Alpha Rhythm: 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.Occipital Lobe: 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.Electroencephalography: 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.Circadian Rhythm: The regular recurrence, in cycles of about 24 hours, of biological processes or activities, such as sensitivity to drugs and stimuli, hormone secretion, sleeping, and feeding.Parietal Lobe: 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.Brain Mapping: Imaging techniques used to colocalize sites of brain functions or physiological activity with brain structures.Photic Stimulation: Investigative technique commonly used during ELECTROENCEPHALOGRAPHY in which a series of bright light flashes or visual patterns are used to elicit brain activity.Exercise Movement Techniques: Methods or programs of physical activities which can be used to promote, maintain, or restore the physical and physiological well-being of an individual.Chronic Pain: Aching sensation that persists for more than a few months. It may or may not be associated with trauma or disease, and may persist after the initial injury has healed. Its localization, character, and timing are more vague than with acute pain.Neural Networks (Computer): A computer architecture, implementable in either hardware or software, modeled after biological neural networks. Like the biological system in which the processing capability is a result of the interconnection strengths between arrays of nonlinear processing nodes, computerized neural networks, often called perceptrons or multilayer connectionist models, consist of neuron-like units. A homogeneous group of units makes up a layer. These networks are good at pattern recognition. They are adaptive, performing tasks by example, and thus are better for decision-making than are linear learning machines or cluster analysis. They do not require explicit programming.Fourier Analysis: 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)Magnetoencephalography: 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.Magnetometry: The measurement of various aspects of MAGNETIC FIELDS.Cardiac-Gated Single-Photon Emission Computer-Assisted Tomography: Tomography using single-photon emitting RADIONUCLIDES to create images that are captured in times corresponding to various points in the cardiac cycle.Dental Impression Materials: Substances used to create an impression, or negative reproduction, of the teeth and dental arches. These materials include dental plasters and cements, metallic oxide pastes, silicone base materials, or elastomeric materials.Gated Blood-Pool Imaging: Radionuclide ventriculography where scintigraphic data is acquired during repeated cardiac cycles at specific times in the cycle, using an electrocardiographic synchronizer or gating device. Analysis of right ventricular function is difficult with this technique; that is best evaluated by first-pass ventriculography (VENTRICULOGRAPHY, FIRST-PASS).Acanthaceae: A plant family of the order Lamiales. It is characterized by simple leaves in opposite pairs, cystoliths (enlarged cells containing crystals of calcium carbonate), and bilaterally symmetrical and bisexual flowers that are usually crowded together. The common name for Ruellia of wild petunia is easily confused with PETUNIA.Dictionaries, MedicalDictionaries as Topic: Lists of words, usually in alphabetical order, giving information about form, pronunciation, etymology, grammar, and meaning.Dictionaries, ChemicalTerminology as Topic: The terms, expressions, designations, or symbols used in a particular science, discipline, or specialized subject area.Atrioventricular Node: A small nodular mass of specialized muscle fibers located in the interatrial septum near the opening of the coronary sinus. It gives rise to the atrioventricular bundle of the conduction system of the heart.Tachycardia, Atrioventricular Nodal Reentry: Abnormally rapid heartbeats caused by reentry of atrial impulse into the dual (fast and slow) pathways of ATRIOVENTRICULAR NODE. The common type involves a blocked atrial impulse in the slow pathway which reenters the fast pathway in a retrograde direction and simultaneously conducts to the atria and the ventricles leading to rapid HEART RATE of 150-250 beats per minute.Tachycardia, Ectopic Junctional: A rare form of supraventricular tachycardia caused by automatic, not reentrant, conduction initiated from sites at the atrioventricular junction, but not the ATRIOVENTRICULAR NODE. It usually occurs during myocardial infarction, after heart surgery, or in digitalis intoxication with a HEART RATE ranging from 140 to 250 beats per minute.Heart Block: Impaired conduction of cardiac impulse that can occur anywhere along the conduction pathway, such as between the SINOATRIAL NODE and the right atrium (SA block) or between atria and ventricles (AV block). Heart blocks can be classified by the duration, frequency, or completeness of conduction block. Reversibility depends on the degree of structural or functional defects.Bundle of His: Small band of specialized CARDIAC MUSCLE fibers that originates in the ATRIOVENTRICULAR NODE and extends into the membranous part of the interventricular septum. The bundle of His, consisting of the left and the right bundle branches, conducts the electrical impulses to the HEART VENTRICLES in generation of MYOCARDIAL CONTRACTION.Mild Cognitive Impairment: A prodromal phase of cognitive decline that may precede the emergence of ALZHEIMER DISEASE and other dementias. It may include impairment of cognition, such as impairments in language, visuospatial awareness, ATTENTION and MEMORY.Alzheimer Disease: A degenerative disease of the BRAIN characterized by the insidious onset of DEMENTIA. Impairment of MEMORY, judgment, attention span, and problem solving skills are followed by severe APRAXIAS and a global loss of cognitive abilities. The condition primarily occurs after age 60, and is marked pathologically by severe cortical atrophy and the triad of SENILE PLAQUES; NEUROFIBRILLARY TANGLES; and NEUROPIL THREADS. (From Adams et al., Principles of Neurology, 6th ed, pp1049-57)Cognition Disorders: Disturbances in mental processes related to learning, thinking, reasoning, and judgment.Atrophy: Decrease in the size of a cell, tissue, organ, or multiple organs, associated with a variety of pathological conditions such as abnormal cellular changes, ischemia, malnutrition, or hormonal changes.Hippocampus: 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.Magnetic Resonance Imaging: 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.PubMed: A bibliographic database that includes MEDLINE as its primary subset. It is produced by the National Center for Biotechnology Information (NCBI), part of the NATIONAL LIBRARY OF MEDICINE. PubMed, which is searchable through NLM's Web site, also includes access to additional citations to selected life sciences journals not in MEDLINE, and links to other resources such as the full-text of articles at participating publishers' Web sites, NCBI's molecular biology databases, and PubMed Central.Periodicals as Topic: A publication issued at stated, more or less regular, intervals.BooksPublishing: "The business or profession of the commercial production and issuance of literature" (Webster's 3d). It includes the publisher, publication processes, editing and editors. Production may be by conventional printing methods or by electronic publishing.MEDLINE: The premier bibliographic database of the NATIONAL LIBRARY OF MEDICINE. MEDLINE® (MEDLARS Online) is the primary subset of PUBMED and can be searched on NLM's Web site in PubMed or the NLM Gateway. MEDLINE references are indexed with MEDICAL SUBJECT HEADINGS (MeSH).Serial Publications: Publications in any medium issued in successive parts bearing numerical or chronological designations and intended to be continued indefinitely. (ALA Glossary of Library and Information Science, 1983, p203)Biological Science Disciplines: All of the divisions of the natural sciences dealing with the various aspects of the phenomena of life and vital processes. The concept includes anatomy and physiology, biochemistry and biophysics, and the biology of animals, plants, and microorganisms. It should be differentiated from BIOLOGY, one of its subdivisions, concerned specifically with the origin and life processes of living organisms.ArchivesSomatosensory Cortex: 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.Evoked Potentials, Somatosensory: The electric response evoked in the CEREBRAL CORTEX by stimulation along AFFERENT PATHWAYS from PERIPHERAL NERVES to CEREBRUM.Directories as Topic: Lists of persons or organizations, systematically arranged, usually in alphabetic or classed order, giving address, affiliations, etc., for individuals, and giving address, officers, functions, and similar data for organizations. (ALA Glossary of Library and Information Science, 1983)Encyclopedias as Topic: Works containing information articles on subjects in every field of knowledge, usually arranged in alphabetical order, or a similar work limited to a special field or subject. (From The ALA Glossary of Library and Information Science, 1983)EncyclopediasBrain Waves: Wave-like oscillations of electric potential between parts of the brain recorded by EEG.Copyright: It is a form of protection provided by law. In the United States this protection is granted to authors of original works of authorship, including literary, dramatic, musical, artistic, and certain other intellectual works. This protection is available to both published and unpublished works. (from Circular of the United States Copyright Office, 6/30/2008)Academies and Institutes: Organizations representing specialized fields which are accepted as authoritative; may be non-governmental, university or an independent research organization, e.g., National Academy of Sciences, Brookings Institution, etc.Biomedical Research: Research that involves the application of the natural sciences, especially biology and physiology, to medicine.Writing: The act or practice of literary composition, the occupation of writer, or producing or engaging in literary work as a profession.National Human Genome Research Institute (U.S.): Component of the NATIONAL INSTITUTES OF HEALTH. It conducts and supports research into the mapping of the human genome and other organism genomes. The National Center for Human Genome Research was established in 1989 and re-named the National Human Genome Research Institute in 1997.Brain Diseases: 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.

