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.
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.
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.
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.
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.
Imaging techniques used to colocalize sites of brain functions or physiological activity with brain structures.
Investigative technique commonly used during ELECTROENCEPHALOGRAPHY in which a series of bright light flashes or visual patterns are used to elicit brain activity.
Methods or programs of physical activities which can be used to promote, maintain, or restore the physical and physiological well-being of an individual.
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.
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.
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 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.
The measurement of various aspects of MAGNETIC FIELDS.
Tomography using single-photon emitting RADIONUCLIDES to create images that are captured in times corresponding to various points in the cardiac cycle.
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.
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).
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.
Lists of words, usually in alphabetical order, giving information about form, pronunciation, etymology, grammar, and meaning.
The terms, expressions, designations, or symbols used in a particular science, discipline, or specialized subject area.
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.
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.
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.
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.
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.
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.
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.
A publication issued at stated, more or less regular, intervals.
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.
The electric response evoked in the CEREBRAL CORTEX by stimulation along AFFERENT PATHWAYS from PERIPHERAL NERVES to CEREBRUM.
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)
The branch of psychology which seeks to learn more about the fundamental causes of behavior by studying various psychologic phenomena in controlled experimental situations.
A psychologic theory, developed by John Broadus Watson, concerned with studying and measuring behaviors that are observable.
A treatment that suppresses undesirable behavior by simultaneously exposing the subject to unpleasant consequences.
The use of one's knowledge in a particular profession. It includes, in the case of the field of biomedicine, professional activities related to health care and the actual performance of the duties related to the provision of health care.
The science which utilizes psychologic principles to derive more effective means in dealing with practical problems.
The branch of psychology concerned with psychological methods of recognizing and treating behavior disorders.
The application of modern theories of learning and conditioning in the treatment of behavior disorders.

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)

In the present high-resolution electroencephalographic (EEG) study, event-related desynchronization/synchronization (ERD/ERS) 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) foreperiod, preceding a visual go stimulus (S2) triggering right or left finger movement. Could orienting attention to a selective point in time influence the alpha rhythms as a function of the SHORT vs. LONG foreperiod? Stronger selective attentional modulations were predicted for the SHORT than LONG condition. EEG data from 54 channels were depurated from phase-locked visual evoked potentials and spatially enhanced by surface Laplacian estimation (i.e., final data analysis was conducted on 16 subjects having a sufficient number of artifact-free EEG single trials). Low-band alpha rhythms (about 6-10 Hz) were supposed to be related to anticipatory attentional processes, whereas high-band alpha rhythms (10-12 Hz) would indicate task-specific visuo-motor
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 ...
The aforementioned analyses revealed that (a) lower adaptive disengagement corresponded with increased rejection estimates, (b) lower adaptive disengagement corresponded with increased MFC alpha power to reject (relative to accept) feedback, and (c) increased MFC alpha power to reject (relative to accept) feedback corresponded with greater rejection estimates. Bringing these elements together, we examined whether MFC alpha power mediated the relationship between adaptive disengagement and rejection estimates. To this end, we averaged participants MFC alpha power to reject and accept feedback 0-500 msec poststimulus and computed a difference score (reject − accept). Next, we tested for mediation by deriving 95% bias-corrected confidence intervals (CIs) from 1000 bootstrap estimates (Edwards & Lambert, 2007). As illustrated in Figure 4C, lower adaptive disengagement predicted greater MFC alpha power to reject (relative to accept) feedback, which in turn predicted greater rejection estimates. ...
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 ...
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 ...
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 ...
