and RHOMBENCEPHALON (the hindbrain). The developed brain consists of CEREBRUM; CEREBELLUM; and other structures in the BRAIN STEM.
Non-invasive method of demonstrating internal anatomy based on the principle that atomic nuclei in a strong magnetic field absorb pulses of radiofrequency energy and emit them as radiowaves which can be reconstructed into computerized images. The concept includes proton spin tomographic techniques.
The thin layer of GRAY MATTER on the surface of the CEREBRAL HEMISPHERES that develops from the TELENCEPHALON and folds into gyri and sulchi. It reaches its highest development in humans and is responsible for intellectual faculties and higher mental functions.
Electrical responses recorded from nerve, muscle, SENSORY RECEPTOR, or area of the CENTRAL NERVOUS SYSTEM following stimulation. They range from less than a microvolt to several microvolts. The evoked potential can be auditory (EVOKED POTENTIALS, AUDITORY), somatosensory (EVOKED POTENTIALS, SOMATOSENSORY), visual (EVOKED POTENTIALS, VISUAL), or motor (EVOKED POTENTIALS, MOTOR), or other modalities that have been reported.
Brain waves with frequency between 15-30 Hz seen on EEG during wakefulness and mental activity.
The electric response evoked in the cerebral cortex by visual stimulation or stimulation of the visual pathways.
The electric response evoked in the CEREBRAL CORTEX by stimulation along AFFERENT PATHWAYS from PERIPHERAL NERVES to CEREBRUM.
EEG phase synchronization of the cortical brain region (CEREBRAL CORTEX).
A prolonged seizure or seizures repeated frequently enough to prevent recovery between episodes occurring over a period of 20-30 minutes. The most common subtype is generalized tonic-clonic status epilepticus, a potentially fatal condition associated with neuronal injury and respiratory and metabolic dysfunction. Nonconvulsive forms include petit mal status and complex partial status, which may manifest as behavioral disturbances. Simple partial status epilepticus consists of persistent motor, sensory, or autonomic seizures that do not impair cognition (see also EPILEPSIA PARTIALIS CONTINUA). Subclinical status epilepticus generally refers to seizures occurring in an unresponsive or comatose individual in the absence of overt signs of seizure activity. (From N Engl J Med 1998 Apr 2;338(14):970-6; Neurologia 1997 Dec;12 Suppl 6:25-30)
The continuous measurement of physiological processes, blood pressure, heart rate, renal output, reflexes, respiration, etc., in a patient or experimental animal; includes pharmacologic monitoring, the measurement of administered drugs or their metabolites in the blood, tissues, or urine.
Instrumentation consisting of hardware and software that communicates with the BRAIN. The hardware component of the interface records brain signals, while the software component analyzes the signals and converts them into a command that controls a device or sends a feedback signal to the brain.
A late-appearing component of the event-related potential. P300 stands for a positive deflection in the event-related voltage potential at 300 millisecond poststimulus. Its amplitude increases with unpredictable, unlikely, or highly significant stimuli and thereby constitutes an index of mental activity. (From Campbell, Psychiatric Dictionary, 6th ed)
CHILDBIRTH at the end of a normal duration of PREGNANCY, between 37 to 40 weeks of gestation or about 280 days from the first day of the mother's last menstrual period.
Vegetative state refers to the neurocognitive status of individuals with severe brain damage, in whom physiologic functions (sleep-wake cycles, autonomic control, and breathing) persist, but awareness (including all cognitive function and emotion) is abolished.
The outer covering of the calvaria. It is composed of several layers: SKIN; subcutaneous connective tissue; the occipitofrontal muscle which includes the tendinous galea aponeurotica; loose connective tissue; and the pericranium (the PERIOSTEUM of the SKULL).
Recording of the average amplitude of the resting potential arising between the cornea and the retina in light and dark adaptation as the eyes turn a standard distance to the right and the left. The increase in potential with light adaptation is used to evaluate the condition of the retinal pigment epithelium.
A localization-related (focal) form of epilepsy characterized by seizures which arise in the FRONTAL LOBE. A variety of clinical syndromes exist depending on the exact location of the seizure focus. Frontal lobe seizures may be idiopathic (cryptogenic) or caused by an identifiable disease process such as traumatic injuries, neoplasms, or other macroscopic or microscopic lesions of the frontal lobes (symptomatic frontal lobe seizures). (From Adams et al., Principles of Neurology, 6th ed, pp318-9)
An epileptic syndrome characterized by the triad of infantile spasms, hypsarrhythmia, and arrest of psychomotor development at seizure onset. The majority present between 3-12 months of age, with spasms consisting of combinations of brief flexor or extensor movements of the head, trunk, and limbs. The condition is divided into two forms: cryptogenic (idiopathic) and symptomatic (secondary to a known disease process such as intrauterine infections; nervous system abnormalities; BRAIN DISEASES, METABOLIC, INBORN; prematurity; perinatal asphyxia; TUBEROUS SCLEROSIS; etc.). (From Menkes, Textbook of Child Neurology, 5th ed, pp744-8)
Periods of sleep manifested by changes in EEG activity and certain behavioral correlates; includes Stage 1: sleep onset, drowsy sleep; Stage 2: light sleep; Stages 3 and 4: delta sleep, light sleep, deep sleep, telencephalic sleep.
Recurrent conditions characterized by epileptic seizures which arise diffusely and simultaneously from both hemispheres of the brain. Classification is generally based upon motor manifestations of the seizure (e.g., convulsive, nonconvulsive, akinetic, atonic, etc.) or etiology (e.g., idiopathic, cryptogenic, and symptomatic). (From Mayo Clin Proc, 1996 Apr;71(4):405-14)
Organic mental disorders in which there is impairment of the ability to maintain awareness of self and environment and to respond to environmental stimuli. Dysfunction of the cerebral hemispheres or brain stem RETICULAR FORMATION may result in this condition.
Surgically placed electric conductors through which ELECTRIC STIMULATION is delivered to or electrical activity is recorded from a specific point inside the body.
A readily reversible suspension of sensorimotor interaction with the environment, usually associated with recumbency and immobility.
The constant checking on the state or condition of a patient during the course of a surgical operation (e.g., checking of vital signs).
A generalized seizure disorder characterized by recurrent major motor seizures. The initial brief tonic phase is marked by trunk flexion followed by diffuse extension of the trunk and extremities. The clonic phase features rhythmic flexor contractions of the trunk and limbs, pupillary dilation, elevations of blood pressure and pulse, urinary incontinence, and tongue biting. This is followed by a profound state of depressed consciousness (post-ictal state) which gradually improves over minutes to hours. The disorder may be cryptogenic, familial, or symptomatic (caused by an identified disease process). (From Adams et al., Principles of Neurology, 6th ed, p329)
Any visible result of a procedure which is caused by the procedure itself and not by the entity being analyzed. Common examples include histological structures introduced by tissue processing, radiographic images of structures that are not naturally present in living tissue, and products of chemical reactions that occur during analysis.
Drugs used to prevent SEIZURES or reduce their severity.
The time from the onset of a stimulus until a response is observed.
A childhood seizure disorder characterized by rhythmic electrical brain discharges of generalized onset. Clinical features include a sudden cessation of ongoing activity usually without loss of postural tone. Rhythmic blinking of the eyelids or lip smacking frequently accompanies the SEIZURES. The usual duration is 5-10 seconds, and multiple episodes may occur daily. Juvenile absence epilepsy is characterized by the juvenile onset of absence seizures and an increased incidence of myoclonus and tonic-clonic seizures. (Menkes, Textbook of Child Neurology, 5th ed, p736)
A state in which there is an enhanced potential for sensitivity and an efficient responsiveness to external stimuli.
Equipment that provides mentally or physically disabled persons with a means of communication. The aids include display boards, typewriters, cathode ray tubes, computers, and speech synthesizers. The output of such aids includes written words, artificial speech, language signs, Morse code, and pictures.
Investigative technique commonly used during ELECTROENCEPHALOGRAPHY in which a series of bright light flashes or visual patterns are used to elicit brain activity.
A technique that involves the use of electrical coils on the head to generate a brief magnetic field which reaches the CEREBRAL CORTEX. It is coupled with ELECTROMYOGRAPHY response detection to assess cortical excitability by the threshold required to induce MOTOR EVOKED POTENTIALS. This method is also used for BRAIN MAPPING, to study NEUROPHYSIOLOGY, and as a substitute for ELECTROCONVULSIVE THERAPY for treating DEPRESSION. Induction of SEIZURES limits its clinical usage.
Electric conductors through which electric currents enter or leave a medium, whether it be an electrolytic solution, solid, molten mass, gas, or vacuum.
A localization-related (focal) form of epilepsy characterized by recurrent seizures that arise from foci within the temporal lobe, most commonly from its mesial aspect. A wide variety of psychic phenomena may be associated, including illusions, hallucinations, dyscognitive states, and affective experiences. The majority of complex partial seizures (see EPILEPSY, COMPLEX PARTIAL) originate from the temporal lobes. Temporal lobe seizures may be classified by etiology as cryptogenic, familial, or symptomatic (i.e., related to an identified disease process or lesion). (From Adams et al., Principles of Neurology, 6th ed, p321)
Posterior portion of the CEREBRAL HEMISPHERES responsible for processing visual sensory information. It is located posterior to the parieto-occipital sulcus and extends to the preoccipital notch.
The electric response evoked in the CEREBRAL CORTEX by ACOUSTIC STIMULATION or stimulation of the AUDITORY PATHWAYS.
A subtype of epilepsy characterized by seizures that are consistently provoked by a certain specific stimulus. Auditory, visual, and somatosensory stimuli as well as the acts of writing, reading, eating, and decision making are examples of events or activities that may induce seizure activity in affected individuals. (From Neurol Clin 1994 Feb;12(1):57-8)
Behavioral manifestations of cerebral dominance in which there is preferential use and superior functioning of either the left or the right side, as in the preferred use of the right hand or right foot.
Devices used to assess the level of consciousness especially during anesthesia. They measure brain activity level based on the EEG.
A technique of inputting two-dimensional images into a computer and then enhancing or analyzing the imagery into a form that is more useful to the human observer.
Theoretical representations that simulate the behavior or activity of the neurological system, processes or phenomena; includes the use of mathematical equations, computers, and other electronic equipment.
A disorder characterized by a reduction of oxygen in the blood combined with reduced blood flow (ISCHEMIA) to the brain from a localized obstruction of a cerebral artery or from systemic hypoperfusion. Prolonged hypoxia-ischemia is associated with ISCHEMIC ATTACK, TRANSIENT; BRAIN INFARCTION; BRAIN EDEMA; COMA; and other conditions.
Loss of the ability to maintain awareness of self and environment combined with markedly reduced responsiveness to environmental stimuli. (From Adams et al., Principles of Neurology, 6th ed, pp344-5)
The coordination of a sensory or ideational (cognitive) process and a motor activity.
Abnormalities in the development of the CEREBRAL CORTEX. These include malformations arising from abnormal neuronal and glial CELL PROLIFERATION or APOPTOSIS (Group I); abnormal neuronal migration (Group II); and abnormal establishment of cortical organization (Group III). Many INBORN METABOLIC BRAIN DISORDERS affecting CNS formation are often associated with cortical malformations. They are common causes of EPILEPSY and developmental delay.
Upper central part of the cerebral hemisphere. It is located posterior to central sulcus, anterior to the OCCIPITAL LOBE, and superior to the TEMPORAL LOBES.
The part of the cerebral hemisphere anterior to the central sulcus, and anterior and superior to the lateral sulcus.
A disorder characterized by recurrent partial seizures marked by impairment of cognition. During the seizure the individual may experience a wide variety of psychic phenomenon including formed hallucinations, illusions, deja vu, intense emotional feelings, confusion, and spatial disorientation. Focal motor activity, sensory alterations and AUTOMATISM may also occur. Complex partial seizures often originate from foci in one or both temporal lobes. The etiology may be idiopathic (cryptogenic partial complex epilepsy) or occur as a secondary manifestation of a focal cortical lesion (symptomatic partial complex epilepsy). (From Adams et al., Principles of Neurology, 6th ed, pp317-8)
Sense of awareness of self and of the environment.
Brain waves characterized by a frequency of 4-7 Hz, usually observed in the temporal lobes when the individual is awake, but relaxed and sleepy.
A negative shift of the cortical electrical potentials that increases over time. It is associated with an anticipated response to an expected stimulus and is an electrical event indicative of a state of readiness or expectancy.
A meshlike structure composed of interconnecting nerve cells that are separated at the synaptic junction or joined to one another by cytoplasmic processes. In invertebrates, for example, the nerve net allows nerve impulses to spread over a wide area of the net because synapses can pass information in any direction.
Pathologic conditions affecting the BRAIN, which is composed of the intracranial components of the CENTRAL NERVOUS SYSTEM. This includes (but is not limited to) the CEREBRAL CORTEX; intracranial white matter; BASAL GANGLIA; THALAMUS; HYPOTHALAMUS; BRAIN STEM; and CEREBELLUM.
Adjustment of BRAIN WAVES from two or more neuronal groups within or across a brain structure (e.g., cortical and limbic brain structures) to become uniform in EEG oscillation patterns in response to a stimulus. It is interpreted as a brain integration sign during many processes such as learning, memory, and perception and involves reciprocal neural connections.
Use of sound to elicit a response in the nervous system.
The ability to foresee what is likely to happen on the basis of past experience. It is largely a frontal lobe function.
Focusing on certain aspects of current experience to the exclusion of others. It is the act of heeding or taking notice or concentrating.
Intellectual or mental process whereby an organism obtains knowledge.
Laboratory and other services provided to patients at the bedside. These include diagnostic and laboratory testing using automated information entry.
A profound state of unconsciousness associated with depressed cerebral activity from which the individual cannot be aroused. Coma generally occurs when there is dysfunction or injury involving both cerebral hemispheres or the brain stem RETICULAR FORMATION.
Recording of the changes in electric potential of muscle by means of surface or needle electrodes.
The selecting and organizing of visual stimuli based on the individual's past experience.
The state of being deprived of sleep under experimental conditions, due to life events, or from a wide variety of pathophysiologic causes such as medication effect, chronic illness, psychiatric illness, or sleep disorder.
Tests designed to assess neurological function associated with certain behaviors. They are used in diagnosing brain dysfunction or damage and central nervous system disorders or injury.
Application of computer programs designed to assist the physician in solving a diagnostic problem.
A noninvasive technique that uses the differential absorption properties of hemoglobin and myoglobin to evaluate tissue oxygenation and indirectly can measure regional hemodynamics and blood flow. Near-infrared light (NIR) can propagate through tissues and at particular wavelengths is differentially absorbed by oxygenated vs. deoxygenated forms of hemoglobin and myoglobin. Illumination of intact tissue with NIR allows qualitative assessment of changes in the tissue concentration of these molecules. The analysis is also used to determine body composition.
The storing or preserving of video signals for television to be played back later via a transmitter or receiver. Recordings may be made on magnetic tape or discs (VIDEODISC RECORDING).
Diagnostic, therapeutic, and investigative procedures prescribed and performed by health professionals, the results of which do not justify the benefits or hazards and costs to the patient.
Non-invasive methods of visualizing the CENTRAL NERVOUS SYSTEM, especially the brain, by various imaging modalities.
Cortical vigilance or readiness of tone, presumed to be in response to sensory stimulation via the reticular activating system.
Area of the FRONTAL LOBE concerned with primary motor control located in the dorsal PRECENTRAL GYRUS immediately anterior to the central sulcus. It is comprised of three areas: the primary motor cortex located on the anterior paracentral lobule on the medial surface of the brain; the premotor cortex located anterior to the primary motor cortex; and the supplementary motor area located on the midline surface of the hemisphere anterior to the primary motor cortex.
Lower lateral part of the cerebral hemisphere responsible for auditory, olfactory, and semantic processing. It is located inferior to the lateral fissure and anterior to the OCCIPITAL LOBE.
The process whereby auditory stimuli are selected, organized, and interpreted by the organism.
A statistical analytic technique used with discrete dependent variables, concerned with separating sets of observed values and allocating new values. It is sometimes used instead of regression analysis.
Assessment of sensory and motor responses and reflexes that is used to determine impairment of the nervous system.
The circulation of blood through the BLOOD VESSELS of the BRAIN.
Elements of limited time intervals, contributing to particular results or situations.
A stage of sleep characterized by rapid movements of the eye and low voltage fast pattern EEG. It is usually associated with dreaming.
Localized reduction of blood flow to brain tissue due to arterial obstruction or systemic hypoperfusion. This frequently occurs in conjunction with brain hypoxia (HYPOXIA, BRAIN). Prolonged ischemia is associated with BRAIN INFARCTION.
The upper part of the human body, or the front or upper part of the body of an animal, typically separated from the rest of the body by a neck, and containing the brain, mouth, and sense organs.
Neural tracts connecting one part of the nervous system with another.
A procedure consisting of a sequence of algebraic formulas and/or logical steps to calculate or determine a given task.
The observable response of a man or animal to a situation.
The excision of the thickened, atheromatous tunica intima of a carotid artery.
An infant during the first month after birth.
A statistical technique that isolates and assesses the contributions of categorical independent variables to variation in the mean of a continuous dependent variable.
The statistical reproducibility of measurements (often in a clinical context), including the testing of instrumentation or techniques to obtain reproducible results. The concept includes reproducibility of physiological measurements, which may be used to develop rules to assess probability or prognosis, or response to a stimulus; reproducibility of occurrence of a condition; and reproducibility of experimental results.
Subjectively experienced sensations in the absence of an appropriate stimulus, but which are regarded by the individual as real. They may be of organic origin or associated with MENTAL DISORDERS.
Abnormally low BODY TEMPERATURE that is intentionally induced in warm-blooded animals by artificial means. In humans, mild or moderate hypothermia has been used to reduce tissue damages, particularly after cardiac or spinal cord injuries and during subsequent surgeries.
Analysis based on the mathematical function first formulated by Jean-Baptiste-Joseph Fourier in 1807. The function, known as the Fourier transform, describes the sinusoidal pattern of any fluctuating pattern in the physical world in terms of its amplitude and its phase. It has broad applications in biomedicine, e.g., analysis of the x-ray crystallography data pivotal in identifying the double helical nature of DNA and in analysis of other molecules, including viruses, and the modified back-projection algorithm universally used in computerized tomography imaging, etc. (From Segen, The Dictionary of Modern Medicine, 1992)
The detailed examination of observable activity or behavior associated with the execution or completion of a required function or unit of work.
The act, process, or result of passing from one place or position to another. It differs from LOCOMOTION in that locomotion is restricted to the passing of the whole body from one place to another, while movement encompasses both locomotion but also a change of the position of the whole body or any of its parts. Movement may be used with reference to humans, vertebrate and invertebrate animals, and microorganisms. Differentiate also from MOTOR ACTIVITY, movement associated with behavior.
An element with atomic symbol O, atomic number 8, and atomic weight [15.99903; 15.99977]. It is the most abundant element on earth and essential for respiration.
Remembrance of information for a few seconds to hours.
The measurement of the amplitude of the components of a complex waveform throughout the frequency range of the waveform. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
Dominance of one cerebral hemisphere over the other in cerebral functions.
Binary classification measures to assess test results. Sensitivity or recall rate is the proportion of true positives. Specificity is the probability of correctly determining the absence of a condition. (From Last, Dictionary of Epidemiology, 2d ed)
Application of statistical procedures to analyze specific observed or assumed facts from a particular study.
A method of computed tomography that uses radionuclides which emit a single photon of a given energy. The camera is rotated 180 or 360 degrees around the patient to capture images at multiple positions along the arc. The computer is then used to reconstruct the transaxial, sagittal, and coronal images from the 3-dimensional distribution of radionuclides in the organ. The advantages of SPECT are that it can be used to observe biochemical and physiological processes as well as size and volume of the organ. The disadvantage is that, unlike positron-emission tomography where the positron-electron annihilation results in the emission of 2 photons at 180 degrees from each other, SPECT requires physical collimation to line up the photons, which results in the loss of many available photons and hence degrades the image.
An intravenous anesthetic agent which has the advantage of a very rapid onset after infusion or bolus injection plus a very short recovery period of a couple of minutes. (From Smith and Reynard, Textbook of Pharmacology, 1992, 1st ed, p206). Propofol has been used as ANTICONVULSANTS and ANTIEMETICS.
The physiological mechanisms that govern the rhythmic occurrence of certain biochemical, physiological, and behavioral phenomena.
Paired bodies containing mostly GRAY MATTER and forming part of the lateral wall of the THIRD VENTRICLE of the brain.
Studies used to test etiologic hypotheses in which inferences about an exposure to putative causal factors are derived from data relating to characteristics of persons under study or to events or experiences in their past. The essential feature is that some of the persons under study have the disease or outcome of interest and their characteristics are compared with those of unaffected persons.
Ultrashort-acting anesthetics that are used for induction. Loss of consciousness is rapid and induction is pleasant, but there is no muscle relaxation and reflexes frequently are not reduced adequately. Repeated administration results in accumulation and prolongs the recovery time. Since these agents have little if any analgesic activity, they are seldom used alone except in brief minor procedures. (From AMA Drug Evaluations Annual, 1994, p174)
Drugs used to induce drowsiness or sleep or to reduce psychological excitement or anxiety.
Diseases of the central and peripheral nervous system. This includes disorders of the brain, spinal cord, cranial nerves, peripheral nerves, nerve roots, autonomic nervous system, neuromuscular junction, and muscle.
Acute and chronic (see also BRAIN INJURIES, CHRONIC) injuries to the brain, including the cerebral hemispheres, CEREBELLUM, and BRAIN STEM. Clinical manifestations depend on the nature of injury. Diffuse trauma to the brain is frequently associated with DIFFUSE AXONAL INJURY or COMA, POST-TRAUMATIC. Localized injuries may be associated with NEUROBEHAVIORAL MANIFESTATIONS; HEMIPARESIS, or other focal neurologic deficits.
Surgery performed on the nervous system or its parts.
A severe emotional disorder of psychotic depth characteristically marked by a retreat from reality with delusion formation, HALLUCINATIONS, emotional disharmony, and regressive behavior.
A non-invasive technique using ultrasound for the measurement of cerebrovascular hemodynamics, particularly cerebral blood flow velocity and cerebral collateral flow. With a high-intensity, low-frequency pulse probe, the intracranial arteries may be studied transtemporally, transorbitally, or from below the foramen magnum.
The region of the cerebral cortex that receives the auditory radiation from the MEDIAL GENICULATE BODY.
The tendency of a phenomenon to recur at regular intervals; in biological systems, the recurrence of certain activities (including hormonal, cellular, neural) may be annual, seasonal, monthly, daily, or more frequently (ultradian).
Simultaneous and continuous monitoring of several parameters during sleep to study normal and abnormal sleep. The study includes monitoring of brain waves, to assess sleep stages, and other physiological variables such as breathing, eye movements, and blood oxygen levels which exhibit a disrupted pattern with sleep disturbances.
The electrical response evoked in a muscle or motor nerve by electrical or magnetic stimulation. Common methods of stimulation are by transcranial electrical and TRANSCRANIAL MAGNETIC STIMULATION. It is often used for monitoring during neurosurgery.
The study of systems which respond disproportionately (nonlinearly) to initial conditions or perturbing stimuli. Nonlinear systems may exhibit "chaos" which is classically characterized as sensitive dependence on initial conditions. Chaotic systems, while distinguished from more ordered periodic systems, are not random. When their behavior over time is appropriately displayed (in "phase space"), constraints are evident which are described by "strange attractors". Phase space representations of chaotic systems, or strange attractors, usually reveal fractal (FRACTALS) self-similarity across time scales. Natural, including biological, systems often display nonlinear dynamics and chaos.
In screening and diagnostic tests, the probability that a person with a positive test is a true positive (i.e., has the disease), is referred to as the predictive value of a positive test; whereas, the predictive value of a negative test is the probability that the person with a negative test does not have the disease. Predictive value is related to the sensitivity and specificity of the test.
Area of the OCCIPITAL LOBE concerned with the processing of visual information relayed via VISUAL PATHWAYS.
Computer-based representation of physical systems and phenomena such as chemical processes.
Mental process to visually perceive a critical number of facts (the pattern), such as characters, shapes, displays, or designs.
The rostral part of the frontal lobe, bounded by the inferior precentral fissure in humans, which receives projection fibers from the MEDIODORSAL NUCLEUS OF THE THALAMUS. The prefrontal cortex receives afferent fibers from numerous structures of the DIENCEPHALON; MESENCEPHALON; and LIMBIC SYSTEM as well as cortical afferents of visual, auditory, and somatic origin.
Observation of a population for a sufficient number of persons over a sufficient number of years to generate incidence or mortality rates subsequent to the selection of the study group.
Area of the parietal lobe concerned with receiving sensations such as movement, pain, pressure, position, temperature, touch, and vibration. It lies posterior to the central sulcus.
Disturbances in mental processes related to learning, thinking, reasoning, and judgment.
An imaging technique using compounds labelled with short-lived positron-emitting radionuclides (such as carbon-11, nitrogen-13, oxygen-15 and fluorine-18) to measure cell metabolism. It has been useful in study of soft tissues such as CANCER; CARDIOVASCULAR SYSTEM; and brain. SINGLE-PHOTON EMISSION-COMPUTED TOMOGRAPHY is closely related to positron emission tomography, but uses isotopes with longer half-lives and resolution is lower.
Tomography using x-ray transmission and a computer algorithm to reconstruct the image.
Evaluation undertaken to assess the results or consequences of management and procedures used in combating disease in order to determine the efficacy, effectiveness, safety, and practicability of these interventions in individual cases or series.
The portion of an interactive computer program that issues messages to and receives commands from a user.
A curved elevation of GRAY MATTER extending the entire length of the floor of the TEMPORAL HORN of the LATERAL VENTRICLE (see also TEMPORAL LOBE). The hippocampus proper, subiculum, and DENTATE GYRUS constitute the hippocampal formation. Sometimes authors include the ENTORHINAL CORTEX in the hippocampal formation.
Marked depression appearing in the involution period and characterized by hallucinations, delusions, paranoia, and agitation.
Voluntary or reflex-controlled movements of the eye.
The knowledge or perception that someone or something present has been previously encountered.
Levels within a diagnostic group which are established by various measurement criteria applied to the seriousness of a patient's disorder.
Methods developed to aid in the interpretation of ultrasound, radiographic images, etc., for diagnosis of disease.
Complex mental function having four distinct phases: (1) memorizing or learning, (2) retention, (3) recall, and (4) recognition. Clinically, it is usually subdivided into immediate, recent, and remote memory.
Signals for an action; that specific portion of a perceptual field or pattern of stimuli to which a subject has learned to respond.
Those affective states which can be experienced and have arousing and motivational properties.
The science and art of collecting, summarizing, and analyzing data that are subject to random variation. The term is also applied to the data themselves and to the summarization of the data.
The physical activity of a human or an animal as a behavioral phenomenon.
Studies which start with the identification of persons with a disease of interest and a control (comparison, referent) group without the disease. The relationship of an attribute to the disease is examined by comparing diseased and non-diseased persons with regard to the frequency or levels of the attribute in each group.