Effect of illuminance and color temperature on lowering of physiological activity. (1/272)

To investigate how illuminance and color temperature in illumination affect the autonomic nervous system and central nervous system in conditions tending to lower physiological activity, and with an ordinary residential setting in mind, we performed an experiment on 8 healthy male subjects. The experimental conditions consisted of 4 conditions provided by a combination of 2 levels of color temperature (3000 K, 5000 K) and 2 levels of illuminance (30 lx, 150 lx). Physiological measurement was carried out during a process of 22 minutes of light exposure followed by 20 minutes of sleep in darkness. Heart rate variability (HRV) was used as an index of the autonomic nervous system, and alpha attenuation coefficient (AAC) and mean frequency of EEG were used as indices of the central nervous system. Subjective evaluation of drowsiness during the experiment was also carried out immediately following the 20 minutes sleep. No effect on HRV from illumination was noted, but significantly (p < 0.05) lower values for AAC were obtained under 3000 K conditions than 5000 K conditions in measurements during the first half of light exposure (Session 1). During alpha attenuation testing, significantly (p < 0.05) lower values for mean frequency in the theta-beta EEG bandwidth were also obtained under 3000 K conditions than 5000 K conditions, but that pattern persisted in measurement during the second half of light exposure (Session 2). Subjective drowsiness was also higher under 3000 K conditions than 5000 K conditions. These results suggest that low color temperature light creates a smooth lowering of central nervous system activity, and that low color temperature illumination can be used effectively in a bedroom or other such environment where it is desirable to facilitate lowered physiological activity.  (+info)

Effect of wake-sleep transitions and rapid eye movement sleep on pharyngeal muscle response to negative pressure in humans. (2/272)

1. Genioglossus (GG) activation in response to upper airway negative pressure may be an important mechanism in the maintenance of airway patency. This reflex occurs during wakefulness but is diminished during stable non-rapid eye movement (NREM) sleep. Since obstructive events occur more commonly at wake-sleep transitions and during rapid eye movement (REM) sleep than during stable NREM sleep, we assessed the GG reflex during these two vulnerable states. 2. Seventeen healthy adults were studied throughout one evening and overnight. Electroencephalograms (EEGs), electro-oculograms (EOGs), submental electromyogram (EMG), GG EMG (intramuscular electrodes), and choanal plus epiglottic pressures were recorded. The GG reflex response to pulses of -8 cmH2O choanal pressure applied via nose mask during early inspiration was quantified repeatedly during relaxed wakefulness, within five breaths of wake-sleep transition (EEG alpha-theta transition) and during REM sleep. Only trials without EEG arousal were analysed, resulting in data from 14 subjects during sleep onset and 10 subjects during REM sleep (overall, 174-491 trials per state). 3. During wakefulness there was brisk GG reflex activation in response to negative pressure (amplitude: +78.5 +/- 28.3 % baseline (mean +/- s.e.m.); latency to maximal response: 177 +/- 16 ms). 4. At sleep onset, although there was marked variability among individuals, there was no significant reduction in the magnitude of the GG reflex for the group as a whole (amplitude: +33.2 +/- 8.2 % baseline; latency: 159 +/- 15 ms). 5. In contrast, during REM sleep there was a reduction of GG reflex (amplitude: -12.6 +/- 8.3 % baseline (P = 0.017 vs. awake); latency: 160 +/- 10 ms (n.s. vs. awake)) and greater airway collapsibility during the applied pressures (P = 0.043 vs. awake). 6. We conclude that there was no systematic reduction in the GG reflex to negative pressure at sleep onset. Nonetheless, it remains possible that sleep-deprived normal subjects and patients with sleep apnoea could react differently. 7. The apparent inhibition of the GG reflex during REM sleep may help explain why the upper airway is vulnerable to collapse during this state.  (+info)

Investigation of nonlinear ECoG changes during spontaneous sleep state changes and cortical arousal in fetal sheep. (3/272)

We examined the processes of cortical activation and deactivation of the fetal brain during spontaneous sleep state transitions and during central nervous processing of vibroacoustic stimulations (VASs) using nonlinear analysis of the electrocorticogram (ECoG). Tests of nonlinearity and a random shuffling routine revealed deterministic and nonlinear portions in the fetal ECoG. As common nonlinear measures are not applicable to nonstationary time series, we developed an algorithm to estimate the predictability of the ECoG in its time course by means of a point prediction error (PPE). The ECoG was recorded before and during VAS from the maternal abdominal surface in seven chronically instrumented fetal sheep at 0.8 of gestation. The PPE during REM sleep was significantly higher than during NREM sleep. VAS in NREM sleep resulted in an abrupt increase of the PPE not reaching the level of REM sleep. The steep increase of the PPE at onset and its slow decrease after cessation of the stimulus were very similar to the dynamics of spontaneous sleep state transitions, suggesting the involvement of the same cortical activating mechanisms. In conclusion, the stage and the time course of fetal brain activation and deactivation patterns can be clearly shown by PPE techniques. The PPE is a useful complement to spectral analysis. Both techniques describe different properties of the ECoG.  (+info)

Anticipatory biasing of visuospatial attention indexed by retinotopically specific alpha-band electroencephalography increases over occipital cortex. (4/272)

Alpha-band (8-14 Hz) oscillatory EEG activity was examined with high-density scalp electrical recording during the cue-stimulus interval of an endogenous spatial cueing paradigm. In different blocks, cued spatial locations (left or right) were in either the upper or lower visual field, and attended stimuli were either oriented Ts or moving dots. Distractor stimuli were equally likely in the uncued hemifield. Sustained focal increases of alpha-band activity were seen over occipital cortex contralateral to the direction of the to-be-ignored location (ipsilateral to the cued direction of attention) before onset of the to-be-attended stimulus. The focus of alpha-band activity also moved depending on whether cued locations were in the upper or lower field. Results are consistent with active gating of uncued spatial locations.  (+info)

Oscillatory cortical activities in the gamma band in the human EEG induced by visual stimuli--representation of the stimulus? (5/272)

The present work presents three experiments investigating cortical activities in the gamma band in humans. On the basis of theoretical models and animal experiments, synchronized oscillatory neuronal activity is discussed as the key mechanism by which the brain binds information processesed in different cortical areas to form a percept. Using an identical stimulation design--the same as used in animal studies--it was shown that induced gamma band responses in the EEG resemble the same features as those found in the intracortical recordings of animals. In addition, the present work demonstrates that these cortical activities are not higher harmonics of the alpha band and that they are sensitive to the features of the stimulus. These results support the notion that gamma band activity is not just a by-product of neuronal activity and that alpha- and gamma band activities most certainly represent different cortical functional states.  (+info)

Nonlinearity in human resting, eyes-closed EEG: an in-depth case study. (6/272)

The question of nonlinearity in the human electroencephalogram (EEG) is important, since linear methods of EEG analysis are more well-developed and computationally faster than nonlinear methods. Furthermore, the presence or absence of nonlinearity has important theoretical implications for understanding the nature of the brain's oscillatory activity. Using a linear summary measure as a control, we report a failure to reject the null hypothesis of a (largely) stationary linear-Gaussian process for normal, resting, eyes-closed EEG from a single participant. We found significant evidence of nonlinearity at two occipital sites (O1 and O2) where the 8-12.5 Hz alpha rhythm was prominent. However, this element of nonlinear structure appeared trivial, as (1) we found no evidence of time irreversibility at these loci, and (2) best-fitting linear models accounted on-average for over 94% of the variance in the data with nonlinear modeling doing no better. Half of the remaining variance could be accounted for by nonstationarity. While our findings technically apply only to the one individual tested, his EEG was typical of those seen under the conditions that we employed.  (+info)

The role of the thalamic reticular neurons in alpha- and gamma-oscillations in neocortex: a mechanism for selective perception and stimulus binding. (7/272)

The long-term objective is to understand how large masses of neurons in the brain process information during various learning and memory paradigms. Both time- and space-dependent processes have been identified in animals through computer-based analytic quantifications of event-related extracellular potentials. New nonlinear analyses have been introduced that presume that the fine-grain variation in the signal is determined and patterned in phase-space. Some neurons in the primary visual cortex manifest gamma-band oscillations. These cells show both a nonspecific phase-alignment (response synchrony) and a specific tuning (orientation tuning) when stimuli are presented to their receptive fields. This dual regulation of the sensory cells is proposed to underlie stimulus binding, a theoretical mechanism for "object" perception. Nonlinear analytic results from gamma-activities in a simple model neuropil (olfactory bulb) suggest that neuroplasticity may arise through self-organization, a process in which a nonlinear change in the dynamics of the oscillatory field potentials is the hallmark. This self-organization may follow simple dynamical laws in which global cooperativity among the neurons is transiently brought about that, over trials, results in enduring changes in the nonlinear dynamics of some neurons. In conclusion, the sculpturing of the synaptic throughput in the sensory cortex (stimulus binding) may be associated with the irregular phases of the gamma-activities and may result from both specific and nonspecific systems operating together in a nonlinear self-organizing manner.  (+info)

Neurophysiological measures of working memory and individual differences in cognitive ability and cognitive style. (8/272)