Here, the state of the jth oscillator, j = 1, 2, …, N, is determined by a complex variable zj(t) at time t. N is the total number of brain regions acquired from group-averaged diffusion tensor imaging (DTI) with 82 nodes (van den Heuvel & Sporns, 2011). The Ajk = 1 if there is a connection between the jth and kth oscillators, and Ajk = 0 if there is not, based on the structural brain network. Each node undergoes supercritical Hopf bifurcation, and the dynamics of the oscillator settle on a limit cycle if λj , 0 and on a stable focus if λj , 0. Here, we fixed all λj as 1. The ωj = 2πfj and is an initial angular natural frequency of each jth oscillator. We used a Gaussian distribution for natural frequency with a mean frequency of 10 Hz and standard deviation of 0.5 Hz to simulate the alpha bandwidth of human EEG activity (H. Kim et al., 2018; M. Kim et al., 2017; Lee et al., 2018; Moon et al., 2017, 2015). We also used the homogeneous coupling term Kjk = K between the jth and kth ...
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.
Even though Lance has multiple roles, his control of the best sex capsule crew is still not comparable to Tom What Is A Major Cause Of Sexual Dysfunction Chapter 14 Whats Sex Power Increase Medicine In Hindi more, even Paramounts helm is on Toms side. When Wang He heard that his parents were penis enlargement formula Sex Power Increase Medicine In Hindi okay, a big rock in his heart was completely put down As long as his parents were okay, that would be fine Amiodarone Erectile Dysfunction Everything else is not important Very fast! Seeing Wang He rushing away. Boss, the target family of three has been out of the hospital Uncle Hei continued to guard at the entrance of the hospital, only to see Wang Hes family of three walking out Homeopathic Substitute For Viagra of the Sex Power Increase Medicine In Hindi hospital. In the entire Hollywood today, no one dares to speak directly to him like that, no one! Even Steven Spielberg, even Sex Power Increase Medicine In Hindi James Sex Power Drugs For ...
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, ...
Study EEG under a variety of conditions to explore relaxation and brain rhythmsthe software can filter and display each rhythm separately: alpha, beta, delta, and theta. Study alpha rhythms in the occipital lobe, reaction times, and hemispheric asymmetry. Use the system to demonstrate changes in the parasympathetic and sympathetic nervous system. Add EOG (occipital signal) to study eye movement, saccades, tracking, angular displacement, or ocular fixations. Use the stimulator to study evoked responseauditory, visual, or somatosensory. Record reaction time and measure nerve conduction velocity. The system samples quickly enough to easily record spontaneous nerve activity from small animals and insects. ...
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.
Archaic Frontiers 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 Archaic Frontierss : cover picture, songs / tracks list, members/musicians and line-up, different releases details, free MP3 download (stream), buy online links: 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 ...
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(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.
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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
Previous studies have revealed that several cortical signatures are associated with superior motor performance in sports, particularly precision sports. This review examined the strength of the evidence from these studies so that a clear conclusion could be drawn and a concrete direction for future efforts revealed. A total of 26 articles assessing the relationship between cortical activity and precision motor performance were extracted from databases. This review concluded that among the electroencephalographic components examined, only sensorimotor rhythm demonstrated a consistent and causal relationship with superior precision motor performance, whereas findings related to the left temporal alpha and frontal theta and alpha rhythms were not consistent and lacked the evidence needed to draw a causal inference for a role in superior precision motor performance. Future studies would benefit from methodological improvements including larger sample sizes, narrower skill-gap comparisons, ...
The purpose of this training program is not a detailed physical justification of the principles of the «Vector V16» device, since different devices are designed differently. Currently, there are several manufacturers of this equipment, spinoffs from the original research group. In particular, in the Russian original version, the headphones were used as magneto-inductors with an oscillation frequency, which is close to the theta rhythm of the brain, while in later versions of the device - as a conductor of electromagnetic waves that are close to the alpha rhythm of the brain. A good effect is obtained from the use of electromagnetic waves as a trigger mechanism for the study of a healthy body. Also, in many other versions of the device, laser emitters are used to affect the brain of the patient. Using the laser leads to an increase of the resonant response. However, there is a risk of adverse effects of such exposure, so the laser emitter is not used in all models of Vector V16 ...