Physiological properties of raphe magnus neurons during sleep and waking. (1/10381)

Neurons in the medullary raphe magnus (RM) that are important in the descending modulation of nociceptive transmission are classified by their response to noxious tail heat as ON, OFF, or NEUTRAL cells. Experiments in anesthetized animals demonstrate that RM ON cells facilitate and OFF cells inhibit nociceptive transmission. Yet little is known of the physiology of these cells in the unanesthetized animal. The first aim of the present experiments was to determine whether cells with ON- and OFF-like responses to noxious heat exist in the unanesthetized rat. Second, to determine if RM cells have state-dependent discharge, the activity of RM neurons was recorded during waking and sleeping states. Noxious heat applied during waking and slow wave sleep excited one group of cells (ON-U) in unanesthetized rats. Other cells were inhibited by noxious heat (OFF-U) applied during waking and slow wave sleep states in unanesthetized rats. NEUTRAL-U cells did not respond to noxious thermal stimulation applied during either slow wave sleep or waking. ON-U and OFF-U cells were more likely to respond to noxious heat during slow wave sleep than during waking and were least likely to respond when the animal was eating or drinking. Although RM cells rarely respond to innocuous stimulation applied during anesthesia, ON-U and OFF-U cells were excited and inhibited, respectively, by innocuous somatosensory stimulation in the unanesthetized rat. The spontaneous activity of >90% of the RM neurons recorded in the unanesthetized rat was influenced by behavioral state. OFF-U cells discharged sporadically during waking but were continuously active during slow wave sleep. By contrast, ON-U and NEUTRAL-U cells discharged in bursts during waking and either ceased to discharge entirely or discharged at a low rate during slow wave sleep. We suggest that OFF cell discharge functions to suppress pain-evoked reactions during sleep, whereas ON cell discharge facilitates pain-evoked responses during waking.  (+info)

Effect of psychotropic drugs on caudate spindle in cats. (2/10381)

To ascertain whether neuroleptics act on the caudate nucleus itself, the effects of these compounds as well as other centrally acting drugs were examined in relation to caudate spindle and EEG arousal responses (sciatic nerve stimulation) in gallamine-immobilized cats. Haloperidol and chlorpromazine enhanced the caudate spindle at a dose which had no effect on the EEG arousal response. On the other hand, clozapine and a higher dose of chlorpromazine enhanced the caudate spindle, but depressed the arousal response. High frequency stimulation of the sciatic nerve suppressed the caudate spindle. Pentobarbital, biperiden and diazepam, while depressing the arousal response, caused an enhancement of the caudate spindle. Imipramine at a low dose had no effect on either response, whereas at a high dose this drug enhanced the caudate spindle with concomitant depression of the arousal response. From these results, it may be concluded that the enhancing action on the caudate spindle induced by haloperidol and a low dose of chlorpromazine is due to an increase in susceptibility of the caudate nucleus itself. In addition, it is suggested that depression of the activating system is involved in an appearance of the caudate spindle.  (+info)

Arousal from sleep shortens sympathetic burst latency in humans. (3/10381)

1. Bursts of sympathetic activity in muscle nerves are phase-locked to the cardiac cycle by the sinoaortic baroreflexes. Acoustic arousal from non-rapid eye movement (NREM) sleep reduces the normally invariant interval between the R-wave of the electrocardiogram (ECG) and the peak of the corresponding sympathetic burst; however, the effects of other forms of sleep disruption (i.e. spontaneous arousals and apnoea-induced arousals) on this temporal relationship are unknown. 2. We simultaneously recorded muscle sympathetic nerve activity in the peroneal nerve (intraneural electrodes) and the ECG (surface electrodes) in seven healthy humans and three patients with sleep apnoea syndrome during NREM sleep. 3. In seven subjects, burst latencies were shortened subsequent to spontaneous K complexes (1.297 +/- 0.024 s, mean +/- s. e.m.) and spontaneous arousals (1.268 +/- 0.044 s) compared with latencies during periods of stable NREM sleep (1.369 +/- 0.023 s). In six subjects who demonstrated spontaneous apnoeas during sleep, apnoea per se did not alter burst latency relative to sleep with stable electroencephalogram (EEG) and breathing (1.313 +/- 0.038 vs. 1.342 +/- 0.026 s); however, following apnoea-induced EEG perturbations, burst latencies were reduced (1.214 +/- 0.034 s). 4. Arousal-induced reduction in sympathetic burst latency may reflect a temporary diminution of baroreflex buffering of sympathetic outflow. If so, the magnitude of arterial pressure perturbations during sleep (e.g. those caused by sleep disordered breathing and periodic leg movements) may be augmented by arousal.  (+info)

Overexpression of a Shaker-type potassium channel in mammalian central nervous system dysregulates native potassium channel gene expression. (4/10381)

The nervous system maintains a delicate balance between excitation and inhibition, partly through the complex interplay between voltage-gated sodium and potassium ion channels. Because K+ channel blockade or gene deletion causes hyperexcitability, it is generally assumed that increases in K+ channel gene expression should reduce neuronal network excitability. We have tested this hypothesis by creating a transgenic mouse that expresses a Shaker-type K+ channel gene. Paradoxically, we find that addition of the extra K+ channel gene results in a hyperexcitable rather than a hypoexcitable phenotype. The presence of the transgene leads to a complex deregulation of endogenous Shaker genes in the adult central nervous system as well as an increase in network excitability that includes spontaneous cortical spike and wave discharges and a lower threshold for epileptiform bursting in isolated hippocampal slices. These data suggest that an increase in K+ channel gene dosage leads to dysregulation of normal K+ channel gene expression, and it may underlie a mechanism contributing to the pathogenesis of human aneuploidies such as Down syndrome.  (+info)

Intrapreoptic microinjection of GHRH or its antagonist alters sleep in rats. (5/10381)