The capacity to deliberately control attention in order to hold and manipulate information in working memory is critical to higher cognitive functions. This suggests that between-subject differences in general cognitive ability might be related to observable differences in the activity of brain systems that support working memory and attention control. To test this notion, electroencephalograms were recorded from 80 healthy young adults during spatial working memory tasks. Measures of task-related neurophysiological and behavioral variables were derived from these data and compared to scores on a test battery commonly used to assess general cognitive ability (the WAIS-R). Subjects who scored high on the psychometric test also tended to respond faster in the experimental tasks without any loss of accuracy. The amplitude of the late positive component of the event-related potential was larger in high-ability subjects, and the frontal midline theta component of the EEG signal was also selectively enhanced in this group under conditions of sustained performance and high working memory load. These results suggest that subjects who scored high on the WAIS-R were better able to focus and sustain attention to task performance. Changes in the EEG alpha rhythm in response to manipulations of task practice and load were also examined and compared between frontal and parietal regions. The results indicated that high-ability subjects developed strategies that made relatively greater use of parietal regions, whereas low-ability subjects relied more exclusively on frontal regions. Other analyses indicated that hemispheric asymmetries in alpha band measures distinguish between individuals with relatively high verbal aptitude and those with relatively high nonverbal aptitude. In particular, subjects with a verbal cognitive style tended to make greater use of the left parietal region during task performance, and subjects with a nonverbal style tended to make greater use of the right parietal region. These results help clarify relationships between task-related brain activity and individual differences in cognitive ability and style.  (+info)