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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The ED 4 liquid remedy is designed to bring both energy and harmony to the nervous system. It has a calming and relaxing but non-sedative effect and can be taken any time of day or night. It helps to restore natural brain rhythms and enhance awareness. It can help to energize and regenerate nerve cells and helps to clear pollutants that are adversely affecting your brain and nervous system. It addresses imbalances of delta and alpha waves to promote a feeling of calmness and aid restful sleep. ED 4 liquid remedy promotes the generation and function of the entire nervous system field, which supports correct nervous system function and neurological integrity.. ...
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 …
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
مقاله ISI انگلیسی شماره 77710 - ترجمه نشده - موضوع : واقعیت مجازی - 7 صفحه - سال انتشار : 2015 - منبع : الزویر ساینس دایرکت
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 ...
22 January 2013. Sleep and Dreams. Professor Glenn Wilson. Historically, it was difficult to study sleep. Not much can be gleaned from observing recumbent persons and questionnaires are no use because people remember little of their experience during sleep. The breakthrough came in the 1950s with EEG recordings of brain electrical activity (brain waves) when it was confirmed that sleep is anything but dormant.. When awake there is usually a regular wave of around 10cps, called alpha rhythm. As the person falls asleep the waves become slower and less regular, indicating a state called orthodox sleep. After about an hour, an active pattern returns even though the individual looks deeply asleep. This was dubbed paradoxical sleep because the brain is very much awake, even though muscle tone is low. Because rapid bursts of eye movements occur under the closed eyelids it is often called REM sleep.. Orthodox sleep is interspersed with around five periods of REM sleep of progressively longer duration ...
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 ...
In this study, we identified a mechanism by which event-related fields can be produced from oscillatory brain activity. We demonstrated that amplitude fluctuations of ongoing oscillations with respect to peaks and troughs are not symmetrically modulated. Because of this asymmetry, slow ERFs are produced from the amplitude modulations of the ∼10 Hz alpha activity in response to visual stimuli. It is important to note that the amplitude fluctuations of the oscillatory activity can remain asymmetric throughout the trial; however, it is primarily the asymmetric modulations in response to a stimulus that are important here. Had the magnitudes of the peaks and troughs been symmetrically decreased, no shift in the ERF would have been generated (Fig. 1C). Our findings support studies by, for example, Stam et al. (1999) and Breakspear and Terry (2002), challenging the conventional view that ongoing EEG/MEG signals are linear with a Gaussian distribution.. Although our analysis is based on MEG data, the ...
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
ABSTRACT. Objective: The present study aimed to investigate and to compare the electrophysiological changes in bipolar patients and healthy subjects during the execution of a saccade task. Materials and Methods: The subjects had to respond to a fixed visual stimulus presented by a LEDs bar. We executed an ANOVA (one-way) and post hoc Scheffé test to examine the difference of absolute alpha power and reaction time among four groups: control, depression, manic and euthymic. We observed the frontal, parietal and occipital regions. The paired t test was realized on each electrode and group to compare the pre and post moment in the task. Results: We observed a statistical difference among the groups for the behavioral variable-saccade reaction time. For the electrophysiological variable-absolute alpha power, we did not find significant difference between the moments (pre and post stimulus presentation) for none of the electrodes of each bipolar group. However, the results pointed out to a difference ...
Study Music Alpha Waves: Relaxing Studying Music, Brain Power, Focus Concentration Music, is ideal background music to help you concentrate, focus and work more effectively. This instrumental music uses alpha waves and binaural beats to boost concentration and brain power, and is the ideal relaxing music for stress relief. This soothing music can help you study for exams and focus at work.. ...
Study Music Alpha Waves: Relaxing Studying Music, Brain Power, Focus Concentration Music, is ideal background music to help you concentrate, focus and work more effectively. This instrumental music uses alpha waves and binaural beats to boost concentration and brain power, and is the ideal relaxing music for stress relief. This soothing music can help you study for exams and focus at work.. ...