Previous reports indicate that growth hormone-releasing hormone (GHRH) is involved in sleep regulation. The site of action mediating the nonrapid eye movement sleep (NREMS)-promoting effects of GHRH is not known, but it is independent from the pituitary. GHRH (0.001, 0. 01, and 0.1 nmol/kg) or a competitive antagonist of GHRH (0.003, 0.3, and 14 nmol/kg) was microinjected into the preoptic area, and the sleep-wake activity was recorded for 23 hr after injection in rats. GHRH elicited dose-dependent increases in the duration and in the intensity of NREMS compared with that in control records after intrapreoptic injection of physiological saline. The antagonist decreased the duration and intensity of NREMS and prolonged sleep latency. Consistent alterations in rapid eye movement sleep (REMS) and in brain temperature were not found. The GHRH antagonist also attenuated the enhancements in NREMS elicited by 3 hr of sleep deprivation. Histological verification of the injection sites showed that the majority of the effective injections were in the preoptic area and the diagonal band of Broca. The results indicate that the preoptic area mediates the sleep-promoting activity of GHRH.  (+info)

EEG surveillance as a means of extending operability in high risk carotid endarterectomy. (6/10381)

Some patients who have transient ischemic attacks are denied operation because severe occlusive lesions in other extra-cranial arteries may be inappropriately interpreted as constituting an unacceptable surgical risk, or because the lesion is so distal as to make its removal hazardous. Failure of endarterectomy is usually due to incomplete removal of the lesion or to thrombosis upon the frayed intima. Such lesions require excellent visualization and meticulous surgical technique -- not always possible with a shunt. Among 130 consecutive carotid endarterectomies performed under general anesthesia, EEG changes consistent with cerebral ischemia appeared in only nine (7%). These patients required a shunt. In 11 patients normal EEG tracings were obtained during endarterectomy despite contralateral carotid occlusion. None of these patients had a neurological deficit. Continuous EEG monitoring is a reliable method of detecting changes in cerebral perfusion, permits a more meticulous endarterectomy in high-lying lesions without a shunt, and extends operability in high risk patients. Angiographical findings may be an unreliable predictor concerning risk of endarterectomy.  (+info)

Intensive care management of stroke patients. (7/10381)

Two hundred eighty patients were admitted to an intensive care stroke unit over a one-year period. Subsequent investigation indicated that only 199 of these patients actually had cerebral ischemic or hemorrhagic lesions, 10 had other cerebrovascular lesions, and the remaining 71 patients had unrelated diseases, predominantly seizures. Detailed analysis of 103 stroke patients revealed an overall incidence of 59% hypertension, and 72% had hypertensive, ischemic or valvular heart disease. Fifty percent of the patients had various cardiac arrhythmias, some of which were responsible for the acute cerebrovascular lesion. Fourteen patients died during the acute phase, 11 from apparently irreversible cerebral selling, mainly due to cerebral hemorrhage. Secondary complications such as pneumonia, pulmonary embolism, pressure sores and urinary infection were almost nonexistent, but beneficial effects on the primary cerebral lesions were more difficult to demonstrate.  (+info)

Subcortical arteriosclerotic encephalopathy (Binswanger's disease). A vascular etiology of dementia. (8/10381)

A 51-yearold man with moderate intermittent hypertension had a rapidly progressive, profound dementia in the absence of significant localizing neurological signs. Postmortem examination disclosed the vascular alterations and diffuse white matter degeneration which characterize subcortical arteriosclerotic encephalopathy (SAE) or Binswanger's disease. The case underscores the need to consider vascular disease as an etiology of dementia -- even in the absence of focal neurological deficit.  (+info)