Studies exploring the role of neural oscillations in cognition have revealed sustained increases in alpha-band power during the delay period of verbal and visual working memory (VWM) tasks. There have been various proposals regarding the functional significance of such increases, including the inhibition of task-irrelevant cortical areas as well as the active retention of information in VWM. The present study examines the role of delay-period alpha-band power in mediating the effects of interference arising from on-going visual processing during a concurrent VWM task. Specifically, we reasoned that, if set-size dependent increases in alpha-band power represent the gating out of on-going task-irrelevant visual inputs, they should be predictive with respect to some modulation in visual evoked potentials resulting from a task-irrelevant delay period probe stimulus. In order to investigate this possibility, we recorded the electroencephalogram while subjects performed a change detection task requiring the
Atrophy of hippocampus and alteration of resting eyes-closed electroencephalographic (EEG) rhythms represent important features of mild cognitive impairment (MCI) and Alzheimers disease (AD). Here we evaluated linear and non-linear aspects of the relationship between these features in the continuum along MCI and AD conditions, as a reflection of neurodegenerative processes. Eyes-closed resting EEG data were recorded in 60 healthy elderly (Nold), 88MCI, and 35 Alzheimers disease (AD) patients. Hippocampal volumewasmeasured in magnetic resonance imaging of the MCI and AD subjects. Based on the normalized hippocampal volume, selected MCI subjects could be divided into two demographically paired sub-groups: those with larger hippocampal volume (MCI +h; N=40; mini mental state evaluation - MMSE - score=27.5±0.26 SE) and those with smaller hippocampal volume (MCI −h; N=40; h; MMSE=26.5±0.34 SE); the normalized hippocampal volume was statistically greater in the MCI +h than in the MCI −h and AD ...
Define alpha alpha wave. alpha alpha wave synonyms, alpha alpha wave pronunciation, alpha alpha wave translation, English dictionary definition of alpha alpha wave. n. 1. The first letter of the Greek alphabet. See Table at alphabet. 2. The first of a series; the beginning. 3. Astronomy The brightest star in a...
Hypnotizability is a cognitive multidimensional trait that involves peculiar imagery characteristics. Subjects with high- (Highs) and low (Lows)-susceptibilities to hypnosis have shown different levels of skill at visual and somesthetic-guided imageries performed during upright stance. The aim of this experiment is to study the modulation of the EEG alpha and theta band amplitude during guided visual and somesthetic imageries in Highs and Lows, as these rhythms are responsive to the cognitive activities involved in mental imagery. Our results show that, at variance with standing subjects, subjects in both groups in a semi-reclined position report higher vividness and lower effort for visual than for somesthetic imagery. EEG patterns however are different between the two groups. Highs exhibit a more widespread alpha desynchronization and slightly different EEG patterns during visual and somesthetic imageries, while Lows show segregated alpha- and theta-desynchronization, without any difference between
This paper presents a new approach to investigate the spatial correlation of brain alpha activity in functional magnetic resonance imaging (fMRI) and electroencephalography (EEG). To avoid potential problems of simultaneous fMRI and EEG acquisitions in imaging brain alpha activity, data from each modality were acquired separately under a "three conditions" setup where one of the conditions involved closing eyes and relaxing, thus making it conducive to generation of alpha activity. The other two conditions -- eyes open in a lighted room or engaged in a mental arithmetic task, were designed to attenuate alpha activity. Using the Mixture Density Independent Component Analysis (MD-ICA) that incorporates flexible non-linearity functions into the conventional ICA framework, we could identify the spatiotemporal components of fMRI activations and EEG activities associated with the alpha rhythm. The sources of the individual EEG alpha activity component were localized by a Maximum Entropy (ME) method ...
The article deals with the study of bioelectric activity of the brain in patients with various forms of migraine, complicated by status migrainosus. The EEG-mapping was performed for 32 patients with diff erent forms of migraine. The EEG registration was carried out between the attacks. Patients were calm and active and performed functional tests. The following frequency ranges were analyzed: delta rhythm, theta rhythm, alpha rhythm, beta rhythm. The spectral powers of the rhythms in the frontal, parietal, temporal, occipital regions of the cerebral hemispheres were evaluated. The results of EEG-mapping showed that patients with diff erent forms of migraine demonstrated a decrease in reactivity of the cerebral cortex as per fast-wave indices, which was even more prominent in a group of patients with migraine without aura, as well as the activation of slow-wave activity in these patients. Analysis of the data of cartograms shows that activation of slow-wave ranges and alpha frequency inhibition ...
Temporal expectations have been shown to enhance visual analysis of task-relevant events, especially when these are coupled with spatial expectations. Oscillatory brain activity, particularly in the alpha band, has been implicated in regulating excitability in visual areas as a function of anticipatory spatial attention. Here we asked whether temporal expectations derived from regular, rhythmic events can modulate ongoing oscillatory alpha-band activity, so that the changes in cortical excitability are focused over the time intervals at which target events are expected. The task we used involved making a perceptual discrimination about a small target stimulus that reappeared from behind a peripheral occluding band. Temporal expectations were manipulated by the regular, rhythmic versus irregular, arrhythmic approach of the stimulus toward the occluding band. Alpha-band activity was measured during the occlusion period, in which no stimulus was presented, but target reappearance was anticipated in
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 ...
In a recent study (Long-term stability in childrens frontal EEG alpha asymmetry between 14-months and 83-months, we measured resting state alpha EEG in children at two measurement points.
The relationship between the electro-encephalographic (EEG) alpha and beta oscillations in the resting condition was investigated in the study. EEGs were recorded in 33 subjects, and alpha (7.5-12.5Hz) and beta (15-25Hz) oscillations were extracted with the use of a modified wavelet transform. Power, peak frequency and phase synchronisation were evaluated for both types of oscillation. The average beta-alpha peak frequency ratio was about 1.9-2.0 for all electrode derivations. The peak frequency of beta activity was within 70-90 % of the 95 % confidence interval of twice the alpha frequency. A significant (p , 0.05) linear regression was found between beta and alpha power in all derivations in 32 subjects, with the slope of the regression line being approximate to 0.3. There was no significant difference in the slope of the line in different electrode locations, although the power correlation was strongest in the occipital locations where alpha and beta oscillations had the largest power. A ...
Mary Brazier (1961) has described the work of the German psychiatrist Hans Berger as the triumph of a man working with equipment that was inadequate even by the standards of his day. Like Caton, Berger attempted to record electrical responses to sensory stimuli in animals, although it seems that the work he did between 1902 and 1910 was in general unsuccessful. In 1924 he turned to the measurement of human electrical potentials but delayed publication of his results until 1929, when the first recorded electroencephalogram (of his young son) appeared in Archiv forschung Psychiatrie.. Berger discovered alpha rhythm, running at 10 cycles per second (hertz or Hz). He found that this disappeared if the eyes were opened, with mental effort such as doing mental arithmetic (with the eyes closed) and with loud noises or painful stimuli. Bergers work was disregarded by physiologists partly ecause it was published in psychiatric journals, and perhaps because of his reputation for eccentricity, ...
Normal EEG waves. (a) The alpha rhythm in the waking record blocks at eye opening; eyes opened at A and closed at B. (b) A light-sleep EEG has theta waves and a sleep hump at C and spindles at D. (c) Deep sleep reveals constant, irregular slow delta ...
People with greater frontal alpha asymmetry are less able to regulate strong, emotional, affective states, such as anger, in their dreams.
Brain oscillations such as alpha waves in relaxed wakefulness, sleep spindles and slow oscillations in sleep, or beta and gamma oscillations are important markers for the brain state and may also play functional roles in some cognitive processes. The different names indicate that they are considered as distinct entities, with frequency and topography being the features that distinguish the two. Sleep spindles in the human EEG, for instance, are oscillations in a frequency range between 11 and 16 Hz. They were shown to be related to the memory consolidating effects of sleep [1]. One often distinguishes between slow and fast spindles, which supposedly serve different functional purposes. Both types of spindles have not only different frequencies, but also different topographical distributions in the scalp EEG. The distinction between slow and fast sleep spindles in measured data is, however, by no means simple and uncontroversial. This is primarily due to the large amount of variation in the ...
Top-down mediated decreases of beta activity in auditory cortex prior to a predictable distractor in an auditory working memory task is associated with increased representation of to-be-memorized information.
Author: Kirschfeld, K; Genre: Journal Article; Published in Print: 2008-06; Title: Relationship between the amplitude of alpha waves and reaction time
Celestial Chronicles is a music studio album recording by ALPHA WAVE MOVEMENT (Progressive Electronic/Progressive Rock) released in 2014 on cd, lp / vinyl and/or cassette. This page includes Celestial Chronicless : cover picture, songs / tracks list, members/musicians and line-up, different releases details, free MP3 download (stream), buy online links: ebay and amazon, ratings and detailled reviews by our experts, collaborators and members.
Kinetic is a music studio album recording by ALPHA WAVE MOVEMENT (Progressive Electronic/Progressive Rock) released in 2016 on cd, lp / vinyl and/or cassette. This page includes Kinetics : cover picture, songs / tracks list, members/musicians and line-up, different releases details, free MP3 download (stream), buy online links: ebay and amazon, ratings and detailled reviews by our experts, collaborators and members.
The over-arching hypothesis that drives my work is that neural dynamics, fluctuating on millisecond to second time scales, powerfully impact perception. In this thesis, I employ correlative electrophysiological recording methods and causal optogenetic control of neural circuits to systematically test the importance of dynamics in the expression of pre-stimulus oscillations on perception. Specifically, I test the prediction that alpha oscillations expressed in a given sensory representation within a neocortical map predict diminished sensory capability in that region of sensory space, while gamma oscillations predict enhanced capacity. My model system throughout is primary somatosensory neocortex and tactile perception: I combine studies from human and mouse to benefit from the relative merits of each preparation. Several prior studies support this more generally stated view of oscillatory dynamics -- alpha predicting diminished and gamma predicting enhanced perceptual capacity. However, there is ...
Question - 3 year old diagnosed with vision error. Will the power increase drastically?. Ask a Doctor about diagnosis, treatment and medication for Myopia, Ask an Ophthalmologist
(Medical Xpress) -- It has long been suspected that humans do not experience the world continuously, but rather in rapid snapshots.
If you examine the rise of a typical leader, the ability to look and listen decreases as power increases. Thats a trend you need to be aware of. At the outset, a future leader often rises out of a | this curious life
Enjoyed on 7/19/2011 Brewery: Boneyard Beer Location: Bend, OR Beer: Armored Fist Web: http://www.boneyardbeer.com/ Presentation: 64oz Growler Vintage: 2011 Style: Northwest Style Cascadian Dark Ale Barrel: N/A ABV: 10.0% IBU: 80 Hops: N/A Malt: N/A Commercial Description: Imperial Cascadian is the NW style of this brew. This is a very well balanced, extremely hoppy black […] … ...
In this study, the effect of Pilates training on the brain function was investigated through five case studies. Alpha rhythm changes during the Pilates training over the different regions and the whole brain were mainly analyzed, including power spectral density and global synchronization index (GSI). It was found that the neural network of the brain was more active, and the synchronization strength reduced in the frontal and temporal regions due to the Pilates training. These results supported that the Pilates training is very beneficial for improving brain function or intelligence. These findings maybe give us some line evidence to suggest that the Pilates training is very helpful for the intervention of brain degenerative diseases and cogitative dysfunction rehabilitation.
Looking for online definition of alpha wave in the Medical Dictionary? alpha wave explanation free. What is alpha wave? Meaning of alpha wave medical term. What does alpha wave mean?
Recent studies have investigated local oscillations, long-range connectivity, and global network patterns to identify neural changes associated with anesthetic-induced unconsciousness. These studies typically employ anesthetic protocols that either just cross the threshold of unconsciousness, or induce deep unconsciousness for a brief period of time-neither of which models general anesthesia for major surgery. To study neural patterns of unconsciousness and recovery in a clinically-relevant context, we used a realistic anesthetic regimen to induce and maintain unconsciousness in 8 healthy participants for three hours. High-density electroencephalogram (EEG) was acquired throughout and for another three hours after emergence. Seven epochs of 5-minute eyes-closed resting states were extracted from the data at baseline as well as 30, 60, 90, 120, 150 and 180 minutes post-emergence. Additionally, 5-minute epochs were extracted during induction, unconsciousness and immediately prior to recovery of
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The waking EEG is thought to be one of the most heritable physiologic signals, based on numerous studies in monozygotic and dizygotic twin pairs (Stassen et al. 1987; van Beijsterveldt et al. 1996). Moreover, between‐subject differences in spectral power are stable across weeks or months, assessed across the major EEG frequency bands (Gasser et al. 1985; Pollock et al. 1991; Salinsky et al. 1991). In particular, strong individual differences in EEG alpha activity are observed when assessed in rested participants who have their eyes closed. Here, we demonstrate that between‐subject differences in delta, theta, alpha, and beta activity are reproducible across repeated exposures to sleep deprivation, assessed when participants were taking the PVT. After adjusting for individual differences at baseline, however, only EEG alpha power exhibited significant individual differences in response to sleep deprivation. These findings are consistent with a previous study in which the most reproducible EEG ...
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 ...
In this study, we aimed to explore the possibility of evaluating the attitudes of subjects as to whether they liked or disliked visually presented pictures. We measured magnetoencephalgraphic (MEG) responses and conducted a phase analysis of the specific alpha band frequency component. We gave ten subjects a questionnaire with images of animals prepared beforehand. We selected 30 pictures, from which 15 pictures were used as positive impression images (Good Images) and 15 pictures as negative impression images (Bad Images). The MEG responses were measured with a 122-channel magnetometer system. We obtained the power spectrum of MEG responses and carried out a phase analysis of the peak frequency of the alpha band. As a result, significant phase synchronicity was confirmed for the negative impression images.. ...
The evidence for other neurobehavioural effects in volunteer studies, such as the effects on brain electrical activity, cognition, sleep, hypersensitivity and mood, is less clear. Generally, such studies have been carried out at exposure levels below those required to induce the effects described above, and have produced evidence only of subtle and transitory effects at best. The conditions necessary to elicit such responses are not well-defined at present.. Despite some scattered field-dependent changes, most notably in the alpha frequency band, and with intermittent exposure perhaps more effective than continuous exposure, these studies have produced inconsistent and sometimes contradictory results.. Generally, while electrophysiological considerations suggest that the central nervous system is potentially susceptible to induced electric fields; cognitive studies have not revealed any clear, unambiguous finding.. There is some evidence suggesting the existence of field-dependent effects on ...
The neural correlates of the wake-sleep continuum remain incompletely understood, limiting the development of adaptive drug delivery systems for promoting sleep maintenance. The most useful measure for resolving early positions along this continuum is the alpha oscillation, an 8-13 Hz electroencephalographic rhythm prominent over posterior scalp locations. The brain activation signature of wakefulness, alpha expression discloses immediate levels of alertness and dissipates in concert with fading awareness as sleep begins. This brain activity pattern, however, is largely ignored once sleep begins. Here we show that the intensity of spectral power in the alpha band actually continues to disclose instantaneous responsiveness to noise-a measure of sleep depth-throughout a night of sleep. By systematically challenging sleep with realistic and varied acoustic disruption, we found that sleepers exhibited markedly greater sensitivity to sounds during moments of elevated alpha expression. This result
Pharmacology - Glucocorticoids have effects on virtually every cell type and system in mammals. An overview of the effects of these agents follows:. Cardiovascular System: Glucocorticoids can reduce capillary permeability and enhance vasoconstriction. A relatively clinically insignificant positive inotropic effect can occur after glucocorticoid administration. Increased blood pressure can result from both the drugs vasoconstrictive properties and increased blood volume that may be produced.. Cells: Glucocorticoids inhibit fibroblast proliferation, macrophage response to migration inhibiting factor, sensitization of lymphocytes and the cellular response to mediators of inflammation. Glucocorticoids stabilize lysosomal membranes.. CNS/Autonomic Nervous System: Glucocorticoids can lower seizure threshold, alter mood and behavior, diminish the response to pyrogens, stimulate appetite and maintain alpha rhythm. Glucocorticoids are necessary for normal adrenergic receptor sensitivity.. Endocrine ...
The above is a representation of the electrical activity of the brain by frequency after 20 minutes of use of Alpha-Stim CES at 0.5 Hz. The EEG of 30 research volunteers was averaged and analyzed by computer to generate the average of brain changes in brain activity after 20 minutes of Alpha-Stim. This is a difference brain map, where a decrease in activity after the use of Alpha-Stim is shown in shades of blue and an increase in activity is seen in shades of yellow and red (green indicates no change). The above map shows that there is a decrease in delta, the 1, 2, and 3 Hz frequencies associated in waking individuals with impaired cognitive functioning. Significant increases are seen in alpha frequencies with peak activity at 9 Hz. Increases were also seen in activity at 12, 13 and 14 Hz, with 13 and 14 Hz activity centering on C3. It is common practice in EEG biofeedback (Neurotherapy) to train increases of 13-15 Hz activity (SMR) at C3 to create increased relaxation and treat epilepsy, ADHD, ...
6-Time National Best Selling Audio Author, Kelly Howell has helped millions to explore and experience meditation. Alpha waves are harmonically layered in soothing music to relieve tension, promote relaxation, creativity, and states of well-being. This recording is a profoundly nurturing guided meditation to relieve stress.
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Majority of people in this world take the help of medicines like Ritalin and Adderall for managing illnesses like ADHD and ADD. The advantage of these medicines is that focus power increases along with concentration helping with different tasks.
In order to understand the working brain as a network, it is essential to identify the mechanisms by which information is gated between regions. We here propose that information is gated by inhibiting task-irrelevant regions, thus routing information to task-relevant regions. The functional inhibiti …
مقاله ISI انگلیسی شماره 77710 - ترجمه نشده - موضوع : واقعیت مجازی - 7 صفحه - سال انتشار : 2015 - منبع : الزویر ساینس دایرکت
در طبقه‌بندی داده‌ها انتخاب فضای ویژگی متناسب با ماهیت پدیده و قدرت تفکیک بالا بسیار حائز اهمیت است. قابلیت نگاشت‌ بازگشتی در تحلیل دادگان غیرایستا موجب می‌شود در تشخیص حملات صرعی نیز مورد توجه قرار گیرد. در این پژوهش به تشخیص حملات صرعی توسط آنالیز کمی‌سازی بازگشتی بر پایه ترکیب الگوریتم ژنتیک و طبقه‌بند بیزین ‌پرداخته شده است. در ابتدا نگاشت بازگشتی سیگنال EEG دو گروه صرعی و نرمال هریک شامل 100 نمونه، بازای پنج نوع معیار فاصله (ماکزیمم فاصله، مینیمم فاصله، اقلیدوسی، ماهالانوبیس، منهتن) و 10 حد آستانه(ε) مختلف تشکیل و بهترین مجموعه ویژگی‌ بازای 50 تکرار
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 ...
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 ...
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
TY - JOUR. T1 - Genome-wide association analysis links multiple psychiatric liability genes to oscillatory brain activity. AU - Smit, Dirk J.A.. AU - Wright, Margaret J.. AU - Meyers, Jacquelyn L.. AU - Martin, Nicholas G.. AU - Ho, Yvonne Y.W.. AU - Malone, Stephen M.. AU - Zhang, Jian. AU - Burwell, Scott J.. AU - Chorlian, David B.. AU - de Geus, Eco J.C.. AU - Denys, Damiaan. AU - Hansell, Narelle K.. AU - Hottenga, Jouke Jan. AU - McGue, Matt. AU - van Beijsterveldt, Catharina E.M.. AU - Jahanshad, Neda. AU - Thompson, Paul M.. AU - Whelan, Christopher D.. AU - Medland, Sarah E.. AU - Porjesz, Bernice. AU - Lacono, William G.. AU - Boomsma, Dorret I.. N1 - © 2018 The Authors Human Brain Mapping Published by Wiley Periodicals, Inc.. PY - 2018/11. Y1 - 2018/11. N2 - Oscillatory activity is crucial for information processing in the brain, and has a long history as a biomarker for psychopathology. Variation in oscillatory activity is highly heritable, but current understanding of specific ...