Objective: We aimed to clarify the patterns of ictal power and phase lag among bilateral hemispheres on scalp electroencephalography (EEG) recorded pre-operatively during epileptic spasms (ESs) and the correlation with the outcomes following corpus callosotomy.Methods: We enrolled 17 patients who underwent corpus callosotomy for ESs before 20 years of age. After corpus callosotomy, seven patients did not experience further ESs (favorable outcome group), and the remaining 10 patients had ongoing ESs (unfavorable outcome group). We used pre-operative scalp EEG data from monopolar montages using the average reference. The relative power spectrum (PS), ictal power laterality (IPL) among the hemispheres, and phase lag, calculated by the cross-power spectrum (CPS) among symmetrical electrodes (i.e., F3 and F4), were analyzed in the EEG data of ESs from 143 pre-operative scalp video-EEG records. Analyses were conducted separately in each frequency band from the delta, theta, alpha, beta, and gamma range. We
Definition : Encephalographs designed for recording the variations of the electric potential caused by the electrical activity of the brain, usually detected on the scalp. These recorders consist of a main unit that includes memory (e.g., strip chart, flash card), signal processors, and a cable that is connected at the distal tip through a head box (amplifying unit) to a set of electrodes. The electrodes are typically placed on a cap or net fixed on the scalp in an array of standardized positions. Intracranial electrodes are used in very specific procedures. The electrodes and leads transmit the bioelectrical signals to a recorder which is capable of storing their characteristics for later display in an amplitude versus time graph (i.e., an electroencephalogram); some recorders can also provide a spectral analysis of the signals using a dedicated firmware. Electroencephalographs (EEGs) are used to help in the diagnosis of neurological diseases (e.g., epilepsy), to assist in localizing tumors and ...
TY - JOUR. T1 - Diagnostic usefulness of linear and nonlinear quantitative EEG analysis in Alzheimers disease. AU - Stam, C J. AU - Jelles, B. AU - Achtereekte, H A. AU - van Birgelen, J H. AU - Slaets, J P. PY - 1996/4. Y1 - 1996/4. N2 - The sensitivity of the EEG in early AD is somewhat limited. In this respect spectral analysis is little better than visual assessment. In this study we address the question whether a new type of EEG analysis derived from chaos theory can improve the sensitivity of the EEG. EEGs were recorded in 15 control subjects and 15 patients with mild AD. The EEG recorded at 02 and 01 during eyes closed and eyes open conditions was subjected to spectral analysis (relative power) and nonlinear analysis (calculation of the correlation dimension D2). AD patients had more relative theta power and impaired reactivity in alpha, delta and theta bands. Also, reactivity of the D2 was impaired in AD subjects. For a specificity of 100%, relative theta power had the highest ...
TY - JOUR. T1 - Resting frontal EEG asymmetry in children. T2 - Meta-analyses of the effects of psychosocial risk factors and associations with internalizing and externalizing behavior. AU - Peltola, Mikko J.. AU - Bakermans-Kranenburg, Marian J.. AU - Alink, Lenneke R.A.. AU - Huffmeijer, Renske. AU - Biro, Szilvia. AU - van Ijzendoorn, Marinus H.. PY - 2014/1/1. Y1 - 2014/1/1. N2 - Asymmetry of frontal cortical electroencephalogram (EEG) activity in children is influenced by the social environment and considered a marker of vulnerability to emotional and behavioral problems. To determine the reliability of these associations, we used meta-analysis to test whether variation in resting frontal EEG asymmetry is consistently associated with (a) having experienced psychosocial risk (e.g., parental depression or maltreatment) and (b) internalizing and externalizing behavior outcomes in children ranging from newborns to adolescents. Three meta-analyses including 38 studies (N=2,523) and 50 pertinent ...
Objective: To examine how the introduction of amplitude-integrated electroencephalography (aEEG) to our neonatal intensive care unit (NICU) influenced clinical practice. Methods: This was a retrospective study examining clinical practice three years
TY - JOUR. T1 - Modeling of intracerebral interictal epileptic discharges. T2 - Evidence for network interactions. AU - Meesters, Stephan. AU - Ossenblok, Pauly. AU - Colon, Albert. AU - Wagner, Louis. AU - Schijns, Olaf. AU - Boon, Paul. AU - Florack, Luc. AU - Fuster, Andrea. PY - 2018/6/1. Y1 - 2018/6/1. KW - Stereo-electroencephalography. KW - Analysis framework. KW - Interictal epileptic discharges. KW - Spatiotemporal network interaction. KW - Epilepsy surgery. KW - TEMPORAL-LOBE EPILEPSY. KW - INDEPENDENT COMPONENT ANALYSIS. KW - EPILEPTOGENIC NETWORKS. KW - SOURCE LOCALIZATION. KW - BLIND SEPARATION. KW - CLUSTER-ANALYSIS. KW - BRAIN NETWORKS. KW - EEG. KW - SIGNALS. KW - SEEG. U2 - 10.1016/j.clinph.2018.03.021. DO - 10.1016/j.clinph.2018.03.021. M3 - Article. VL - 129. SP - 1276. EP - 1290. JO - Clinical Neurophysiology. JF - Clinical Neurophysiology. SN - 1388-2457. IS - 6. ER - ...
To investigate using quantitative EEG the (1) differences between patients with mild cognitive impairment with Lewy bodies (MCI-LB) and MCI with Alzheimers disease (MCI-AD) and (2) its utility as a potential biomarker for early differential diagnosis. We analyzed eyes-closed, resting-state, high-density EEG data from highly phenotyped participants (39 MCI-LB, 36 MCI-AD, and 31 healthy controls). EEG measures included spectral power in different frequency bands (delta, theta, pre-alpha, alpha, and beta), theta/alpha ratio, dominant frequency, and dominant frequency variability. Receiver operating characteristic (ROC) analyses were performed to assess diagnostic accuracy. There was a shift in power from beta and alpha frequency bands towards slower frequencies in the pre-alpha and theta range in MCI-LB compared to healthy controls. Additionally, the dominant frequency was slower in MCI-LB compared to controls. We found significantly increased pre-alpha power, decreased beta power, and slower dominant
Learn more about quantitative electroencephalography (QEEG), also known as brainmapping and neuroimaging provided by Dr. Christopher Fisher.
TY - JOUR. T1 - Does muscle tension reflect arousal? Relationship between electromyographic and electroencephalographic recordings. AU - Hoehn-Saric, Rudolf. AU - Hazlett, Richard L.. AU - Pourmotabbed, Tahere. AU - McLeod, Daniel R.. PY - 1997/5/16. Y1 - 1997/5/16. N2 - Increased muscle tension and heightened arousal are the most consistent finding in patients with anxiety disorders. This study examined the relationship between frontalis and gastrocnemius electromyographic (EMG) and electroencephalographic activity on 14 female generalized anxiety disorder patients and 14 female control subjects. In GAD patients, gastrocnemius but not frontalis EMG was correlated with right but not left hemisphere activity. For the non-anxious subjects, there was a pattern for both β1 and β2 waves to be positively associated with both frontalis and gastrocnemius muscle tension levels. The results, while preliminary, suggest that EMG activity may reflect central nervous system arousal.. AB - Increased muscle ...
Spontaneous fluctuations of ongoing brain activity can be observed across a wide range of states, from sleep and even sedation, anesthesia, and coma over resting wakefulness all the way to effortful mental activity (Fox and Raichle, 2007). The fluctuations are spatially organized into ICNs. Their spatial patterns remain qualitatively robust across the different states but show fine-grained quantitative changes of connectivity (Horovitz et al., 2009; Vanhaudenhuyse et al., 2010). EEG has a longstanding tradition in monitoring and actually defining different brain states but it has also recently been shown to reflect activity fluctuations occurring within a given state as resting wakefulness. Activity in different ICNs, as recorded for instance in resting state fMRI studies, has been tied to power in different EEG frequency bands or even patterns of power across the EEG spectrum (Mantini et al., 2007). Here, we have pursued a hypothesis derived from previous work and focused on slow activity ...
article{1266159, author = {van Mierlo, Pieter and Carrette, Evelien and Hallez, Hans and Vonck, Kristl and Van Roost, Dirk and Boon, Paul and Staelens, Steven}, issn = {1053-8119}, journal = {NEUROIMAGE}, keyword = {DEEP BRAIN-STIMULATION,DIRECTED TRANSFER-FUNCTION,VAGUS NERVE-STIMULATION,TEMPORAL-LOBE EPILEPSY,INFORMATION-FLOW,REFRACTORY EPILEPSY,GRANGER CAUSALITY,FMRI DATA,SPECTRAL-ANALYSIS,EEG ACTIVITY,Functional connectivity pattern,Intracranial electroencephalography,Epilepsy,Time-variant multivariate autoregressive modeling,Adaptive directed transfer function}, language = {eng}, number = {3}, pages = {1122--1133}, title = {Accurate epileptogenic focus localization through time-variant functional connectivity analysis of intracranial electroencephalographic signals}, url = {}, volume = {56}, year = {2011 ...
Objective: To observe and evaluate the efficacy of valproate on electroencephalography and obesity in children with epilepsy. Methods: 109 children w..
In this work, we propose a symmetrical multimodal EEG/fMRI information fusion approach dedicated to the identification of event-related bioelectric and hemodynamic responses. Unlike existing, asymmetrical EEG/fMRI data fusion algorithms, we build a joint EEG/fMRI generative model that explicitly accounts for local coupling/uncoupling of bioelectric and hemodynamic activities, which are supposed to share a common substrate. Under a dedicated assumption of spatio-temporal separability, the spatial profile of the common EEG/fMRI sources is introduced as an unknown hierarchical prior on both markers of cerebral activity. Thereby, a devoted Variational Bayesian (VB) learning scheme is derived to infer common EEG/fMRI sources from a joint EEG/fMRI dataset. This yields an estimate of the common spatial profile, which is built as a trade-off between information extracted from EEG and fMRI datasets. Furthermore, the spatial structure of the EEG/fMRI coupling/uncoupling is learned exclusively from the data. The
Where there is doubt about a diagnosis of epilepsy, or where the type of seizures someone experiences is unclear, video-telemetry can be helpful. This is a test that uses a video camera linked to an EEG machine. The camera will visually record your movements and, at the same time, the EEG machine will record your brainwave pattern. Both the video and EEG are stored on to a computer so that they can be reviewed once the test is finished. The doctor will be able to see any seizures that you may have had, as well as any changes in your EEG at that time. The test is often carried out over a number of days in order to increase the chances of recording one of your seizures.. ...
Differences in the neural systems underlying visual search processes for young (n=17, mean age 19.6+/-1.9) and older (n=22, mean age 68.5+/-6) subjects were investigated combining the Event-Related Potential (ERP) technique with standardized Low-Resolution brain Electromagnetic Tomography (sLORETA) analyses. Behavioral results showed an increase in mean reaction times (RTs) and a reduction in hit rates with age. The ERPs were significantly different between young and older subjects at the P3 component, showing longer latencies and lower amplitudes in older subjects. These ERP results suggest an age-related decline in the intensity and speed of visual processing during visual search that imply a reduction in attentional resources with normal aging. The sLORETA data revealed a significantly reduced neural differentiation in older subjects, who recruited bilateral prefrontal regions in a nonselective manner for the different search arrays. Finally, sLORETA between-group comparisons revealed that relative
Over the next 15 min, during preparation and draping of the patient, the PSA value gradually decreased to 17, and the isoflurane was discontinued. Despite this adjustment, his electroencephalography value remained essentially unchanged. During this time, there were no significant changes in heart rate or blood pressure, and the patient remained normothermic. An arterial blood sample was drawn, the analysis of which revealed a blood glucose concentration of 40 mg/dl, an arterial oxygen tension of 171 mmHg, and an arterial carbon dioxide tension of 32 mmHg. Intravenous dextrose, 12.5 g, was given rapidly. Approximately 2 to 3 min later, his PSA value increased to 48, and his blood glucose concentration was 235 mg/dl. The isoflurane was restarted at 0.2%, while the surgeons continued to prepare and drape the patient. Several minutes prior to incision, the isoflurane was titrated up to 1.9%. The patient tolerated the incision, and the isoflurane was gradually decreased. The patient remained stable ...
a 5 year period Patients with complete 6 and 12 month follow up data were included Analysis was also done across various subgroups including gender age at implantation seizure type abnormal MRI findings pre implantation number of medications at baseline history of SE and duration of epilepsy Results complete follow up data were available for 69 patients Median seizure reduction for these patients was 50 Q1 0 Q3 73 at 6 months and 40 Q1 25 Q3 75 at 12 months When stratified by baseline seizure frequency there was a significant reduction from baseline of 61 at 6 months and 69 at 12 months for patients in the high baseline frequency group There were no significant reductions at month 6 or 12 months for the lower baseline frequency group Adverse events were reported in 40 6 28 out of 69 patients Six patients had the VNS removed for reasons including lack of efficacy and side effects and were excluded from the study group http www ncbi nlm nih gov pubmed 24438620 Comments of reviewer Prof Van ...
A multi-channel instrumentation system is provided wherein signals from selected electrode pairs are sequentially connected to the isolated input of a common signal amplifying path. The electrode pair selecting means is included in a portable head box which may be placed adjacent to the patient to be tested. Included in the head box are facilities for testing the impedance of any selected one of the patient electrodes and providing a visual indication of the magnitude of such impedance. The head box also includes facilities for selecting a group of patient electrodes which are connected together and used as an average or reference potential for one input of the common signal path. Facilities are also provided for calibrating the common signal path by applying a d.c. calibration signal to the input thereof by means isolated from system ground. An improved circuit arrangement is provided for limiting the current which can be drawn from the patient ground electrode to a small value to provide for the
Symptoms of schizophrenia (SCZ) are likely to be generated by genetically mediated synaptic dysfunction, which contribute to large-scale functional neural dysconnectivity. Recent electrophysiological studies suggest that this dysconnectivity is present not only at a spatial level but also at a temporal level, operationalized as long-range temporal correlations (LRTCs). Previous research suggests that alpha and beta frequency bands have weaker temporal stability in people with SCZ. This study sought to replicate these findings with high-density electroencephalography (EEG), enabling a spatially more accurate analysis of LRTC differences, and to test associations with characteristic SCZ symptoms and cognitive deficits. A 128-channel EEG was used to record eyes-open resting state brain activity of 23 people with SCZ and 24 matched healthy controls (HCs). LRTCs were derived for alpha (8-12 Hz) and beta (13-25 Hz) frequency bands. As an exploratory analysis, LRTC was source projected using sLoreta. People
By taking such measures that in the brain wave measurement by a wearable device capable of an acoustic output and in a brain wave interface or in a brain wave monitor, noise derived from an output acoustic signal is estimated and removed from the voltage level obtained at an electrode, brain waves can be used without being affected by the noise. A brain wave measuring device comprises: a brain wave measuring unit for measuring the brain waves of the user by using a plurality of electrodes; an electroacoustic converter disposed in the vicinity of at least one electrode among the plurality of electrodes when the user wears the brain wave measuring unit and presenting an acoustic signal to the user; an amplitude envelope extraction unit for extracting the amplitude envelope of the acoustic signal presented from the electroacoustic converter; a frequency analysis unit for analyzing the frequency of the amplitude envelope extracted by the amplitude envelope extraction unit; and a noise estimation unit
Coppola G, Ambrosini A, Di Clemente L, Magis D, Fumal A, Gérard P, Pierelli F & Schoenen J. Interictal abnormalities of gamma band activity in visual evoked responses in migraine: an indication of thalamocortical dysrhythmia? Cephalalgia 2007; 27:1360-1367. London. ISSN 0333-1024. Between attacks, migraineurs lack habituation in standard visual evoked potentials (VEPs). Visual stimuli also evoke high-frequency oscillations in the gamma band range (GBOs, 20-35 Hz) assumed to be generated both at subcortical (early GBOs) and cortical levels (late GBOs). The consecutive peaks of GBOs were analysed regarding amplitude and habituation in six successive blocks of 100 averaged pattern reversal (PR)-VEPs in healthy volunteers and interictally in migraine with (MA) or without aura patients. Amplitude of the two early GBO components in the first PR-VEP block was significantly increased in MA patients. There was a significant habituation deficit of the late GBO peaks in migraineurs. The increased ...
Changes in conscious level have been associated with changes in dynamical integration and segregation among distributed brain regions. Recent theoretical developments emphasize changes in directed functional (i.e., causal) connectivity as reflected in quantities such as integrated information and causal density. Here we develop and illustrate a rigorous methodology for assessing causal connectivity from electroencephalographic (EEG) signals using Granger causality (GC). Our method addresses the challenges of non-stationarity and bias by dividing data into short segments and applying permutation analysis. We apply the method to EEG data obtained from subjects undergoing propofol-induced anaesthesia, with signals source-localized to the anterior and posterior cingulate cortices. We found significant increases in bidirectional GC in most subjects during loss-of-consciousness, especially in the beta and gamma frequency ranges. Corroborating a previous analysis we also found increases in synchrony in
Gratuit Science of brain wave technology for intellectual ... Neurofeedback is a form of training that monitors your brain waves and trains you to control them. Providers claim it makes you smarter and more creative. Brain Wave 32 Advanced Binaural Brainwave Entrainment ... Read reviews, compare customer ratings, see screenshots, and learn more about Brain Wave 32 Advanced Binaural Brainwave Entrainment Programs with ... Electroencephalography Wikipedia Electroencephalography (EEG) is an electrophysiological monitoring method to record electrical activity of the brain. It is typically noninvasive, with the electrodes ... Brain Waves Binaural Beats Android Apps on Google Play With this app you can easily generate pure waves that will stimulate your concentration, meditation or relaxation. Very Important Use headphones for a ... Alpha Brain Waves Boost Creativity and Reduce Depression ... Neuroscientists recently made a correlation between an increase of alpha brain waveseither through electrical ...
Anatomical functionality is a major topic in brain research. Numerous investigations have shown task dependent activation of focal brain areas, with most information based on time-averaged data due to methodological limitations. Ultra-fast quantitative EEG, especially in the newly developed combination with eye tracking (EnkephaloVision), is very suitable to follow activities of local electric circuits. This investigation in 57 subjects revealed transient focal frequency changes reaching up to more than 6000% of global median spectra power during cognitive and emotional challenges at frontal electrode positions. Recording epochs of 364 ms uncovered coherences with respect to focal brain areas and single frequencies, which are typically lost during averaged calculations. When averaging data over a whole scene, a least demanding challenge like viewing a boring animal video only activated the lateral frontal lobe, whereas solving brain-teasers and performance of mathematical calculations led to delta
Inclusion Criteria:. AD Cohort:. Subjects between 60 and 90 years old meeting NINCDS-ADRDA criteria for probable AD2 and DSM-IV criteria for dementia of the Alzheimers type3 will be recruited in the AD cohort (MMSE ≥21, ≤26).. Memory complaint by subject and/or study partner SRP-1418 N Page: 8 of 26. Abnormal memory function score on Logical Memory II subscale (Delayed Paragraph Recall) from the Wechsler Memory Scale - Revised (adjusted for education. Maximum score is 25):. i. , 10 for 16 or more years of education ii. , 6 for 8-15 years of education iii. , 4 for 0-7 years of education Clinical Dementia Rating (CDR) = 0.5, 1.0 or 2.0 Modified Hachinski Ischemic Scale (HIS) ≤ 4 Geriatric Depression Scale (GDS) , 6 For subjects that decide to provide a CSF sample: Platelet count ≥ 100,000/μL, Prothrombin Time (PT) = 11 to 16 seconds, International Normalized Ratio = 0.8 to 1.2 Study partner or caregiver to accompany subject to all scheduled visits Fluent in English Adequate visual acuity ...