Results from research by Dr. Victor Rosenfeld published in the Journal of Clinical Neurophysiology give interesting insights into sleep irregularities in people with fibromyalgia. He found that 45% of the FM group had obstructive sleep apnea, and significant differences were present in the qEEG ratio of delta to alpha frequency power, which was 95% specific for fibromyalgia.
Shifts of covert visual attention induce changes in alpha power over posterior electrode sites. Initial analyses revealed that an early desynchronization was of little discriminative value regarding the direction of attention shifts. We believe that this early desynchronization may be related to the preparation of covert attention shifts. A subsequent synchronization, however, yielded distinctive topographic patterns for the different directions and served as a basis for classification.. Using regularized logistic regression, significant binary classification performance was obtained for each participant, with a mean accuracy of 73.65% for the best pair of directions. A classification accuracy of 70% was proposed as performance threshold above which BCI performance can be considered as robust [32, 33]. In the present study, six participants had a peak performance above 70%, and two participants had a performance that was slightly lower (66% and 69%). Interestingly, this figure is close to the ...
Essential oils stimulates the powerful sense of smell. It is known that odors we smell have a significant impact on how we feel. Studies with brain wave frequency has shown that smelling lavender increases alpha waves in the back of the head, which are associated with relaxation. Fragrance of Jasmine increases beta waves in the front of the head, which are associated with a more alert state.
Listen to Alpha Wave Movement & Jim Cole Radio free online. Listen to free internet radio, sports, music, news, podcasts, talk, and audiobooks. Stream live events, live play-by-play NFL, MLB, NBA, NHL, college football, NCAA basketball, and Premier League matches. CNN, MSNBC, Fox News, ESPN, BBC, NPR.
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 ...
Background: Postoperative delirium may manifest in the immediate post-anaesthesia care period. Such episodes appear to be predictive of further episodes of inpatient delirium and associated adverse outcomes. Frontal electroencephalogram (EEG) findings of suppression patterns and low proprietary index values have been associated with postoperative delirium and poor outcomes. However, the efficacy of titrating anaesthesia to proprietary index targets for preventing delirium remains contentious. We aim to assess the efficacy of two strategies which we hypothesise could prevent post-anaesthesia care unit (PACU) delirium by maximising the alpha oscillation observed in frontal EEG channels during the maintenance and emergence phases of anaesthesia. Methods: This is a 2 × 2 factorial, double-blind, stratified, randomised control trial of 600 patients. Eligible patients are those aged 60 years or over who are undergoing non-cardiac, non-intracranial, volatile-based anaesthesia of expected duration of ...
Cohen D (1968). "Magnetoencephalography: evidence of magnetic fields produced by alpha rhythm currents". Science. 161: 784-6. ...
The brain's magnetic field, measuring at 10 femtotesla (fT) for cortical activity and 103 fT for the human alpha rhythm, is ... ISBN 9780205239399 pp 152-153 Cohen D. (1968). "Magnetoencephalography: evidence of magnetic fields produced by alpha rhythm ... "Altered temporal correlations in parietal alpha and prefrontal theta oscillations in early-stage Alzheimer disease". PNAS. 106 ...
"Dynamics of the human alpha rhythm: evidence for non-linearity?". Clin Neurophysiol. 110 (10): 1801-1813. doi:10.1016/S1388- ... well with the known phenomena of event related synchronization and desynchronization such as decrease of the activity in alpha ...
Lynch, J.; Paskewitz, D.; Orne, M. (1974). "Some Factors in the Feedback Control of Human Alpha Rhythm". Psychosomatic Medicine ... It is aimed to reach a level of "slow alpha" (8 Hz). Glickson (1986) states that an alpha frequency of 10 Hz is optimal for ... He assumes that it's the change in alpha activity and not the alpha activity itself that is facilitating an altered state of ... The development of alpha EEG feedback (see neurofeedback) is an important starting point for biofeedback and its explicit use ...
With the development of the EEG, Adrian and Matthews published their results showing that the alpha rhythm could be "driven" ... Toman, J. (1941) Flicker potentials and the alpha rhythm in man. Journal of Neurophysiology, 4, 51-61. Barlow, J. (1960) ... In his view, the rhythms of the lamp interacted with the rhythms of the brain's electrical activity to produce a complex ... Visual entrainment alone, in the alpha frequency range (7-10 Hz), has been shown to easily induce hypnosis, and it has been ...
... on Alpha and Oranges) For Madmen Only (1994) Penguin Dust (1997, Review: Cross Rhythms) Alpha and Oranges (1999, Reviews: The ... Figgis, Alex (June 1999). "Atomic Opera - Alpha & Oranges". Cross Rhythms (51). Bixler, David (July-August 2000). "Reviews: / ... Alpha and Oranges, and Penguin Dust) Jonas Velasco - bass, vocals (on For Madmen Only and Alpha and Oranges) Jonathan Marshall ... While working on new material, Hart compiled the album Alpha and Oranges, a collection of unreleased demos originally from the ...
Journal of Neuroscience 30(35):11670-7 Ritter, P., Moosmann, M., Villringer, A. (2009). Rolandic alpha and beta EEG rhythms' ... Correlates of alpha rhythm in functional magnetic resonance imaging and near infrared spectroscopy. Neuroimage. 20(1):145-58 ... 1996), combined EEG / fMRI to show fMRI correlates of background rhythms (Moosmann et al. 2003, Ritter et al. 2009) and ...
ISBN 1-4411-4851-5. Articles Robinson, Daniel N. (1966). "Visual reaction time and the human alpha rhythm: The effects of ...
"JYP/ Alpha 2010 audition results". SEOUL RHYTHMS. April 15, 2011. Retrieved 13 October 2014. "Four Generations of Dancers: From ... Low accompanied her friend to participate in the Singapore leg of the JYP and Alpha Asean Region Audition held in 2010 by Alpha ... She was the leader of the Singaporean-South Korean-Japanese girl group, Skarf, under Alpha Entertainment. Born into a family of ...
"JYP/ Alpha 2010 audition results". SEOUL RHYTHMS. April 15, 2011. Retrieved 17 August 2012. "Korean-Singaporean girl group ... Alpha's Chief Executive Officer Alan Chan stated that the girls would be groomed together with other Koreans to form a girl ... On 28 May, the video teasers of each member of Skarf for the title song Luv Virus was released through Alpha Entertainment's ... Skarf (Korean: 스카프; stylized as SKarf) was a South Korean girl group formed by Alpha Entertainment. The meaning behind the ...
"JYP/ Alpha 2010 audition results". SEOUL RHYTHMS. April 15, 2011. Retrieved 13 October 2014. "Singaporean ex-K-pop star Ferlyn ... Ferlyn left Alpha Entertainment in 2015 and co-founded an independent record label and artist management company, GIF Music. On ... Before auditioning for Alpha Entertainment, she was a trainee at Ocean Butterflies International, where she did backup dancing ... After passing the audition by JYP & Alpha Entertainment, she debuted in Skarf, a four-member girl group with another ...
"Effects of levetiracetam vs topiramate and placebo on visually evoked phase synchronization changes of alpha rhythm in migraine ...
"Prolonged inhibition of presynaptic catecholamine synthesis with alpha-methyl-para-tyrosine attenuates the circadian rhythm of ... Alpha-methyl-p-tyrosine (AMPT) is a tyrosine hydroxylase enzyme inhibitor. Alpha-methyl-p-tyrosine (AMPT) is a non-endogenous ... Elimination Small amounts of metabolites (alpha-methyldopa and alpha-methyldopamine) were found after the administration of ... Ankenman, Ralph; Salvatore, Michael F. (2007). "Low Dose Alpha-Methyl-Para-Tyrosine (AMPT) in the Treatment of Dystonia and ...
Noise-driven harmonic oscillators realistically simulate alpha rhythm in the waking EEG as well as slow waves and spindles in ... dynamical control of alpha rhythms in relation to focal attention". Int J Psychophysiol. 43 (1): 25-40. doi:10.1016/S0167-8760( ... Oscillatory rhythms at 10 Hz have been recorded in a brain area called the inferior olive, which is associated with the ... These ongoing rhythms can change in different ways in response to perceptual input or motor output. Oscillatory activity may ...
With study of Alpha wave, also called Berger's rhythm in memory of Hans Berger, Singh undertook a training in electronics. In ...
Four simple periodic rhythms recorded in the EEG are alpha, beta, delta, and theta, which are distinguished by frequency and ...
... somatosensory attention and top-down modulation of cortical alpha rhythms in mindfulness meditation". Frontiers in Human ... Kerr, Catherine (2011). "Effects of mindfulness meditation training on anticipatory alpha modulation in primary somatosensory ... Somatosensory attention and cortical alpha modulation in mindfulness meditation" Mindfulness 2014, "Moving beyond mindfulness: ...
The study demonstrated a clear reduction in occipital lobe alpha wave and mu wave rhythms during social interaction. The ... The phi complex is a brain rhythm in the awake human brain that appears to serve various social functions. Phi is one of ... This new brain rhythm that we have discovered and termed the 'phi complex' actually distinguishes when you're socially ... several brain rhythms in the awake human brain that coordinate human behavior. "Phi" operates in the 10-Hz band (ten ...
Calvin proves to be a "diplodeviant", one of very few people whose zeta and alpha rhythms are in phase. McHarty suggests that ... The people who slept, mostly girls, are becoming known as "Zeta mutants" after a new "zeta" rhythm observable in their ...
... both convergent and divergent thinking produced significant desynchronization of the Alpha 1,2 rhythms.[7] Meanwhile, ...
Noise-driven harmonic oscillators realistically simulate alpha rhythm in the waking EEG as well as slow waves and spindles in ... dynamical control of alpha rhythms in relation to focal attention". International Journal of Psychophysiology. 43 (1): 25-40. ... Buszaki G (2006). Rhythms of the brain. Oxford University Press.. *^ Nyhus E, Curran T (June 2010). "Functional role of gamma ... a fast rhythm generated by individual spikes and a slower rhythm generated by the bursts. ...
In waking adults this state is commonly associated with alpha rhythm, whereas slower (theta and delta) rhythms are usually ... alpha (t-t')[c_{1}E(t')-c_{2}I(t')+P(t')]dt'} where α ( t ) {\displaystyle \alpha (t)} is the stimulus decay function, c 1 {\ ... alpha (t-t')[c_{3}E(t')-c_{4}I(t')+Q(t')]dt'\right\}} Time Coarse Graining τ d E ¯ d t = − E ¯ + ( 1 − r E ¯ ) S e [ k c 1 E ... alpha (t-t')[c_{1}E(t')-c_{2}I(t')+P(t')]dt'\right\}} I ( t + τ ) = [ 1 − ∫ t − r t I ( t ′ ) d t ′ ] S i { ∫ − ∞ t α ( t − t ...
Specific pre-target oscillatory (alpha rhythms) and transient activities occurring in posterior-lateral parietal cortex and ...
"Alpha Rhythm Roots - Bolon". www.alpharhythmroots.com. Retrieved 2016-09-26. Stone, Ruth M., ed. "West Africa: An Introduction ...
"Body Temperature Daily Rhythms of the Fat Jird Meriones crassus: Effects of Beta and Alpha Adrenergic Blockers." Journal of ...
Sighs, on the other hand, consist of a slow and large amplitude rhythm. Each type of rhythm is generated by the same neurons in ... They are found within the pre-BötC and act via alpha-1, alpha-2, and beta-noradrenergic mechanisms.NE induces ICAN-dependent ... This complex has been proven to be essential for the generation of respiratory rhythm in mammals. The exact mechanism of the ... Gasping is characterized by a rhythm that has faster rise, shorter bursts, and lower frequency. The pre-BötC is capable of ...