Inclusion Criteria:. AD Cohort:. Subjects between 60 and 90 years old meeting NINCDS-ADRDA criteria for probable AD2 and DSM-IV criteria for dementia of the Alzheimers type3 will be recruited in the AD cohort (MMSE ≥21, ≤26).. Memory complaint by subject and/or study partner SRP-1418 N Page: 8 of 26. Abnormal memory function score on Logical Memory II subscale (Delayed Paragraph Recall) from the Wechsler Memory Scale - Revised (adjusted for education. Maximum score is 25):. i. , 10 for 16 or more years of education ii. , 6 for 8-15 years of education iii. , 4 for 0-7 years of education Clinical Dementia Rating (CDR) = 0.5, 1.0 or 2.0 Modified Hachinski Ischemic Scale (HIS) ≤ 4 Geriatric Depression Scale (GDS) , 6 For subjects that decide to provide a CSF sample: Platelet count ≥ 100,000/μL, Prothrombin Time (PT) = 11 to 16 seconds, International Normalized Ratio = 0.8 to 1.2 Study partner or caregiver to accompany subject to all scheduled visits Fluent in English Adequate visual acuity ...
Objective The significant impact of stroke on health care results in an unmet need for efficient stroke care in resources limited environments. Practical, inexpensive and easy to obtain predictive EEG parameters have been suggested in anterior circulation syndromes. We investigated whether EEG parameters are of additional predictive value with regard to lesion volume and short-term functional outcome in lacunar (LACS) and posterior circulation (POCS) syndromes of presumed ischemic origin. Methods Sixty (60) patients presenting with LACS or POCS were incrementally included. EEG parameters were correlated with volume of ischemia and functional status. Predictive values for definite stroke and unfavourable outcome were calculated using receiver operating characteristic (ROC) curves and logistic regression modelling. Results The pairwise derived brain symmetry index (pdBSI) emerged as independent predictor for definite stroke in patients presenting with LACS and POCS (odds ratio (OR) 2.69, 95% ...
You really can get on the same wavelength as someone else: In a new study, the brain waves of high school students synced up when they were highly engaged during a biology class.. On 11 days over the course of one semester, researchers hooked up all 12 of the students in a biology class to portable devices called electroencephalograms (EEGs) that measured their brain waves. The more synced up a students brain waves were with the brain waves of the rest of the students in the class, the more likely that person was to say that he or she enjoyed the class that day, according to the study, published today (April 27) in the journal Current Biology. For example, when the researchers analyzed brain waves called alpha waves, they found that students waves were more likely to rise and fall at the same time as other students waves when they were highly engaged in the class.. Likewise, when a students brain waves were less synced with those of the rest of the class, the student was less likely to say ...
The seventh part of this book deals with possible neurophysiological mechanisms involved in motor synergies. It starts with a discussion of the structure-function controversy in neurophysiology. Then, it presents reviews of the literature on the role in synergy formation of different structures within the central nervous system such as the spinal cord, the cerebellum, the basal ganglia, and the cortex of the large hemispheres. The review covers animal studies, studies of patients with different neurological disorders, and studies of healthy persons. Studies using transcranial magnetic stimulation are reviewed with respect to the equilibrium-point hypothesis of movement control. Relations between neuronal population vectors and performance variables are discussed. There is one more Digression in this part addressing the issue of localization of functions within brain structures.
Creutzfeldt, O. D. (1979) Neurophysiological Mechanisms and Consciousness, in Ciba Foundation Symposium 69 - Brain and Mind (eds G. E. W. Wolstenholme and M. OConnor), John Wiley & Sons, Ltd., Chichester, UK. doi: 10.1002/9780470720523.ch12 ...
QEEG is a comprehensive diagnostic tool to measure brain activity for ADHD and a range of treatment areas, available in Melbourne.
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AbstractPROLONGED multichannel electroencephalographic (EEG) recordings are required for the evaluation of an epilepsy surgery candidate in order to define precisely the epileptogenic areas, the patients suitability for surgical treatment, and the extent of a proposed resection. An adequate sample of ictal and interictal EEG abnormalities must be obtained to make these important clinical decisions. The minimal monitoring period required to obtain the sample varies from patient to patient, but should be as short as possible.Minimizing the time away from home is especially important when recording from pediatric patients. Children do not understand the importance of the diagnostic test, may be less patient in a restricted and boring setting, and are more likely to interfere with the apparatus. Nevertheless, a positive diagnosis and definite classification are more important at this stage of life than at any other. In patients of any age requiring intensive inpatient EEG monitoring, a computer system can
The leading reference on electroencephalography since 1982, Niedermeyers Electroencephalography is now in its thoroughly updated sixth edition.
Normal frequencies of the human brain associated states are shown below. These frequencies can be picked up by an EEG (Electroencephalogram) from the surface of the brain, after their amplification, as they are in the range of micro-volts. A mixture of these frequencies is present at any given time. Quantitative Electroencephalography (QEEG) is an extension of the analysis of the visual EEG interpretation which may assist and even augment our understanding of the EEG and brain function. QEEG is a procedure that processes the recorded EEG activity from a multi-electrode recording using a computer and converts it into a brain map showing different brain waves ...
The optimal performance of an action depends to a great extend on the ability of a person to prepare in advance the appropriate kinetic and kinematic parameters at a specific point in time in order to meet the demands of a given situation and to foresee its consequences to the surrounding environment. In the research presented in this thesis, I employed high-density electroencephalography in order to study the neural processes underlying preparation for action. A typical way for studying preparation for action in neuroscience is to divide it in temporal preparation (when to respond) and event preparation (what response to make). In Chapter 2, we identified electrophysiological signs of implicit temporal preparation in a task where such preparation was not essential for the performance of the task. Electrophysiological traces of implicit timing were found in lateral premotor, parietal as well as occipital cortices. In Chapter 3, explicit temporal preparation was assessed by comparing anticipatory ...
Young adult (N = 96) university students who varied in their binge drinking history were assessed by electroencephalography (EEG) recording during passive viewing. Groups consisted of male and female non-binge drinkers (|1 to 5/4 drinks/ounces in under two hours), low-binge drinkers (5/4-7/6 drinks/ounces in under two hours), and high-binge drinkers (≥ 10 drinks/ounces in under two hours), who had been drinking alcohol at their respective levels for an average of 3 years. The non- and low-binge drinkers exhibited less spectral power than the high-binge drinkers in the delta (0-4 Hz) and fast-beta (20-35 Hz) bands. Binge drinking appears to be associated with a specific pattern of brain electrical activity in young adults that may reflect the future development of alcoholism.
1)From neurophysiology to neuroimaging: In neurophysiology, neural oscillation is usually well recorded as local field potentials (LFPs). It represents the summation of postsynaptic potentials occurring in the cortical layers. From clinical point of view, clinical EEG in the 20th century used to record rather limited range of frequency activity from delta to gamma activity but did not exceed down to < 1Hz or up to > 100Hz. With much higher sampling rate of > 1K or 2K Hz in the digital EEG equipment, high frequency activity such as ripple or fast ripple activity are well recorded not only by microelectrodes (Le Van Quyen et al, 2008) but also by macroelectrode such as subdural or depth electrode in humans. It could represent the synchronous action potential firing of a group of principal cells (Jefferys et al, 2012). By opening low frequency filter of AC amplifier down to 10 sec, it could also record very slow shifts or baseline shifts. By means of functional MRI (fMRI) in human brain function, ...
Author(s): Rabinoff, M; Kitchen, CMR; Cook, IA; Leuchter, AF | Abstract: The study objective was to evaluate the usefulness of Classification and Regression Trees (CART), to classify clinical responders to antidepressant and placebo treatment, utilizing symptom severity and quantitative EEG (QEEG) data. Patients included 51 adults with unipolar depression who completed treatment trials using either fluoxetine, venlafaxine or placebo. Hamilton Depression Rating Scale (HAM-D) and single electrodes data were recorded at baseline, 2, 7, 14, 28 and 56 days. Patients were classified as medication and placebo responders or non-responders. CART analysis of HAM-D scores showed that patients with HAM-D scores lower than 13 by day 7 were more likely to be treatment responders to fluoxetine or venlafaxine compared to non-responders (p=0.001). Youdens index γ revealed that CART models using QEEG measures were more accurate than HAM-D-based models. For patients given fluoxetine, patients with a decrease at day 2 in
The signal averaging approach typically used in ERP research assumes that peaks in ERP waveforms reflect neural activity that is uncorrelated with activity in the ongoing EEG. However, this assumption has been challenged by research suggesting that ERP peaks reflect event-related synchronization of ongoing EEG oscillations. In this study, we investigated the validity of a set of methods that have been used to demonstrate that particular ERP peaks result from synchronized EEG oscillations. We simulated epochs of EEG data by superimposing phasic peaks on noise characterized by the power spectrum of the EEG. When applied to the simulated data, the methods in question produced results that have previously been interpreted as evidence of synchronized oscillations, even though no such synchrony was present. These findings suggest that proposed analysis methods may not effectively disambiguate competing views of ERP generation.
Besides the benefit of combining electroencephalography (EEG) and magnetic resonance imaging (MRI), much effort has been spent to develop algorithms aimed at successfully cleaning the EEG data from MRI-related gradient and ballistocardiological artifacts. However, there are also studies showing a negative influence of the EEG on MRI data quality. Therefore, in the present study, we focused for the first time on the influence of the EEG on morphometric measurements of T1-weighted MRI data (voxel- and surfaced-based morphometry). Here, we demonstrate a strong influence of the EEG on cortical thickness, surface area, and volume as well as subcortical volumes due to local EEG-related inhomogeneities of the static magnetic (B0) and the gradient field (B1). In a second step, we analyzed the signal-to-noise ratios for both the anatomical and the functional data when recorded simultaneously with EEG and MRI and compared them to the ratios of the MRI data without simultaneous EEG measurements. These ...
In this work we consider hidden signs (biomarkers) in ongoing EEG activity expressing epileptic tendency, for otherwise normal brain operation. More specifically, this study considers children with controlled epilepsy where only a few seizures without complications were noted before starting medication and who showed no clinical or electrophysiological signs of brain dysfunction. We compare EEG recordings from controlled epileptic children with age-matched control children under two different operations, an eyes closed rest condition and a mathematical task. The aim of this study is to develop reliable techniques for the extraction of biomarkers from EEG that indicate the presence of minor neurophysiological signs in cases where no clinical or significant EEG abnormalities are observed. We compare two different approaches for localizing activity differences and retrieving relevant information for classifying the two groups. The first approach focuses on power spectrum analysis whereas the second
Brain waves, or the EEG, are electrical signals that can be recorded from the brain, either directly or through the scalp. The kind of brain wave recorded depends on the behavior of the animal, and is the visible evidence of the kind of neuronal (brain cell) processing necessary for that behavior.. We are working on fast brain waves, at about 40 cycles per second (Hz), which are known as gamma band. Gamma rhythms appear to be involved in higher mental activity, including perception and consciousness. It seems to be associated with consciousness, eg it disappears with general anesthesia.. Synchronous activity at about 40Hz appears to be involved in binding sensory inputs into the single, unitary object we perceive. This process is so efficient, we are hardly aware that it goes on at all. Recordings of neurons in visual cortex show that synchronization at about 40 Hz links parts of the cortex excited by the same object, and not those excited by different objects, implicating in gamma rhythms in ...
TY - JOUR. T1 - Employing neuronal networks to investigate the pathophysiological basis of abnormal cortical oscillations in Alzheimers disease.. AU - Abuhassan, Kamal. AU - Coyle, DH. AU - Maguire, LP. PY - 2011. Y1 - 2011. N2 - This paper describes an investigation into the pathophysiological causes of abnormal cortical oscillations in Alzheimers disease (AD) using two heterogeneous neuronal network models. The effect of excitatory circuit disruption on the beta band power (13-30 Hz) using a conductance-based network model of 200 neurons is assessed. Then, the neural correlates of abnormal cortical oscillations in different frequency bands based on a larger network model of 1000 neurons consisting of different types of cortical neurons is also analyzed. The results show that, despite the heterogeneity of the network models, the beta band power is significantly affected by excitatory neural and synaptic loss. Secondly, the results of modeling a functional impairment in the excitatory circuit ...
A number of recent studies have hypothesized that monitoring in speech production may occur via domain-general mechanisms responsible for the detection of response conflict. Outside of language, two ERP components have consistently been elicited in conflict-inducing tasks (e.g., the flanker task): the stimulus-locked N2 on correct trials, and the response-locked error-related negativity (ERN). The present investigation used these electrophysiological markers to test whether a common response conflict monitor is responsible for monitoring in speech and non-speech tasks. Electroencephalography (EEG) was recorded while participants performed a tongue twister (TT) task and a manual version of the flanker task. In the TT task, people rapidly read sequences of four nonwords arranged in TT and non-TT patterns three times. In the flanker task, people responded with a left/right button press to a center-facing arrow, and conflict was manipulated by the congruency of the flanking arrows. Behavioral ...
A number of recent studies have hypothesized that monitoring in speech production may occur via domain-general mechanisms responsible for the detection of response conflict. Outside of language, two ERP components have consistently been elicited in conflict-inducing tasks (e.g., the flanker task): the stimulus-locked N2 on correct trials, and the response-locked error-related negativity (ERN). The present investigation used these electrophysiological markers to test whether a common response conflict monitor is responsible for monitoring in speech and non-speech tasks. Electroencephalography (EEG) was recorded while participants performed a tongue twister (TT) task and a manual version of the flanker task. In the TT task, people rapidly read sequences of four nonwords arranged in TT and non-TT patterns three times. In the flanker task, people responded with a left/right button press to a center-facing arrow, and conflict was manipulated by the congruency of the flanking arrows. Behavioral ...
What is the purpose of the test?. An electroencephalogram (EEG) is a test used to find problems related to electrical activity of the brain. An EEG tracks and records brain wave patterns. Small metal discs with thin wires (electrodes) are placed on the scalp, and then send signals to a computer to record the results.. What is the test about?. Electroencephalography (EEG) is a neurophysiology test which analyses the electrical activity generated by the brain. Special sensors (metal disc electrodes) are attached onto the head and hooked by wires to a computer. Common reasons for referral include:. Seizures. Encephalopathies (disease of the brain). EEG can also be performed as part of the investigations of some patients with syncope. Syncope, also known as fainting in medical terms, is defined as a transient loss of consciousness and postural tone, characterised by rapid onset, short duration and spontaneous recovery due to low blood flow to the brain usually because of low blood pressure. ...
Monitoring of spontaneous brain electrical activity (EEG) has three purposes: Detecting sudden loss of background activity as an early sign of brain hypoxia/ischaemia, detection of silent seizures, and helping to diagnose brain damage. Tape-recording allows storage of upto 8 channels of standard EEG …
This course provides an overview for the indications and methodology of cEEG (Continuous Electroencephalography) monitoring in the ICU, and discusses the role of some quantitative EEG (Electroencephalography) analysis techniques. Clinical examples of cEEG use, including monitoring of status epileptics, assessment of ongoing therapy for treatment of seizures in critically ill patients, and monitoring for cerebral ischemia, are presented and discussed.. ...
EEG electrode is a medical device that is used for recording the electrical activity of the brain. Technavios EEG electrodes market analysis considers sales from the adoption of disposable EEG electrodes and reusable EEG electrodes. Our analysis also considers the sales of EEG electrodes in Asia, Europe, North America, and ROW. In 2018, the disposable EEG electrodes segment had a significant market share, and this trend is expected to continue over the forecast period. The benefits of using disposable EEG electrodes including improved safety profile and reduced prices will play a significant role in the disposable EEG electrodes segment to maintain its market position. Also, our global EEG electrodes market report looks at factors such as the increasing prevalence of neurological disorders, rising demand for EEG procedures, and increasing initiatives and support from governments and healthcare organizations. However, high cost of EEG devices and procedures, shortage of skilled professionals, ...
The mechanism of tinnitus suppression after cochlear implantation (CI) in single-sided deafness (SSD) is not fully understood. In this regard, by comparing pre-and post-CI quantitative electroencephalography (qEEG), we explored cortical changes relevant to tinnitus improvement. In SSD patients who underwent CI, qEEG data were collected: (1) before CI, (2) 6 months post-operatively with CI-on, and (3) 30 min after CI-off and source-localized cortical activity/functional connectivity analyses were performed. Compared to the pre-operative baseline, the CI-on condition demonstrated significantly decreased activity in the right auditory-and orbitofrontal cortices (OFC) for the delta frequency band as well as decreased connectivity between the auditory cortex/posterior cingulate cortex for the delta/beta2 bands. Meanwhile, compared to the CI-off condition, the CI-on condition displayed decreased activity in the right auditory cortices/OFC for the delta band, and in bilateral auditory cortices, left ...
TY - JOUR. T1 - Alteration of frontal EEG asymmetry during tryptophan depletion predicts future depression. AU - Allen, John J.B.. AU - McKnight, Katherine M.. AU - Moreno, Francisco A.. AU - Demaree, Heath A.. AU - Delgado, Pedro L.. PY - 2009/5/1. Y1 - 2009/5/1. N2 - Background: Tryptophan depletion (TD) reduces brain serotonin and may induce acute depressive symptomatology, especially among those with a history of Major Depression. Depressive response to TD among euthymic patients with a history of depression also predicts future depression. Better prediction might result by assessing a putative endophenotype for depressive risk, frontal electroencephalographic (EEG) asymmetry, in the context of TD. Method: Nine euthymic history-positive participants and nine controls were administered TD. Symptomatic and EEG frontal asymmetry data were collected for 6 h following TD, and clinical status was followed for the next 12 months. Results: The magnitude of TD-induced change in frontal EEG asymmetry ...
in Archives Italiennes de Biologie (2012), 150(2-3), 122-39. Electroencephalographic activity in the context of disorders of consciousness is a swiss knife like tool that can evaluate different aspects of cognitive residual function, detect consciousness and ... [more ▼]. Electroencephalographic activity in the context of disorders of consciousness is a swiss knife like tool that can evaluate different aspects of cognitive residual function, detect consciousness and provide a mean to communicate with the outside world without using muscular channels. Standard recordings in the neurological department offer a first global view of the electrogenesis of a patient and can spot abnormal epileptiform activity and therefore guide treatment. Although visual patterns have a prognosis value, they are not sufficient to provide a diagnosis between vegetative state/unresponsive wakefulness syndrome (VS/UWS) and minimally conscious state (MCS) patients. Quantitative electroencephalography (qEEG) processes ...