Alpha rhythm changes during the Pilates training over the different regions and the whole brain were mainly analyzed, including ... In this study, the alpha rhythm (8-13?Hz) in the EEG recordings was concentrated on. In order to detect the alpha rhythms ... the Pilates training could increase the power of the brain alpha rhythm and reduce the synchronization strength of alpha rhythm ... Effect of Pilates Training on Alpha Rhythm. Zhijie Bian. ,1 Hongmin Sun. ,2 Chengbiao Lu. ,1 Li Yao. ,3 Shengyong Chen. ,4 and ...
However knowledge about the functional relevance of the auditory alpha rhythm has remained scarce so far. Results from the ... However knowledge about the functional relevance of the auditory alpha rhythm has remained scarce so far. Results from the ... for the existence of an auditory alpha-like rhythm independent of visual or motor generators, something that is occasionally ... for the existence of an auditory alpha-like rhythm independent of visual or motor generators, something that is occasionally ...
... the normal alpha rhythm (8-13 Hz) in the occipital cortex disappears and a frontal alpha rhythm emerges. This spatial shift in ... In the frontal component an alpha rhythm emerges (Fig. 4A-D). Propofol acts on the frontal circuit to produce alpha in two ways ... thought to be the generators of awake alpha, fire at the alpha frequency, resulting in a peak at the alpha frequency in the ... 2009) Temporal framing of thalamic relay-mode firing by phasic inhibition during the alpha rhythm. Neuron 63:683-696, doi: ...
好悪画像呈示時におけるMEGの位相解析 [in Japanese] Phase Analysis of Alpha Rhythm of Magnetoencephalography During Visual Presentation of ... We obtained the power spectrum of MEG responses and carried out a phase analysis of the peak frequency of the alpha band. As a ... We measured magnetoencephalgraphic (MEG) responses and conducted a phase analysis of the specific alpha band
S06 EEG 2 Alpha Rhythms in the Occipital Lobe. Home , Curriculum , S06 EEG 2 Alpha Rhythms in the Occipital Lobe ... To examine differences in the level of alpha rhythm activity during mental arithmetic and hyperventilation, compared to the ... The system records and displays the raw EEG together with the alpha wave and alpha-RMS activity. Students compare baseline EEG ... Alpha wave activity and alpha-RMS waveforms are automatically filtered and displayed. ...
... alpha a rhythm explanation free. What is alpha a rhythm? Meaning of alpha a rhythm medical term. What does alpha a rhythm mean? ... Looking for online definition of alpha a rhythm in the Medical Dictionary? ... alpha (alpha) rhythm. (redirected from alpha a rhythm) al·pha (α) rhythm. (alfă ridhŭm) 1. A wave pattern in the ... Alpha a rhythm , definition of alpha a rhythm by Medical dictionary https://medical-dictionary.thefreedictionary.com/alpha+a+ ...
Alpha its not a simple idling rhythm lets look at alpha generators: The thalamic involvement in the generation of the alpha ... rhythm is being under-valued when looking at the LORETA images of alpha current source generators. ... Thalamic Involvement in the Generation of the Alpha Rhythms - ... Alpha" its not a simple idling rhythm" lets look at alpha ... The alpha power may come from the sources that LORETA identifies, but the thalamus is intimately involved in alpha rhythm ...
... view of ST-Mindfulnesss somatic focus as a form of training for optimizing attentional modulation of 7-14 Hz alpha rhythms ... that ST-Mindfulness enhanced attentional regulation of alpha in primary somatosensory cortex (SI). The framework allows us to ... that ST-Mindfulness enhanced attentional regulation of alpha in primary somatosensory cortex (SI). The framework allows us to ... a novel view of ST-Mindfulnesss somatic focus as a form of training for optimizing attentional modulation of 7-14 Hz alpha ...
Chronic caregiver-related stress linked to diurnal salivary alpha-amylase rhythms. Diurnal Salivary Alpha-Amylase Dynamics ... A 3-level unconditional linear spline model was fit to describe the typical sAA diurnal rhythms. Predictors were then added to ... Fewer ADS days were associated with a more flattened sAA diurnal rhythm. Additionally, greater daily care-related stressor ... Objective: The study examined diurnal regulation of salivary alpha-amylase (sAA) in association with daily stressors, adult day ...
The effect of mobile phone electromagnetic fields on the alpha rhythm of human electroencephalogram R.J. Croft 1 2 *, D.L. ... The effect of mobile phone electromagnetic fields on the alpha rhythm of human electroencephalogram R.J. Croft 1 2 *, D.L. ... Portada del sitio , Documentos , Estudios Científicos , The effect of mobile phone electromagnetic fields on the alpha rhythm ... The effect of mobile phone electromagnetic fields on the alpha rhythm of human electroencephalogram Bioelectromagnetics ...
The desynchronization of alpha and beta oscillations (mu rhythm) in the central scalp EEG during action observation and action ... The resting EEG spectrum of alpha (8-13 Hz) rhythm was measured in 22 healthy subjects who have used the Internet for ... EEG Correlates of the Flow State: A Combination of Increased Frontal Theta and Moderate Frontocentral Alpha Rhythm in the ... Functional cortical source connectivity of resting state electroencephalographic alpha rhythms shows similar abnormalities in ...
Effects of 2G and 3G mobile phones on human alpha rhythms: Resting EEG in adolescents, young adults, and the elderly. med./bio ... 2010): Mobile phone emission modulates inter-hemispheric functional coupling of EEG alpha rhythms in elderly compared to young ... 2008): The effect of mobile phone electromagnetic fields on the alpha rhythm of human electroencephalogram. ... 2007): Mobile phone emission modulates interhemispheric functional coupling of EEG alpha rhythms. ...
Could orienting attention to a selective point in time influence the alpha rhythms as a function of the SHORT vs. LONG ... In conclusion, temporal attention for a sub-second delay (800 ms) did modulate low-band alpha rhythm over large regions of both ... Compared to the LONG condition (foreperiod), the SHORT condition induced a quicker and stronger ERS at low-band alpha rhythm ( ... of alpha rhythms was computed during an S1-S2 paradigm, in which a visual cue (S1) predicted a SHORT (600 ms) or LONG (1400 ms ...
Alpha Rhythms. Markand, Omkar N. Markand, Omkar N. Less Journal of Clinical Neurophysiology. 7(2):163-190, April 1990. ... Pathogenesis and Significance of Abnorma Nonepileptiform Rhythms in the EEG. Schaul, Neil ...
Alpha Arbutin is gentler than many skin-brightening ingredients. Improves uneven complexion: Since arbutin inhibits tyrosinase ... Alpha Arbutin is gentler than many skin-brightening ingredients. Improves uneven complexion: Since arbutin inhibits tyrosinase ... Alpha Arbutin is gentler than many skin-brightening ingredients. Improves uneven complexion: Since arbutin inhibits tyrosinase ... Home › 2% ALPHA ARBUTIN + HYALURONIC ACID - SKIN CLARIFYING SERUM FREE SHIPPING ON ORDERS OVER ₹999 ...
Portable wireless neurofeedback system of EEG alpha rhythm enhances memory Effect of neurofeedback training (NFT) on ... The trainability of brain rhythm using a neurofeedback system is uncertainty be... ...
Two studies investigated frontal alpha lateral asymmetry and frontal interhemispheric coherence during eyes-closed rest, ... Two studies investigated frontal alpha lateral asymmetry and frontal interhemispheric coherence during eyes-closed rest, ... Alpha Rhythm* * Anxiety * Cross-Sectional Studies * Female * Frontal Lobe / physiology* * Functional Laterality ...
Alpha Rhythm / physiology* * Attention / physiology* * Beta Rhythm / physiology * Brain Mapping * Electroencephalography * ... Alpha desynchronization was found over frontal, central and parietal electrodes during sustained attention. This alpha effect ... The alpha desynchronization effect was also localized to the pre- and post-central gyri. The present study demonstrates a ... The alpha desynchronization effect was localized to the brain regions composing the default mode network including the ...
delta rhythms; theta rhythms; alpha rhythms; beta rhythms; gamma rhythms. 29.1 Goal of This Chapter. The goal of ... ...
Generally in alpha frequency band (8-12 Hz) Location - Centroparietal area Morphology - Archlike shape or like an m&qu... more ... Characteristics of the mu rhythms are as follows: Frequency of 7-11 Hz - ... Fleeting alpha. At times, as shown here, the alpha rhythm can be identified only in very brief bursts and often immediately ... This is an example of "slow alpha variant." The patients alpha rhythm at 12 Hz is seen in the second half of the sample. The ...
For example, variations of alpha rhythm frequency (8-12 Hz) across individuals, or alpha amplitude across trials, have been ... 2004) Alpha rhythm of the EEG modulates visual detection performance in humans. Brain Res Cogn Brain Res 20:376-383. ... 1954) The variability of audiory and visual reaction time with change in amplitude and phase of alpha rhythm. Am Psychol 9:444. ... 1952) Visual reaction time and the alpha-rhythm, an investigation of a scanning hypothesis. J Physiol 118:500-508. ...
What is atrioventricular junctional rhythm? Meaning of atrioventricular junctional rhythm medical term. What does ... Looking for online definition of atrioventricular junctional rhythm in the Medical Dictionary? atrioventricular junctional ... Berger rhythm alpha rhythm.. beta rhythm a rhythm in the electroencephalogram consisting of waves smaller than those of the ... nyctohemeral rhythm a day and night rhythm.. pendulum rhythm alternation in the rhythm of the heart sounds in which the ...
2009) Temporal framing of thalamic relay-mode firing by phasic inhibition during the alpha rhythm. Neuron 63:683-696. ... 1977) The cortical source of the alpha rhythm. Neurosci Lett 6:237-241. ... 2007) EEG alpha oscillations: The inhibition-timing hypothesis. Brain Res Brain Res Rev 53(1):63-88. ... 2011) Alpha oscillations correlate with the successful inhibition of unattended stimuli. J Cogn Neurosci 23:2494-2502. ...
From Varela et al., Perceptual framing and cortical alpha rhythm.. • Figure 4.5 Results of experiments revealing temporal ...
... but no modulations of the alpha rhythm. Some studies using auditory stimulation even found an increase of alpha activity with ... b sum over alpha (8-12 Hz) and theta band (4-7 Hz). CSP common spatial pattern algorithm: CSPa alpha and theta band CSPb alpha ... b sum over alpha (8-12 Hz) and theta band (4-7 Hz). CSP common spatial pattern algorithm: CSPa alpha and theta band CSPb alpha ... Markand, O.N.: Alpha rhythms. J. Clin. Neurophysiol. 7(2), 163-190 (1990)CrossRefGoogle Scholar ...
  • The evidence presented in this article corroborates findings from other modalities, indicating that alpha-like activity functionally has an universal inhibitory role across sensory modalities. (frontiersin.org)
  • The thalamus distributes the alpha posteriorly via specific sensory relays, which have a simple return circuit. (futurehealth.org)
  • The mu rhythm has been documented on subdural recording of both sensory and motor cortex and shows the same characteristics as that seen on surface EEG, including distribution, morphology, and reactivity. (medscape.com)
  • However, allocation of these rhythms following an attentional cue, in anticipation of tactile sensory processing, has not been investigated. (pubmedcentralcanada.ca)
  • A central pattern generator (CPG) is defined as a neural network that does not require sensory input to generate a rhythm. (wikipedia.org)
  • any form of sensory stimulation or mental concentration such as solving arithmetic problems could produce this break-up of the alpha rhythm. (rasoulallah.net)