This book is designed to meet the need for a practically oriented textbook on the rapidly growing field of continuous EEG (cEEG) monitoring. A wide range of key clinical aspects are addressed, with explanation of status epilepticus classification, criteria for institution of monitoring, seizure patterns and their recognition, quantitative EEG analysis, and neuroimaging in patients undergoing cEEG monitoring. The value of cEEG and the nature of cEEG findings in various special situations are then reviewed, covering particular pathologies, critical care considerations, and prognostication. Treatments of nonconvulsive status epilepticus (NCSE) and nonconvulsive seizures (NCS) are discussed. The concluding section is devoted to important administrative issues including billing, staffing issues, comparison of EEG machines, and information technology (IT) issues ...
The anti-anxiety effects of L-theanine are mediated through different mechanisms including enhanced alpha brain wave activity, increased synthesis of GABA, and its role as a weak antagonist of AMPA glutamate receptors. General calming benefits of l-theanine are reflected in increased brain electrical activity in the alpha frequency range (8 to 13 Hz). Changes in brain electrical activity measured by electroencephalography (EEG) are dose-dependent, and are similar to beneficial EEG changes observed in meditation, including increased alpha waves in the occipital and parietal regions. Increased alpha activity has been shown to continue for 60 minutes following administration of a 200mg dose of l-theanine, and this effect was more marked in individuals with higher trait anxiety. Finally, ingestion of green tea with high l-theanine content has been found to decrease adrenal hypertrophy in mice exposed to chronic stress. Individuals who drink green tea for stress or anxiety may experience greater ...
TY - JOUR. T1 - Sleep spindles in human prefrontal cortex. T2 - An electrocorticographic study. AU - Nakamura, Motoaki. AU - Uchida, Sunao. AU - Maehara, Taketoshi. AU - Kawai, Kensuke. AU - Hirai, Nobuhide. AU - Nakabayashi, Tetsuo. AU - Arakaki, Hiroshi. AU - Okubo, Yoshiro. AU - Nishikawa, Toru. AU - Shimizu, Hiroyuki. PY - 2003/4/1. Y1 - 2003/4/1. N2 - To investigate the sleep spindle activity of the human prefrontal cortex (PFC), we simultaneously recorded whole nights of polysomnographic and electrocorticographic (ECoG) activities during the natural sleep of epileptic patients. Subjects were nine patients with intractable epilepsy who had subdural electrodes surgically attached to the orbital (seven cases), medial (three cases), or dorsolateral (two cases) PFC, and in one case to the frontal pole. To examine spindle frequencies, fast Fourier transformation (FFT) and auto-correlation analyses were performed on the PFC ECoG and Cz EEG data, primarily on epochs of stage 2 sleep. Lower sigma ...
臺大位居世界頂尖大學之列,為永久珍藏及向國際展現本校豐碩的研究成果及學術能量,圖書館整合機構典藏(NTUR)與學術庫(AH)不同功能平台,成為臺大學術典藏NTU scholars。期能整合研究能量、促進交流合作、保存學術產出、推廣研究成果。. To permanently archive and promote researcher profiles and scholarly works, Library integrates the services of NTU Repository with Academic Hub to form NTU Scholars.. ...
Author(s): Weiss, Shennan A; Orosz, Iren; Salamon, Noriko; Moy, Stephanie; Wei, Linqing; Vant Klooster, Maryse A; Knight, Robert T; Harper, Ronald M; Bragin, Anatol; Fried, Itzhak; Engel, Jerome; Staba, Richard J | Abstract: Ripples (80-150 Hz) recorded from clinical macroelectrodes have been shown to be an accurate biomarker of epileptogenic brain tissue. We investigated coupling between epileptiform spike phase and ripple amplitude to better understand the mechanisms that generate this type of pathologic ripple (pRipple) event.We quantified phase amplitude coupling (PAC) between epileptiform electroencephalography (EEG) spike phase and ripple amplitude recorded from intracranial depth macroelectrodes during episodes of sleep in 12 patients with mesial temporal lobe epilepsy. PAC was determined by (1) a phasor transform that corresponds to the strength and rate of ripples coupled with spikes, and a (2) ripple-triggered average to measure the strength, morphology, and spectral frequency of the
Brain computer interfaces (BCIs) provide a non-muscular avenue for the user to communicatewith others and to control external devices. Over the last two decades BCIs have been developed to assist the severely motor-disabled people, such as traumatic braininjury, stroke, or amyotrophic lateral sclerosis. Electroencephalography (EEG) is one of the most popular noninvasive BCI approaches. The inputs to EEG-based BCIs are event-related potentials (ERPs), which are neural signatures representing the responses to an external stimulus. Traditional BCI systems, which have had some success, make inferences based on trial-averaged ERPs, where each trial consists of one stimulus. In this thesis, (1) we develop a single-trial, EEG-based BCI to increase the throughput of visual image search and (2) we unveil a neural correlate of human visual perception that occurs in rapid visual-recognition tasks. Our first task is to develop a BCI. Our BCI makes inferences from single-trial ERPs; hence, it is more efficient than
TY - JOUR. T1 - MODIFICAZIONI EEG IN CORSO DI TRATTAMENTO CON VALPROATO SODICO IN PAZIENTI CON EPILESSIA GENERALIZZATA IDIOPATICA. AU - Maschio, M. C E. AU - Spanedda, F.. AU - Gigli, G. L.. AU - Marciani, M. G.. PY - 1993. Y1 - 1993. N2 - We studied in a population of 16 patients with idiopathic generalized epilepsy, the effects of sodium valproate on EEG background activity, on ictal and interictal epileptiform abnormalities and on seizures occurrence. Our data demonstrated that VPA is a drug which seems to not modify the EEG background activity and not to alter the mental processes. In additional, although it reduced the seizures frequency, does not influence the level of IEA.. AB - We studied in a population of 16 patients with idiopathic generalized epilepsy, the effects of sodium valproate on EEG background activity, on ictal and interictal epileptiform abnormalities and on seizures occurrence. Our data demonstrated that VPA is a drug which seems to not modify the EEG background activity ...
All experiments were conducted between 9 and 19 h. The experimental design of this study is illustrated in figure 1A. On the day of the experiment, anesthesia was initially induced in a chamber using 4-5% isoflurane (vaporizer setting) in 100% oxygen (2 l/min). After loss of the righting reflex (LORR) and evaluation of changes in respiratory rate, the animals were exposed to 1, 1.4, or 2.1% isoflurane (with 100% oxygen, flow rate 1 l/min) via a facemask connected to a scavenging system. The isoflurane vaporizer was used throughout the study, and stability of output over time was verified by an infrared gas analyzer. The 1%, 1.4%, and 2.1% isoflurane were considered to be the minimum alveolar concentration values of 0.7, 1.0, and 1.5, respectively, in rats.22 Body temperature was determined rectally and maintained at 37.0-37.5°C with a heating lamp. In Experiment 1, a 30-gauge injection cannula was introduced through the guide cannula into the NBM after a 30-min equilibration period with 1.4% ...
The physiopathological mechanism underlying the tinnitus phenomenon is still the subject of an ongoing debate. Since oscillatory EEG activity is increasingly recognized as a fundamental hallmark of cortical integrative functions, this study investigates deviations from the norm of different resting EEG parameters in patients suffering from chronic tinnitus. Spectral parameters of resting EEG of male tinnitus patients (n = 8, mean age 54 years) were compared to those of age-matched healthy males (n = 15, mean age 58.8 years). On average, the patient group exhibited higher spectral power over the frequency range of 2-100 Hz. Using LORETA source analysis, the generators of delta, theta, alpha and beta power increases were localized dominantly to left auditory (Brodmann Areas (BA) 41,42, 22), temporo-parietal, insular posterior, cingulate anterior and parahippocampal cortical areas. Tinnitus patients show a deviation from the norm of different resting EEG parameters, characterized by an overproduction of
Title:Interference with processed electroencephalographic recording by facial nerve stimulation.,Author:Artru A A,Chadwick H S,Colley P S,Momii S,Journal:Anesthesiology,1983/12;59(6):595-6.,Publicatio...
Epilepsy is a neurological disorder affecting almost 1 % of humans on earth [1, 2]. This disease is characterized by repetitive seizures, shown by loss of muscle control, mental or conscious deficiency etc. Epileptic seizures are generally caused by brusque and ephemeral electrical discharges of synchronous association of brain cells [3]. Electroencephalography (EEG) defined as the recording of electrical brain activities by means of a set of electrodes directly placed on the scalp, can easily exhibit these electrical discharges. Hence it becomes evident that neurologists and other practioners would rely on the EEG recordings to explore possible epileptic seizures [3-7]. However, visual scanning of EEG records is a subjective process and would result in many different misinterpretations; it is considered as time consuming as records could persist for hours or even several days. Thus, computational methods would be necessary to realize automatic detection and classification of epileptic patterns ...
PURPOSE: Generalized paroxysmal fast activity (GPFA) is a diffuse, paroxysmal, frontal predominant activity described in patients with generalized epilepsies. Studies specifically focusing on electroclinical features of typical absence seizures in children have not reported any GPFA-like features. We sought to identify GPFA in children with typical absence seizures, study its incidence, characteristic electroclinical features, and effect on their epilepsy. METHODS: We performed a retrospective review of electroencephalograms of children with diagnosis of absence epilepsy. A total of 173 subjects were identified. In subjects with GPFA on their electroencephalograms, GPFA characteristics were collected (i.e., predominant location, duration, amplitude, frequency, provocation factors, and if GPFA was followed by spike-wave discharges). In GPFA-positive subjects, further data sets were collected examining their demographics, duration of epilepsy, and pharmacoresponsiveness to epilepsy. RESULTS: Generalized
Elia et al. described the clinical and electroencephalographic features of three boys with CDKL5 mutations. [1] They concluded that, similarly to girls with this mutation, epilepsy appears to be polymorphous, with myoclonic, tonic, and partial seizures or spasms and that interictal EEG pattern is characterized by focal, multifocal, diffuse pseudoperiodic epileptiform activity. Elia considered these clinical and electroencephalographic observations similar to other findings. [2-3] However, the EEG pattern reported by Elia et al. was actually first described by us. [4] We described the seizures of three CDKL5 patients as starting as complex partial seizures or tonic spasms and then becoming complex partial, tonic, and unexpectedly, myoclonic seizures of such prominence to justify the definition of myoclonic encephalopathy. In this stage, the EEG showed an intercritical pattern with pseudoperiodic, diffuse sharp waves or pseudoperiodic, diffuse spike and polyspike and wave discharges and ...
Headline: Bitcoin & Blockchain Searches Exceed Trump! Blockchain Stocks Are Next!. Electroencephalography Equipment Market analysis is provided for global market including development trends by regions, competitive analysis of the Electroencephalography Equipment market. EEG, the bodys own brain generated by the weak creatures in the scalp at the collection, and enlarge the record and get the curve graph. The electroencephalogram measures voltage fluctuations from ion currents in neurons in the brain and is used to aid in the diagnosis of brain-related diseases.. Browse more detail information about Electroencephalography Equipment market report at: Market Segment by Manufacturers, this report covers. ...
A preference for organization is associated with several disorders, but is widespread in the general population as well. It remains unclear whether organization and various degrees of disorganization elicit pleasant or unpleasant feelings (i.e., valence), calming or arousing feelings (i.e., arousal), and a frontal negativity in the event-related potential (ERP) related to cognitive control. This study tested how organization, slight disorganization, and total disorganization affect valence, arousal, and the frontal negativity. Participants passively viewed organized, slightly disorganized, totally disorganized, and control pictures while their electroencephalogram was recorded. They also rated the valence and arousal elicited by each picture and completed questionnaires assessing desire for order and organization behavior. Organized pictures made participants feel most pleasant, control pictures made participants feel less pleasant, slightly disorganized pictures made participants feel even less
A comparative study of application of different non-conventional filters on electroencephalogram., Gauri Shanker Gupta, Maanvi Bhatnagar, Shikhar Kumar, Rakesh Kumar Sinha
Main reference: A Delorme & S Makeig. EEGLAB: an open source toolbox for analysis of single-trial EEG dynamics, Journal of Neuroscience Methods 134:9-21 (2004) Theory: S Makeig, Bell AJ, Jung T-P, Sejnowski TJ. Independent component analysis of electroencephalographic data In: D. Touretzky, M. Mozer and M. Hasselmo (Eds). Advances in Neural Information Processing Systems 8:145-151 (1996) S Makeig, S Debener, J Onton, & A Delorme. Mining event-related brain dynamics, Trends in Cognitive Sciences, 8(5):204-210 (2004) Delorme A, Palmer J, Onton J, Oostenveld R, S Makeig, Independent EEG sources are dipolar PLoS One, i7(2):e30135. doi:10.1371/journalpone.0030135 (2012) S Makeig, C Kothe, T Mullen, N Bigdely-Shamlo, Z Zhang, K Kreutz-Delgado, Evolving signal processing for brain-computer interfaces (0.7 MB pdf) Proceedings of the IEEE 100:1567-1584 (2012) Toolboxes: Zeynep Akalin Acar & Scott Makeig, Neuroelectromagnetic Forward Head Modeling Toolbox J Neurosci Meth doi:10.1016/jneumeth.2010.04.031 ...
Research & Production Ltd. DX-SYSTEMS proposes: Electroencephalograph system BRAINTEST for investigation of brain electrical activity with digital video monitoring and investigation of evoked potentials features. Electromiograph M-TEST for examination of neuromuscular system by means of muscle and peripheral nerves potentials registration. Cardiograph, doppler, encephalograph, miograph, rheograph, Aberdeen - Aberdeen - Medical equipment, supplies, Aberdeen - 1676239
Research & Production Ltd. DX-SYSTEMS proposes: Electroencephalograph system BRAINTEST for investigation of brain electrical activity with digital video monitoring and investigation of evoked potentials features. Electromiograph M-TEST for examination of neuromuscular system by means of muscle and peripheral nerves potentials registration. Cardiograph, doppler, encephalograph, miograph, rheograph, Carlow - Carlow - Medical equipment, supplies, Carlow - 1676125
Research & Production Ltd. DX-SYSTEMS proposes: Electroencephalograph system BRAINTEST for investigation of brain electrical activity with digital video monitoring and investigation of evoked potentials features. Electromiograph M-TEST for examination of neuromuscular system by means of muscle and peripheral nerves potentials registration. Cardiograph, doppler, encephalograph, miograph, rheograph, Wexford - Wexford - Medical equipment, supplies, Wexford - 1676161
TY - JOUR. T1 - Decoding kinetic features of hand motor preparation from single-trial EEG using convolutional neural networks. AU - Gatti, Ramiro. AU - Atum, Yanina. AU - Schiaffino, Luciano. AU - Jochumsen, Mads. AU - Biurrun Manresa, José. PY - 2020/8/11. Y1 - 2020/8/11. KW - brain computer interface. KW - deep learning. KW - movement prediction. KW - multi-class classification. KW - neural engineering. UR - U2 - 10.1111/ejn.14936. DO - 10.1111/ejn.14936. M3 - Journal article. JO - European Journal of Neuroscience. JF - European Journal of Neuroscience. SN - 0953-816X. ER - ...
We examined a group of 77 autistic children (61 boys, 16 girls) of an average age 9.1 ± 5.3 years. The Childhood Autism Rating Scale (CARS), IQ test and 21 channel EEG (including night sleep EEG recording) were applied. It was possible to obtain evaluable EEG records in 63 patients. Missing EEG records were mostly due to noncooperation on the part of the autistic children. There were 28 normal EEGs (44.4%), 11 non-epileptiform abnormal EEGs (17.5%), and 24 abnormal EEGs with epileptiform discharges (38.1%). Using the median test, we compared the psychopathology in these three groups. No significant difference in the total CARS score was found among the groups. In the analysis of CARS items, there was only one significant difference among the groups in the 10th item - Fear or Nervousness (chi2 = 7.963, df = 2, p = 0.019 ...
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Sales, means the sales volume of Electroencephalography Amplifiers Revenue, means the sales value of Electroencephalography Amplifiers This report studies sales (consumption) of Electroencephalography Amplifiers in Europe market, especially in Germany, France, UK, Russia, Italy, Spain and Benelux, focuses on top players in these countries, with sales, price, revenue and market share for each play
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Humans, and other animals, are able to easily learn the durations of events and the temporal relationships among them in spite of the absence of a dedicated sensory organ for time. This chapter summarizes the investigation of timing and time perception using scalp-recorded electroencephalography (EE …
This is the first of a series on digital electroencephalography. The present discussion deals with:. 1. Changing electrode montages for display after recording is completed (so-called remontaging). (To read about the principles of forming electrode derivations and montages visit Holliday and Williams, VNN, 1999.). 2. Changing frequency limits after recording is completed.. 1. Changing Electrode Montages After Recording (remontaging).. Veterinary EEG recording typically is performed under certain limitations. Because of the cost of equipment, most veterinary laboratories have had polygraphs with only 6 or 8 EEG channels. By comparison, thirty-two channels are now used in routine recordings from human patients and even more in some specialized studies. In addition to monetary limits, there is an inherent limit on the number of electrodes that can be placed on the head of most veterinary patients, whose calvaria are often smaller even than those of children.. If a larger number of EEG channels ...
Neuronal oscillations exist across a broad frequency spectrum, and are thought to provide a mechanism of interaction between spatially separated brain regions. Since ongoing mental activity necessitates the simultaneous formation of multiple networks, it seems likely that the brain employs interactions within multiple frequency bands, as well as cross-frequency coupling, to support such networks. Here, we propose a multi-layer network framework that elucidates this pan-spectral picture of network interactions. Our network consists of multiple layers (frequency-band specific networks) that influence each other via inter-layer (cross-frequency) coupling. Applying this model to MEG resting-state data and using envelope correlations as connectivity metric, we demonstrate strong dependency between within layer structure and inter-layer coupling, indicating that networks obtained in different frequency bands do not act as independent entities. More specifically, our results suggest that frequency band
Table 3 presents results on the clinical and neuropsychological assessment of the subjects over time. 54% of OXC treatment group remained seizure free and 23% showed an average monthly reduction in seizure frequency of more than 50% during the first 6 month as did 50% and 19% of the non-treatment group. Statistically there was no significant difference between the two groups. The sleep EEGs became normalized in 15% of the treatment group and 19% of the non-treatment group after six months of treatment. As for the spike index, it increased by 20-50% in the treatment group after 6 months of treatment and fell by 20-90% in the non-treatment group over the same time period (p,0.05). Furthermore, the spike index of the right hemisphere decreased more in the non-treatment group than in the treatment group; however this different was not statistically significant (7.2±16.2 to 3.8±7.9 in NT vs. 15.5±17.6 to 19.1± 18.4 in T). The subjects made slight progress in general intelligence measures over ...
Electroencephalography (EEG) records fast-changing neuronal signalling and communication and thus can offer a deep understanding of cognitive processes. However, traditional data analyses which employ the Fast-Fourier Transform (FFT) have been of limited use as they do not allow time- and frequency-resolved tracking of brain activity and detection of directional connectivity. Here, we applied advanced qEEG tools using autoregressive (AR) modelling, alongside traditional approaches, to murine data sets from common research scenarios: (a) the effect of age on resting EEG; (b) drug actions on non-rapid eye movement (NREM) sleep EEG (pharmaco-EEG); and (c) dynamic EEG profiles during correct vs incorrect spontaneous alternation responses in the Y-maze ...
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What are Brainwaves , Brainwaves are the tiny pulses of the electrical activity alpha, Delta, Theta, Beta & Gamma brain waves. The brainwaves of SWS are of quite preponderant delta waves (1-4 Hz) and .. Miranda ER, Brouse A. Interfacing the brain directly with musical systems: on. During concentration, EEG delta (1- Hz) activity increases mainly in .. () also observed high amplitude Hz theta waves in both frontal .. K. R., John E. R., Brodie J., Günther W., Daruwala R., Prichep L. S. (). Delta waves can arise either in the thalamus or in the cortex. When associated with the thalamus, they are. an Alpha state of mind? Find out why alpha brain waves are so beneficial & learn to experience them yourself. And er thats it. Alpha brainwaves Theres some Theta stuff here too, but for now check out the Alpha waves. This is nice. Specifically, stimulation of the septohippocampal circuit in the theta frequency Unlike the spindle waves, delta oscillations are generated in a single cell M. T., ...
INTRODUCTION: Early identification of delayed cerebral ischemia (DCI) in patients with aneurysmal subarachnoid hemorrhage (aSAH) is a major challenge. The aim of this study was to investigate whether quantitative EEG (qEEG) features can detect DCI prior to clinical or radiographic findings. METHODS: A prospective cohort study was performed in aSAH patients in whom continuous EEG (cEEG) was recorded. We studied 12 qEEG features. We compared the time point at which qEEG changed with the time point that clinical deterioration occurred or new ischemia was noted on CT scan. Results : Twenty aSAH patients were included of whom 11 developed DCI. The alpha/delta ratio (ADR) was the most promising feature that showed a significant difference in change over time in the DCI group (median -62 % with IQR -87 to -39 %) compared to the control group (median +27 % with IQR -32 to +104 %, p = 0.013). Based on the ROC curve, a threshold was chosen for a combined measure of ADR and alpha variability (AUC: 91.7, 95 ...
Diagnosing Epilepsy. How is epilepsy diagnosed? There is no diagnostic test for a seizure or for epilepsy. The doctors diagnosis is based on a thorough investigation of a first seizure (including any witness observations), a physical examination, family history, and supportive tests such as the EEG, CT Scan, and MRI.. The description of what happens during during the seizure, along with any changes that happen before or after the seizure, are important features used by a healthcare providor to determine the seizure category and the seizure type. The duration of the seizure is another important feature.. What is an EEG?. The electroencephalograph or EEG directly measures electrical activity in the brain-brain waves-through the skin. In this harmless test, small sensors called electrodes are attached to the patients scalp. The electrical activity picked up by each sensor is graphed onto an EEG printout.. Tests are done on people with epilepsy commonly show uneven activity or large changes in the ...
This paper describes a technique based on electroencephalography (EEG) to control a robot arm. This technology could eventually allow people with severe disabilities to control robots that can help them in daily living activities. The EEG-based Brain Computer Interface (BCI) developed consists in register the brain rhythmic activity through a electrodes situated on the scalp in order to differentiate one cognitive process from rest state and use it to control one degree of freedom of the robot arm. In the paper the processing and classifier algorithm are described and an analysis of their parameters has been made with the objective of find the optimum configuration that allow obtaining the best results ...
Temporal cues guide attentional resources toward relevant points in time, resulting in optimized behavioral performance. Although deficits in aspects of attention have been documented in older adults, it remains unknown whether the critical ability to orient attention in time is affected by normal aging. To address this, younger and older adults participated in a temporally cued target-response experiment while electroencephalographic data were recorded. Three conditions (one detection and two discrimination tasks) were used to manipulate task complexity. Response times show that younger adults, but not older adults, used temporal cues to enhance performance regardless of task complexity. Similarly, alpha band activity (8-12 Hz) and the contingent negative variation preceding targets indicated that only younger adults engaged prestimulus, anticipatory neural mechanisms associated with temporal cues. Overall, these results provide novel evidence that older adults do not use temporal cues to orient
It has been suggested recently that the influence of the neuro-magnetic field should make electrical brain activity directly detectable by MRI. To test this hypothesis, we performed combined EEG-MRI experiments which aim to localize the neuronal current sources of alpha waves (8-12 Hz), one of the most prominent EEG phenomena in humans. A detailed analysis of cross-spectral coherence between simultaneously recorded EEG and MRI time series revealed no sign of alpha waves. Instead the EEG-MRI approach was found to be hampered by artefacts due to cardiac pulsation, which extend into the frequency band of alpha waves. Separate brain displacement mapping experiments confirmed that not only the EEG but also the MRI signal is confounded by harmonics of the cardiac frequency even at 10 Hz and beyond. This well-known ballistocardiogram artefact cannot be avoided or eliminated entirely by available signal processing techniques. Therefore we must conclude that current EEG-MRI methodology based on ...
Event-related potentials (ERPs) have been used for decades to study perception, cognition, emotion, neurological and psychiatric disorders, and lifespan development. ERPs consist of multiple components and reflect a specific neurocognitive process.
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Sleep-related vehicle accidents account for many injuries and fatalities each year on monotonous motorways and roads. To effectively prevent such incidents requires greater knowledge of the mechanisms and development of the effects of sleep deprivation. Ten volunteers participated in a laboratory study aimed to analyze the way changes in wakefulness were described in terms of EEG changes and subjective ratings. Patients and methods For each subject, the study consisted of four testing sessions that varied in length on different days: one session each of 60, 90, and 120 min when sleep-deprived, and one session of 120 min when rested. Changes in wakefulness were analyzed using electroencephalographic recordings and ratings on two different scales, the Karolinska Sleepiness Scale (KSS) and the Category-Ratio Scale (CR-10). Results The results indicate quite conclusively that significant changes in the perception of sleepiness occur during the first 60-90 min of sedentary, monotonous work. Beyond ...
Electroencephalography[edit]. Electroencephalograms, or EEG, are tests used to depict electrical activity and waves produced by ... Through the use of electroencephalography, health professionals are able to determine if the sexual behaviors are occurring ...
Look up electroencephalography, electroencephalogram, electroencephalograph, or brainwave in Wiktionary, the free dictionary. ... Electroencephalography (EEG) is an electrophysiological monitoring method to record electrical activity on the scalp that has ... Niedermeyer E.; da Silva F.L. (2004). Electroencephalography: Basic Principles, Clinical Applications, and Related Fields. ... I. Evoked responses after thalamic and epicortical stimulation". Electroencephalography and Clinical Neurophysiology. 20 (1): 1 ...
Electroencephalography (EEG)[edit]. In a study employing the EEG method of examining brain activation, participants were given ... Neural correlates of the self-serving bias have been investigated by electroencephalography (EEG),[12] as well as functional ...
Electroencephalography. EEG measures the electrical fields generated by large populations of neurons in the cortex by placing a ...
Omejc N, Rojc B, Battaglini P, Marusic U. Review of the therapeutic neurofeedback method using electroencephalography: EEG ... Electroencephalography and Clinical Neurophysiology, 13, 452-456. Kasamatsu, A., & Hirai, T. (1966). An electroencephalographic ... is a type of biofeedback that uses real-time displays of brain activity-most commonly electroencephalography (EEG)-in an ... Electroencephalography and Clinical Neurophysiology. 33 (1): 89-95. doi:10.1016/0013-4694(72)90028-4. PMID 4113278. Sterman MB ...
Electroencephalography is the measurement of brain activity through the surface of the scalp. Electroencephalography data can ... Clinical Electroencephalography. 25 (4): VI-XXII. doi:10.1177/155005949402500403. PMID 7813090. S2CID 29808694. Archived from ... analytical procedures and certain derived summary indices of these analyses are called quantitative electroencephalography ( ...
Casson, Alexander (10 May 2010). "Wearable electroencephalography. What is it, why is it needed, and what does it entail?" (PDF ... Moss, James (2017). "The Efficacy of In-Ear Electroencephalography (EEG) to Monitor Sleep Latency and the Impact of Sleep ... resulting in both a much greater invisibility and wearer mobility compared to full scalp electroencephalography (EEG), but also ...
Electroencephalography (EEG). EEG is the only investigation with abnormal results, usually showing multiple spikes in various ...
He also studied the electroencephalography (EEG) correlates of meditative states. Operant conditioning of EEG has had ... Clinical Electroencephalography. 31 (1): 45-55. doi:10.1177/155005940003100111. PMID 10638352. Roman, H.R. & Boyce, T.E. (2001 ...
Clinical Electroencephalography. 32 (1): 20-3. doi:10.1177/155005940103200106. PMID 11202137. S2CID 35417045. Leadership, ...
Gibbs, FA (1952). Atlas of electroencephalography. Cambridge, Mass.: Addison-Wesley. Hrachovy, RA; Frost JD (2003). "Infantile ...
Fetal electroencephalography, also known as prenatal EEG includes any recording of electrical fluctuations arising from the ... Borkowski, Winslow J.; Bernstine, Richard L. (1955-05-01). "Electroencephalography of the Fetus". Neurology. 5 (5): 362-5. doi: ... Bernstine, Richard L.; Borkowski, Winslow J.; Price, A.H. (1955). "Prenatal fetal electroencephalography". American Journal of ... Bernstine, Richard Lee (1961). Fetal electrocardiography and electroencephalography. Thomas. pp. 63-69. Urigüen, Jose Antonio; ...
ElectroencephalographyEdit. Image 7: Examples of rat hippocampal EEG and CA1 neural activity in the theta (awake/behaving) and ...
Electroencephalography and Clinical Neurophysiology. 18 (7): 691-708. doi:10.1016/0013-4694(65)90113-6. PMID 14297542. ...
Taheri, B; Knight, R; Smith, R (1994). "A dry electrode for EEG recording☆". Electroencephalography and Clinical ... In some cases, biofeedback does not monitor electroencephalography (EEG), but instead bodily parameters such as ... "Use of Electroencephalography Brain-Computer Interface Systems as a Rehabilitative Approach for Upper Limb Function After a ... starts with Hans Berger's discovery of the electrical activity of the human brain and the development of electroencephalography ...
Preliminary observations". Electroencephalography and Clinical Neurophysiology. 70 (6): 482-9. doi:10.1016/0013-4694(88)90146-0 ...
Electroencephalography and Clinical Neurophysiology. 101 (5): 365-374. ISSN 0013-4694. PMID 8913188. Sathya, G. R.; ...
Electroencephalography and Clinical Neurophysiology. 36 (1): 1-18. doi:10.1016/0013-4694(74)90132-1. PMID 4128428. Archived ...
Fifth International Congress of Electroencephalography and Clinical Neurophysiology. Rome-Italy, 7-13 Sept. 1961. Exc. Med. Int ... Electroencephalography and Clinical Neurophysiology. 14 (4): 453-464. doi:10.1016/0013-4694(62)90051-2. PMID 13922227. Barlow, ...
Electroencephalography and Clinical Neurophysiology, Vol. 13, 1961, pp 449-451. Zakharova, N. N., and Avdeev, V. M., " ... Beat (acoustics) Electroencephalography Neural oscillation Fredricks, R. (2008). Healing and Wholeness: Complementary and ... da Silva FL (1991). "Neural mechanisms underlying brain waves: from neural membranes to networks". Electroencephalography and ... Niedermeyer E. and da Silva F.L., Electroencephalography: Basic Principles, Clinical Applications, and Related Fields. ...
In neuroscience, the N100 or N1 is a large, negative-going evoked potential measured by electroencephalography (its equivalent ... Electroencephalography and Clinical Neurophysiology. 52 (1): 9-17. doi:10.1016/0013-4694(81)90183-8. PMID 6166459. Budd, T. W ... Electroencephalography and Clinical Neurophysiology. 69 (2): 160-170. doi:10.1016/0013-4694(88)90211-8. PMID 2446835. Nash, A. ... Electroencephalography and Clinical Neurophysiology. 38 (5): 449-461. doi:10.1016/0013-4694(75)90187-x. PMID 50170. Vaughan Jr ...
Electroencephalography and Clinical Neurophysiology. 66 (6): 529-38. doi:10.1242/dev.098269. PMC 3896947. PMID 2438119. ...
Electroencephalography and Clinical Neurophysiology. 9 (4): 673-690. doi:10.1016/0013-4694(57)90088-3. PMID 13480240. Dement, W ...
Electroencephalography and Clinical Neurophysiology. 54 (3): 322-325. doi:10.1016/0013-4694(82)90181-x. PMID 6179759. "Freedom ...
Electroencephalography and Clinical Neurophysiology. 8 (3): 371-384. doi:10.1016/0013-4694(56)90003-7. Delgado, José M.R. (1964 ...
Report of an IFCN committee". Electroencephalography and Clinical Neurophysiology. 91 (2): 79-92. doi:10.1016/0013-4694(94) ...
Coenen A, Fine E, Zayachkivska O (2014). "Adolf Beck: a forgotten pioneer in electroencephalography". Journal of the History of ... Phase resetting also permits the study of evoked activity, a term used in electroencephalography and magnetoencephalography for ... Moruzzi G, Magoun HW (November 1949). "Brain stem reticular formation and activation of the EEG". Electroencephalography and ... The term ongoing brain activity is used in electroencephalography and magnetoencephalography for those signal components that ...
Yamaguchi, S.; Knight, R. T. (1991). "P300 generation by novel somatosensory stimuli". Electroencephalography and Clinical ... Electroencephalography and Clinical Neurophysiology. 38 (4): 387-401. CiteSeerX doi:10.1016/0013-4694(75)90263- ...
Human electroencephalography, first practiced in 1920, was applied to the study of creativity in the early 1970s. As in vivo ... Electroencephalography and Clinical Neurophysiology. 106 (2): 173-6. doi:10.1016/S0013-4694(97)00121-1. PMID 9741779.CS1 maint ...
They are commonly used in the analysis of electroencephalography signals for feature extraction. The parameters are normalised ... Hjorth, Bo; Elema-Schönander, AB (1970). "EEG analysis based on time domain properties". Electroencephalography and Clinical ...
Look up electroencephalography, electroencephalogram, electroencephalograph, or brainwave in Wiktionary, the free dictionary. ... Electroencephalography (EEG) is an electrophysiological monitoring method to record electrical activity on the scalp that has ... Niedermeyer E.; da Silva F.L. (2004). Electroencephalography: Basic Principles, Clinical Applications, and Related Fields. ... I. Evoked responses after thalamic and epicortical stimulation". Electroencephalography and Clinical Neurophysiology. 20 (1): 1 ...
The electrical activity of the brain was first demonstrated in 1929 by the German psychiatrist Hans Berger. The scientific professions were slow in giving proper attention to Bergers discovery of the brain rhythms he named alpha waves, but since then
Clinical Electroencephalography. Editors. * Oriano Mecarelli Copyright. 2019. Publisher. Springer International Publishing. ... His main area of interest is electroencephalography and clinical epileptology. He is President of the Italian League against ... This book describes the developments and improvements in electroencephalography (EEG). In recent years, digital technology has ...
Electroencephalography (EEG) is an electrophysiological monitoring method to record electrical activity on the scalp that has ... The use of computer signal processing of the EEG-so-called quantitative electroencephalography-is somewhat controversial when ... Therefore, current usage in electroencephalography refers to the phenomenon as an eyelid fluttering artifact, rather than a ... Computational processing of the EEG is often named quantitative electroencephalography (qEEG). Most of the cerebral signal ...
Fink M. Pharmaco-Electroencephalography: A Selective History of the Study of Brain Responses to Psychoactive Drugs. In: T. Ban ... Electroencephalography (EEG) is the science of recording the spontaneous rhythmic electrical activity of a living brain through ...
... electroencephalography), also called SEEG, to determine if epilepsy surgery is right for your child. ... Stereo EEG, also called SEEG, stands for stereo electroencephalography. It is a minimally invasive procedure that helps the ...
Tag: electroencephalography. Neuroscience/Mental Health. Music for ADHD?. In a recent "Ask Me Anything" on Reddit, the CEO of ...
Mobile high-density electroencephalography (EEG) allows electrical brain activity to be measured non-invasively during gait, ... Recent evidence suggests that event-related potentials (ERPs) measured with electroencephalography (EEG) are... Read more ...
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... plural electroencephalographies) 1. (neurology) The measurement and recording of electrical activity in the brain for ... plural electroencephalographies). *(neurology) The measurement and recording of electrical activity in the brain for diagnostic ... "electroencephalography." YourDictionary, n.d. Web. 15 January 2019. ,,. ... electroencephalography. (n.d.). Retrieved January 15th, 2019, from ...
Looking for an Electroencephalography (EEG) Technician? We found others matching your search, to help you compare.. ... Looking for an Electroencephalography (EEG) Technician? We found others matching your search, to help you compare.. ... Jonathan Harris is an electroencephalography (eeg) provider who practices in Sacramento, CA.. ...
Brief Description of equipment: 16 channel EEG system Capabilities of the equipment: Record EEG potentials Location of equipment: Irvine Hall 241
An electroencephalogram is a recorded electroencephalography. Both are abbreviated EEG. Electroencephalography is used to ... Electroencephalography is a way to record certain patterns of brain activity, on the skin of the head. Nerve cells use ... Retrieved from "" ...
... Seetharam Raghavendra,1 Javeria Nooraine,1 ... Comprehensive presurgical evaluation includes electroencephalography (EEG) and video EEG in identifying patients who are likely ...
We have three electroencephalography (EEG) labs, as well as hair washing-facilities and dedicated preparation areas for study ... Electroencephalography labs. Watch a video about electroencephalography. Electroencephalography (EEG) is a non-invasive ...
Electroencephalography. Electroencephalography (EEG) is the recording of electrical activity along the scalp. EEG measures ... Other articles related to electroencephalography:. Human Brain - Sources of Information - Electroencephalography. ... the ... Read more about Electroencephalography: Source of EEG Activity, Clinical Use, Research Use, Method, Normal Activity, Abnormal ... summed electrical activity of the cortex, using a methodology known as electroencephalography (EEG) ... ...
According to Stratistics MRC, the Global Electroencephalography (EEG) Systems market is estimated at $700.45 million in 2016 ... Electroencephalography (EEG) Systems - Global Market Outlook (2016-2022). Thursday, April 27, 2017 Research News ... North America dominated the Electroencephalography systems market which can be attributed to increasing occurrence of various ... To view the original version on PR Newswire, visit: ...
Electroencephalography Definition A technique for studying the electrical currents within the brain. Electrodes are attached to ... Electroencephalography: Basic Principles, Clinical Applications and Related Fields. Lippincott Williams & Wilkins, 1999.. ... Atlas and Classification of Electroencephalography. WB Saunders, 1999.. Niedermeyer, E. and F. L. Da Silva. ...
Sensitivity of Amplitude-Integrated Electroencephalography for Neonatal Seizure Detection. Renée A. Shellhaas, Adina I. Soaita ... Sensitivity of Amplitude-Integrated Electroencephalography for Neonatal Seizure Detection. Renée A. Shellhaas, Adina I. Soaita ... Amplitude-Integrated Electroencephalography in the NICU: Frequent Artifacts in Premature Infants May Limit Its Utility as a ... Sensitivity of Amplitude-Integrated Electroencephalography for Neonatal Seizure Detection Message Subject (Your Name) has sent ...
Looking for an Electroencephalography (EEG) Technician? We found others matching your search, to help you compare.. ... Looking for an Electroencephalography (EEG) Technician? We found others matching your search, to help you compare.. ... Marat Avshalumov, PHD is an electroencephalography (eeg) provider who practices in Rockville Centre, NY.. ...
... electroencephalography in English->French dictionary. Search nearly 14 million words and phrases in more than 468 language ... Results for: electroencephalography. English. French. electroencephalography. électroencéphalographie (enregistrement des ... electroencephalography BDP u realnom iskazu அகணி, அகடு 不一定 [bu-yi-ding] dragon (esp. a Chinese dragon); naga (semidivine human- ... electroencephalography. Electrolock. electroluminescent display. electrolyse. Electrolysis. Electrolyte. electrolytic. ...
BSL EEG lesson I is an introduction to electroencephalographic recording techniques. The lesson demonstrates how the brains electrical activity varies dependent upon the task being performed. Students record EEG from the occipital lobe while performing a number of different tasks. The software will automatically filter the data to display alpha, beta, delta, and theta wave components. Students will measure and compare the EEG activity associated with various tasks ...
Wired , EEG: Electroencephalography. MP36R with AcqKnowledge plus electrode lead adapter, 8 mm shielded TP electrode and 8 mm ... Animal , EEG: Electroencephalography. MP36R with AcqKnowledge plus electrode lead adapter and three 12 mm TP unipolar needle ... Animal , EEG: Electroencephalography. EPOCH implantable EEG system with MP160 System for long-term wireless EEG/neural signal ... Full Line of Electroencephalography Acquistion & Analysis Solutions for Human & Animal Research. Fully automated routines ...