  • Without the cortex, there is a total disruption of the normal spatio-temporal distribution of the alpha wave's spike trains within the thalamus, and cortical damage often disturbs coherence due to this mechanism. (futurehealth.org)
  • Crudely stated: The frequencies of alpha are set in the thalamus, and the spatial and temporal distribution of alpha are controlled by the cortex, with rhythmic "initiation" (phase reset) done by the DC system's "modulatory" influence on the AC rhythms of the EEG. (futurehealth.org)
  • In conclusion, temporal attention for a sub-second delay (800 ms) did modulate low-band alpha rhythm over large regions of both cortical hemispheres. (ox.ac.uk)
  • Results showed that the power of occipital, parietal, and temporal alpha 1 sources was maximum inMCI +h, intermediate inMCI −h, and low in AD patients. (uniba.it)
  • When subjects were considered as a unique group, there was a significant linear correlation of hippocampal volume with the magnitude of alpha 1 sources in the parietal, occipital and temporal areas. (uniba.it)
  • These observations indicate the relevance of both inhibition and disinhibition mechanisms for precise spatiotemporal coordination of movement-related neuronal populations, and illustrate how those mechanisms are implemented through the substantially different neurophysiological properties of sensorimotor alpha- and beta-band rhythms. (elifesciences.org)
  • Neuronal local field potentials in the sensorimotor cortex are organized in two prominent spectral clusters, alpha- and beta-band rhythms, known to be relevant for movement selection and to differ across several features. (elifesciences.org)
  • Figure 1A ) to assess the anatomical and functional specificity of alpha- and beta-band rhythms and their effects on the local excitability of sensorimotor neuronal ensembles during performance of a motor imagery task that offers a window into movement selection. (elifesciences.org)
  • It elucidates the neuronal mechanisms that generate EEG spontaneous rhythms and explores the functional meaning of ERP components in cognitive tasks. (schweitzer-online.de)
  • Objective: The study examined diurnal regulation of salivary alpha-amylase (sAA) in association with daily stressors, adult day services (ADS) use, and other caregiving characteristics. (salimetrics.com)
  • Frequency analysis using simultaneously recorded EEG focused on infant theta (2-6 Hz), alpha (6-9 Hz), and beta (9-14 Hz) rhythms. (nih.gov)
  • No difference was found for the beta rhythm between different attention phases. (nih.gov)
  • Pfurtscheller G, Stancak A Jr, Edlinger G. On the existence of different types of central beta rhythms below 30 Hz. (medscape.com)
  • Mu and beta rhythm topographies during motor imagery and actual movements. (medscape.com)
  • The phase of ongoing prestimulus activity in the high alpha/low beta range (11-17 Hz) at frontocentral locations was strongly associated with saccadic response latencies. (jneurosci.org)
  • EEG rhythms of interest were delta (2-4 Hz), theta (4-8 Hz), alpha 1 (8-10.5 Hz), alpha 2 (10.5-13 Hz), beta 1 (13-20 Hz), and beta 2 (20-30 Hz). (uniba.it)
  • Using magnetoencephalography (MEG), we measured changes in the SI mu rhythm containing mu-alpha (7-14 Hz) and mu-beta (15-29 Hz) components. (pubmedcentralcanada.ca)
  • Analysis of a second data set showed that, on a trial-by-trial basis, tactile detection probabilities decreased linearly with pre-stimulus mu-alpha and mu-beta power. (pubmedcentralcanada.ca)
  • We investigated whether spatial attention directed to or away from the hand impacted allocation of mu-alpha and mu-beta, the predictive value of these rhythms for detection, and the impact of cued attention on evoked responses. (pubmedcentralcanada.ca)
  • Parietal low beta rhythm provides a dynamical substrate for a working memory buffer. (nih.gov)
  • Yet, alpha- and beta-band rhythms differed in their anatomical and functional properties, were weakly correlated, and traveled along opposite directions across the sensorimotor cortex. (elifesciences.org)
  • The most common cause of focal enhancement of beta activities is the breach rhythm . (medscape.com)
  • While the enhancement of beta activities is maximal near the margins of the skull defect, breach rhythms are usually widespread and are often maximal over the central regions, where the mu rhythm can be greatly accentuated. (medscape.com)
  • Rolandic alpha and beta EEG rhythms' strengths are inversely related to fMRI-BOLD signal in primary somatosensory and motor cortex. (mpg.de)
  • Alpha is derived from a in the formula R i = a + bR m , which measures the return on a security ( R i ) for a given return on the market ( R m ) where b is beta. (thefreedictionary.com)
  • He initially identified these two different EEG wave forms as that of alpha activity and that of beta activity, with alpha being associated with cortical inactivity and beta with cortical activity. (springer.com)
  • The current study tested the hypothesis that prior motor experience modulated the sensorimotor mu and beta rhythms. (plos.org)
  • A separate model has shown how posterior alpha rhythms can arise through the actions of a subset of thalamocortical (TC) cells, so-called high-threshold thalamocortical neurons, which project to the occipital cortex ( Vijayan and Kopell, 2012 ). (jneurosci.org)
  • The polarization within the thalamus sets the base frequency of the alpha, but the cortical rhythm requires a complex multi-layer feedback loop from the thalamus to the cortex, and back to the thalamus. (futurehealth.org)
  • In support of the framework, we describe our previous finding that ST-Mindfulness enhanced attentional regulation of alpha in primary somatosensory cortex (SI). (frontiersin.org)
  • Functional significance of the mu rhythm of human cortex: an electrophysiologic study with subdural electrodes. (medscape.com)
  • Increased alpha-band power in the somatosensory cortex ipsilateral to the selected arm was associated with spatially-unspecific inhibition. (elifesciences.org)
  • With this experiment, you will learn about the "broad communication" among hundreds of millions of neurons, and you will observe this through the alpha rhythm of your visual cortex in the presence or absence of light. (backyardbrains.com)
  • When you close your eyes, your visual cortex is not receiving complex information from your eyes (only darkness), and the visual cortex enters an idling mode of synchrony, called "alpha," which is strong enough that we can detect it non-invasively. (backyardbrains.com)
  • What results is that the visual cortex enters a state of synchrony, called "alpha rhythms," which we can observe using our new Heart & Brain SpikerBox . (backyardbrains.com)
  • 3) Finally, in a cognitive neuroscientific part we will show that auditory alpha is modulated by anticipation/expectations with and without auditory stimulation. (frontiersin.org)
  • indicating that the view of alpha as "idling rhythm" irrelevant to cognitive functioning is flawed. (frontiersin.org)
  • The hypothesis was tested of whether neurofeedback training (NFT)-applied in order to increase upper alpha but decrease theta power-is capable of increasing cognitive performance. (springer.com)
  • Training success (extent of NFT-induced increase in upper alpha power) was positively correlated with the improvement in cognitive performance. (springer.com)
  • This is in line with studies showing that increased upper alpha power in a prestimulus (reference) interval is related to good cognitive performance. (springer.com)
  • Enhancing cognitive performance with repetitive transcranial magnetic stimulation at human individual alpha frequency. (springer.com)
  • Pineda JA, Allison BZ, Vankov A. The effects of self-movement, observation, and imagination on mu rhythms and readiness potentials (RP's): toward a brain-computer interface (BCI). (medscape.com)
  • Heart Action Potentials - You should have a basic understanding of the arduino platform and how to use the Heart & Brain SpikerBox to record your heartbeat before moving on to this more challenging experiment of recording your own EEG brain rhythms. (backyardbrains.com)
  • The brain's magnetic field, measuring at 10 femtotesla (fT) for cortical activity and 103 fT for the human alpha rhythm, is considerably smaller than the ambient magnetic noise in an urban environment, which is on the order of 108 fT or 0.1 µT. (wikipedia.org)
  • The brain's alpha rhythms and the mind. (springer.com)
  • This spatial shift in alpha activity is called anteriorization. (jneurosci.org)
  • Anteriorization can thus be understood as a differential effect of anesthetic drugs on thalamic nuclei with disparate spatial projections, i.e.: (1) they disrupt the normal, depolarized alpha in posterior-projecting thalamic nuclei while (2) they engage a new, hyperpolarized alpha in frontothalamic nuclei. (jneurosci.org)
  • We concentrated on the analysis of alpha rhythm (8-13?Hz) changes of the EEG, which is associated with the intelligence. (hindawi.com)
  • We take the human alpha rhythm, which exhibits both multistability and scale invariant fluctuations , as a paradigmatic example and show how a recently proposed biophysical mechanism is a specific example of the present, more general dynamical framework. (plos.org)
  • The increase in GABA inhibition imposes an alpha timescale on both the cortical and thalamic portions of the frontal component that are reinforced by reciprocal thalamocortical feedback. (jneurosci.org)
  • We present a mechanism for anteriorization based on established computational models for frontal and occipital rhythms. (jneurosci.org)
  • The frontal return circuitry is not simple, but the descending routes are complex and somewhat circuitous, taking more time, and thus it is common for the frontal lobe's alpha to be at the slower end of the individual's alpha frequency range. (futurehealth.org)
  • Two studies investigated frontal alpha lateral asymmetry and frontal interhemispheric coherence during eyes-closed rest, Transcendental Meditation (TM) practice, and computerized reaction-time tasks. (nih.gov)
  • accelerated idioventricular rhythm a rhythm of ectopic ventricular origin, faster than the normal rate of the His-Purkinje system but slower than 100 beats per minute, without retrograde conduction to the atria. (thefreedictionary.com)
  • Alpha rhythm changes during the Pilates training over the different regions and the whole brain were mainly analyzed, including power spectral density and global synchronization index (GSI). (hindawi.com)
  • Spectral and source structural development of mu and alpha rhythms from infancy through adulthood. (medscape.com)
  • Both are an important property of human perception, movement, decision making and computation and they occur together in the human alpha rhythm, imparting it with complex dynamical behavior. (plos.org)
  • It is possible for a sub-harmonic variant of the normal alpha rhythm to be present at exactly half the frequency of the normal PDR, which usually has a notched appearance and attenuates with eye opening. (medscape.com)
  • We studied how well the model captured the inter-node correlation structure of the alpha-band power envelopes for different delays between brain areas, and found that the model performs best for propagation delays inside the physiological range (5-10 m/s). (ox.ac.uk)
  • In support of this notion, it has recently been demonstrated that perception is modulated by the prestimulus phase of the α-rhythm ( 31 , 32 ). (pnas.org)
  • We obtained the power spectrum of MEG responses and carried out a phase analysis of the peak frequency of the alpha band. (nii.ac.jp)
  • however, the frequency of the alpha rhythm is decreased by a low blood glucose level. (rasoulallah.net)