EEG Laboratory Lead, Dr Giorgio Ganis, Associate Professor, has been using electroencephalography (EEG), brain stimulation (TMS ... By using a technique called electroencephalography (EEG), which measures electrical activity in the brain with high temporal ... The Fundamental and Applied Electroencephalography lab in the BRIC facility will include stationary and mobile EEG systems. ... The Fundamental and Applied Electroencephalography Laboratory. A specialist Brain Research & Imaging Centre (BRIC) laboratory ...
Electroencephalography in central pontine myelinolysis may demonstrate diffuse bihemispheric slowing. Brainstem-evoked ... What is the role of electroencephalography in the treatment of central pontine myelinolysis (CPM)?. Updated: Oct 09, 2017 ... encoded search term (What is the role of electroencephalography in the treatment of central pontine myelinolysis (CPM)?) and ... Electroencephalography in central pontine myelinolysis may demonstrate diffuse bihemispheric slowing. Brainstem-evoked ...
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This chapter summarizes the investigation of timing and time perception using scalp-recorded electroencephalography (EE … ... Probing interval timing with scalp-recorded electroencephalography (EEG) Adv Exp Med Biol. 2014;829:187-207. doi: 10.1007/978-1 ... This chapter summarizes the investigation of timing and time perception using scalp-recorded electroencephalography (EEG), a ...
Electroencephalography. Electroencephalography (EEG) is the recording of electrical activity along the scalp produced by the ... -- A portable, plugless, brain-to-computer interface using electroencephalography (EEG) electrodes strapped to the ... Such is the case in a new study of electroencephalography (EEG) readings ... ...
We present a solution to the electroencephalographs (EEG) forward problem of computing the scalp electric potentials for the case when the heads geometry is mo
Most research studies investigate these ERP components using clinical or research-grade electroencephalography (EEG) systems. ... Most research studies investigate these ERP components using clinical or research-grade electroencephalography (EEG) systems. ... Assessing Feedback Response With a Wearable Electroencephalography System. Jenny M. Qiu1*, Michael A. Casey2 and Solomon G. ... Citation: Qiu JM, Casey MA and Diamond SG (2019) Assessing Feedback Response With a Wearable Electroencephalography System. ...
  • Electroencephalography is used to detect epilepsy , coma , sleep and brain death . (
  • Electroencephalography (EEG) is used as a diagnostic tool for a spectrum of conditions including epilepsy, seizures, cerebrovascular diseases, head injuries, psychiatric diseases, and encephalopathies. (
  • Included in this retrospective study were a consecutive series of 50 patients who underwent magnetoencephalography and stereo-electroencephalography at the Cleveland Clinic Epilepsy Center. (
  • Which electroencephalography (EEG) for epilepsy? (
  • Electroencephalography (EEG) is an essential investigative tool for use in young people with epilepsy. (
  • To observe and evaluate the efficacy of valproate on electroencephalography and obesity in children with epilepsy. (
  • It's suggested that valproate improve the electroencephalography and clinical systems of children with epilepsy, but valproate induce the obesity which could be relative with the serum values of leptin, adiponectin, leptin/adiponectin. (
  • To this end, we have used functional diffuse correlation spectroscopy (fDCS) and time-resolved functional near-infrared spectroscopy (TR-fNIRS) together with electroencephalography (EEG) during and after stimulation of the frontal cortex. (
  • Measuring the exact placement of probes (e.g., electrodes and optodes) on a participant's head is a notoriously difficult step in acquiring neuroimaging data from methods that rely on scalp recordings (e.g., electroencephalography and functional near-infrared spectroscopy) and is particularly difficult for any clinical or developmental population. (
  • Functional near-infrared spectroscopy (fNIRS) and electroencephalography (EEG) require knowledge of the positioning of probes on subjects' scalps. (
  • Few data have been published on the combined use of amplitude-integrated electroencephalography (aEEG) and near-infrared spectroscopy (NIRS) for outcome prediction in neonates cooled for hypoxic-ischemic encephalopathy (HIE). (
  • The Impact of Amplitude-Integrated Electroencephalography on NICU Practice. (
  • Objective: To examine how the introduction of amplitude-integrated electroencephalography (aEEG) to our neonatal intensive care unit (NICU) influenced clinical practice. (
  • This study aimed to correlate amplitude-integrated electroencephalography findings with early outcomes, measured by mortality and neuroimaging findings, in a prospective cohort of infants at high risk for brain injury in this center in Brazil. (
  • This blinded prospective cohort study evaluated 23 preterm infants below 31 weeks of gestational age and 17 infants diagnosed with hypoxic-ischemic encephalopathy secondary to perinatal asphyxia, with gestational age greater than 36 weeks, monitored with amplitude-integrated electroencephalography in a public tertiary center from February 2014 to January 2015. (
  • In patients with hypoxic-ischemic encephalopathy, seizure patterns on amplitude-integrated electroencephalography traces were associated with mortality or brain lesion in cranial magnetic resonance imaging (p = 0.005). (
  • This study supports previous results and demonstrates the utility of amplitude-integrated electroencephalography for monitoring brain function and predicting early outcome in the studied groups of infants at high risk for brain injury. (
  • Effects of morphine and midazolam on sleep-wake cycling in amplitude-integrated electroencephalography in post-surgical neonates = 32 weeks of gestational age. (
  • What are the key factors driving the global Electroencephalography Equipment market? (
  • What are the Electroencephalography Equipment market opportunities and threats faced by the vendors in the global Electroencephalography Equipment market? (
  • Global Electroencephalography Equipment Market 2015-2019, has been prepared based on an in-depth market analysis with inputs from industry experts. (
  • it also covers the landscape of the global electroencephalography equipment market and its growth prospects in the coming years. (
  • Research analysts forecast the global electroencephalography equipment market to grow at a CAGR of 7.34 during 2014-2019. (
  • Covered in this report The electroencephalography equipment report covers the current scenario and the growth prospects of the global electroencephalography equipment market for 2015-2019. (
  • The report covers APAC, EMEA, and the America it also covers the landscape of the global electroencephalography equipment market and its growth prospects in the coming years. (
  • In 1935, Gibbs, Davis and Lennox described inter ictal spike waves and the three cycles/s pattern of clinical absence seizures , which began the field of clinical electroencephalography. (
  • His main area of interest is electroencephalography and clinical epileptology. (
  • In 1935, Gibbs, Davis and Lennox described interictal spike waves and the three cycles/s pattern of clinical absence seizures, which began the field of clinical electroencephalography. (
  • Most research studies investigate these ERP components using clinical or research-grade electroencephalography (EEG) systems. (
  • This comprehensive atlas presents the clinical practice of neonatal electroencephalography (EEG) through text, references, and detailed figures demonstrating normal and abnormal features of the neonatal EEG from the most premature infant to one month post-term. (
  • Early Detection of Preterm Intraventricular Hemorrhage From Clinical Electroencephalography. (
  • Niedermeyer's Electroencephalography: Basic Principles, Clinical Applications, and Related Fields, Seventh Edition keeps the clinical neurophysiologist on the forefront of medical advancements. (
  • This preliminary report is an account of 21 consecutive patients who had tinnitus of the severe disabling type and were examined with quantitative electroencephalography (QEEG). (
  • Conventional and quantitative electroencephalography in psychiatry. (
  • Purpose: To determine if continuous quantitative electroencephalography percent alpha variability(EEGPAV)can discriminate areas of critically reduced cerebral blood flow (CBF). (
  • Quantitative electroencephalography (qEEG) is a good candidate and the statistical pattern recognition (SPR) method has recently provided promising results. (
  • We developed a multifactorial model combining quantitative electroencephalography (qEEG) measurements and clinically relevant parameters as proof of concept for outcome prediction of patients with moderate to severe TBI. (
  • What is the role of electroencephalography in the treatment of central pontine myelinolysis (CPM)? (
  • Terry Daugherty, Ernest Hoffman, Kathleen Kennedy, and Megan Nolan (2014) ,"Consumer Neuroscience: Testing Effectual Advertising Using Dense-Array Electroencephalography", in NA - Advances in Consumer Research Volume 42, eds. (
  • Stereo EEG, also called SEEG, stands for stereo electroencephalography. (
  • Magnetoencephalography and stereo-electroencephalography are often necessary in the course of the non-invasive and invasive presurgical evaluation of challenging patients with medically intractable focal epilepsies. (
  • In this study, we aim to examine the significance of magnetoencephalography dipole clusters and their relationship to stereo-electroencephalography findings, area of surgical resection, and seizure outcome. (
  • Magnetoencephalography dipole clusters, stereo-electroencephalography findings and area of resection were reconstructed and examined in the same space using the patient's own magnetic resonance imaging scan. (
  • Furthermore, patients had a significantly higher chance of being seizure-free when stereo-electroencephalography completely sampled the area identified by magnetoencephalography as compared to those with incomplete or no sampling of magnetoencephalography results (P = 0.012). (
  • Partial concordance between magnetoencephalography and interictal or ictal stereo-electroencephalography was associated with a much lower chance of seizure freedom as compared to the concordant group (P = 0.0075). (
  • Our data demonstrate that stereo-electroencephalography exploration and subsequent resection are more likely to succeed, when guided by positive magnetoencephalography findings. (
  • As a corollary, magnetoencephalography clusters should not be ignored when planning the stereo-electroencephalography strategy. (
  • The concordance pattern between magnetoencephalography and stereo-electroencephalography is a strong argument in favour of incorporating localization with non-invasive tools into the process of presurgical evaluation before actual placement of electrodes. (
  • Atlas of Neonatal Electroencephalography is a singular atlas, unrivaled in the breadth of its coverage and level of detail in presenting examples of normal and abnormal recordings of neonatal EEG patterns at varying young ages. (
  • Following the pioneering work of C. Dreyfus-Brisac and N. Monod, research into neonatal electroencephalography (EEG) has developed tremendously in France. (
  • Routine inpatient electroencephalography (EEG) is commonly used as a diagnostic and therapeutic decision-making tool in the care of patients with a wide spectrum of conditions. (
  • I found the recent report by Harmon and colleagues on inpatient electroencephalography (EEG) very interesting. (
  • The leading reference on electroencephalography since 1982, Niedermeyer's Electroencephalography is now in its thoroughly updated sixth edition. (
  • Objectives To evaluate whether single-channel electroencephalography (EEG) recording can be conducted in the out-of-hospital setting and whether it can be used to record electrographic signs of convulsive epileptic seizures. (
  • Electroencephalography ( EEG ) is an electrophysiological monitoring method to record electrical activity on the scalp that has been shown to represent the macroscopic activity of the surface layer of the brain underneath. (
  • Electroencephalography, or EEG, is a neurological test that involves attaching electrodes to the head of a person to measure and record electrical activity in the brain over time. (
  • Throughout the procedure, the electroencephalography unit makes a continuous graphic record of the person's brain activity, or brain waves, on a long strip of recording paper or computer screen. (
  • Electroencephalography (EEG) is the science of recording the spontaneous rhythmic electrical activity of a living brain through electrodes on the scalp. (
  • Electroencephalography is a way to record certain patterns of brain activity, on the skin of the head. (
  • Electroencephalography (EEG) is a non-invasive technique which records electrical activity generated by the brain through sensors placed on the scalp. (
  • By using a technique called electroencephalography (EEG) , which measures electrical activity in the brain with high temporal resolution, we can find out more about the neural processes that support these abilities, advancing not only basic research but, ultimately, research in mental health and other applied fields. (
  • This chapter summarizes the investigation of timing and time perception using scalp-recorded electroencephalography (EEG), a non-invasive technique that measures brain electrical potentials on a millisecond time scale. (
  • -- A portable, plugless, brain-to-computer interface using electroencephalography (EEG) electrodes strapped to the scalp has been developed by a team in the US. (
  • Electroencephalography (EEG) is the recording of electrical activity along the scalp produced by the firing of neurons within the brain. (
  • At present the task of diagnosing brain disorders using electroencephalography (EEG) is still performed by humans, but in years to come it will increasingly be taken over by computerized systems. (
  • In this study, we performed functional magnetic resonance imaging and electroencephalography (fMRI-EEG) simultaneously to elucidate the brain areas that were found in a previous study to be activated through stimulation of the magnocellular system, and then investigated the mechanism involved in the dysfunction seen in DD. (
  • Electroencephalography (EEG) is a technology which records brain activity. (
  • New York, Nov. 16, 2015 (GLOBE NEWSWIRE) -- According to the latest market report published by Persistence Market Research titled " Global Market Study on Electroencephalography (EEG) Devices: Increased Demand for Advanced Imaging Techniques for Brain Monitoring has Led to Proliferation of EEG Devices in Recent Years ", the global EEG devices market was valued at US$ 879.0 Mn in 2014. (
  • Motor imagery electroencephalography (EEG), which embodies cortical potentials during mental simulation of left or right finger lifting tasks, can be used as neural input signals to activate brain computer interface (BCI). (
  • About electroencephalography equipment An electroencephalogram (EEG) is a technique used to detect electrical activity in the brain using electrodes that are attached to the scalp. (
  • Objectives: The aim of this study was to investigate whether early electroencephalography (EEG) activity in infants born very preterm is associated with brain volumes at term, and whether postnatal morbidity affects this association. (
  • Determining brain lesions by quantified electroencephalography is effected by obtaining absolute power data in a primary frequency domain for a brain region. (
  • The aim of the proposed research is to compare the diagnostic accuracy of a portable wireless electroencephalography (EEG) device (Biosignal Micro-EEG) to standard EEG in identifying abnormal EEG patterns (mainly non-convulsive seizure and non-convulsive status epilepticus) in emergency department (ED) patients with altered mental status. (
  • Diagnosis is often based on seizure history and electroencephalography (EEG) assessment. (
  • Electroencephalography ( EEG ) is the recording of electrical activity along the scalp. (
  • We use electroencephalography (EEG) signals to select the robot at which the operator is looking. (
  • North America dominated the Electroencephalography systems market which can be attributed to increasing occurrence of various sleep & neurodegenerative disorders and accessibility to insurance. (
  • This report focuses on the Electroencephalography Equipment in Global market, especially in North America, Electroencephalography Equipment Market in Europe and Asia-Pacific, Electroencephalography Equipment Market in Latin America, Electroencephalography Equipment Market in Middle and Africa. (
  • A continuous video-electroencephalography (EEG) recording, and/or diligent direct observation, facilitates quantification of exact duration of different stages of convulsive seizures (Racine stages 3-5) to determine the severity of SE. (
  • ECMCC is seeking proposals from qualified vendors to provide real-time standard Electroencephalography (EEG), continuous EEG and video EEG monitoring service to ensure ECMCC has access to quality real-time EEG and video EEG monitoring services. (
  • Does the first hour of continuous electroencephalography predict neonatal seizures? (
  • electroencephalography ( EEG ) and functional MRI to observe the neurophysiological indices surrounding performance. (
  • We used simultaneous acquisition of functional magnetic resonance imaging (fMRI) and electroencephalography (EEG) in the absence of any paradigm to test an ensuing hypothesis, namely that spontaneous fluctuations in this ICN′s activity (as measured by fMRI) should show a positive correlation with the electrical signatures of tonic alertness (as recorded by concurrent EEG). (
  • According to Stratistics MRC, the Global Electroencephalography (EEG) Systems market is estimated at $700.45 million in 2016 and is expected to reach $1152.23 million by 2022 growing at a CAGR of 8.6% from 2016 to 2022. (
  • Global Market Research Report on Electroencephalography and Electromyography Market 2016 is a professional and in-depth complete study on the current state of the Electroencephalography and Electromyography worldwide. (
  • An electroencephalogram is a recorded electroencephalography. (
  • What will the market growth rate of Electroencephalography Equipment market in 2020? (
  • All study participants will undergo electroencephalography using the two devices (standard EEG and micro-EEG) and a combination of standard electrodes and Electro-Cap in a randomized order: 1. (
  • A method developed for registration of ictal and interictal single-photon emission tomography (SPET), magnetic resonance imaging (MRI) and electroencephalography (EEG) is described. (
  • Endovascular electroencephalography: the technique and its application during carotid amytal assessment. (
  • Electroencephalography (EEG) forms the basis of multiple neurophysiological techniques and is a powerful diagnostic tool. (
  • Specific patterns of psychophysiological activity from the cerebral cortex, in the form of event-related slow potentials (SPs), as well as spectral content measured by electroencephalography (EEG), occur in the few seconds of performance (preshot) preparation. (
  • ACT-R » Publications » Stages of Processing in Associative Recognition: Evidence from Behavior, Electroencephalography, and Classification. (
  • This app is a combination of sets, containing practice questions, study cards, terms & concepts for self learning & exam preparation on the topic of Electroencephalography-EEG-CLTM. (
  • This study covers the world outlook for electroencephalography (EEG) devices across more than 190 countries. (
  • This study gives, however, my estimates for the worldwide latent demand, or the P.I.E., for electroencephalography (EEG) devices. (
  • In the research presented in this thesis, I employed high-density electroencephalography in order to study the neural processes underlying preparation for action. (
  • Electroencephalography in premature and full-term infants. (
  • This medical illustration shows the location of sensors used in an electroencephalography (EEG) diagnostics test to measure and record the brain's electrical activity. (
  • In this report, the global Electroencephalography (EEG) Systems market is valued at USD XX million in 2017 and is expected to reach USD XX million by the end of 2025, growing at a CAGR of XX% between 2017 and 2025. (
  • Electroencephalography Equipment Market analysis is provided for global market including development trends by regions, competitive analysis of the Electroencephalography Equipment market. (
  • What are sales, revenue, and price analysis of top manufacturers of Electroencephalography Equipment market? (
  • Who are the distributors, traders and dealers of Electroencephalography Equipment market? (
  • Who are the key vendors in Electroencephalography Equipment market space? (
  • What are the market opportunities, market risk and market overview of the Electroencephalography Equipment market? (
  • Worden MS, Foxe JJ, Wang N et al (2000) Anticipatory biasing of visuospatial attention indexed by retinotopically specific alpha-band electroencephalography increases over occipital cortex. (
  • Electroencephalography (EEG) and an electromyography (EMG) are diagnostic techniques used to measure the electrical activity in human body. (
  • Electroencephalography and MMPI results of patients with insomnia. (
  • Home / Test Division / Reference Database / 1990 to 1999 / 1997 / Electroencephalography and MMPI results of patients with insomnia. (
  • Practical Approach to Electroencephalography, by Mark H. Libenson, MD, equips you with just the right amount of guidance you need for obtaining optimal EEG results! (
  • The efficacy, the results of electroencephalography, the body mass index, the serum values of leptin, adiponectin, leptin/adiponectin of patients in the two groups were evaluated and compared. (