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Sound practices like Om/Aum alters the electro-chemical activity in your brain, and it redistributes the energy evenly and equitably across both hemispheres. As you chant Om, your brain waves slow and stretch out, so that alpha waves predominate. You suspend consciousness, but neither dream nor lose consciousness; you enter what legitimate scientists call the alpha state. If you can describe it, you have not experienced it;, because the alpha state defies language.. Its hard to believe that chanting OM daily can have such amazing effects on our body and yet I wonder why more doctors dont recommend this simply technique to help alleviate anxiety and depression, instead of antidepressants or Valium.. Chanting Om helps to create a relaxed state of being. Practicing often will create stronger connections in your brain and eventually that relaxed state of being will carry over into our daily routines.. Other BENEFITS….. ...
At the busy intersection of Mt. Lucas Road and Ewing Street, Les Fehmis unassuming ranch house has a sign out front: Princeton Biofeedback Center. Fehmi is a psychologist with rooms full of equipment; he attaches sensors to his patients heads and monitors their alpha waves. This kind of biofee ...
Before computing the EEG data by CMI, the ERP data were analyzed (Fig. 1). The EEG data were segmented into 6000-msec epochs (Fig. 2). Each epoch selleck inhibitor included three trials. Sweeps exceeding ±70 μV were excluded by automatic artifact screening. MATLAB 7.1 and EEGLAB (Delorme and Makeig 2004) software were used to apply a phase-corrected FIR filter in the δ Inhibitors,research,lifescience,medical (1-4 Hz), θ (4-7 Hz), α (7-13 Hz), β (13-25 Hz), and γ (25-50. Hz) frequency bands. Figure 1 ERP time series over the entire epoch. Figure 2 Two examples (F4, CP3) of the EEG data, which were segmented into 6000-msec epochs. Each epoch included three trials and the triggers onset at 0, 2000, and 4000 msec. CMI analysis This study analyzed task-related brain oscillations using CMI analysis. CMI quantifies the information transmitted from one electrode to another (Jeong et al. 2001). The CMI analysis was defined as (Jeong et al. 2001): This study evaluated the probabilities by ...
Stress and anxiety can cause your brain to malfunction, and that is what yoga can help avert. Here are the 7 effective asanas in yoga for brain power increase. Have a look
comment by sdr · 2018-01-04T05:38:48.595Z · score: 17 (6 votes) · LW · GW. Hello my values a decade ago, its so nice to see you publicly documented! In retrospect & in particular, the level of paranoia imbued here will serve you well against incentive hijacking, and will serve as a foundational stone in goal stability.. There is one particular policy here, where my thinking has changed significantly since then; and Id love to check against Time whether it makes sense, or has my values been shifted:. , Reject invest-y power. Some kinds of power increase your freedom. Some other kinds require an ongoing investment of your time and energy, and explode if you fail to provide it. The second kind binds you, and ultimately forces you to give up your values. The second kind is also easier, and youll be tempted all the time.. Contrast with:. , Optimization never stops. Avoid one-time effort if at all possible. Aim for long-term stability of the process that generates improvements. There is no room ...
Electroencephalogram (EEG) refers to the recording of electrical signals for detecting the abnormalities related to electrical activity of the brain. Elect
electroencephalography (eeg) is an electrophysiological monitoring technique to record electrical activity of the brain. it is generally noninvasive, with...
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Kamiya, J. (1969). Operant control of the EEG alpha rhythm. In C. Tart (Ed.), Altered states of consciousness. NY: Wiley. ... Kamiya (1968) demonstrated that the alpha rhythm in humans could be operantly conditioned. He published an influential article ... Almost half of his subjects reported experiencing a pleasant "alpha state" characterized as an "alert calmness". These reports ... and that they could use feedback to shift the dominant alpha frequency about 1 Hz. ...
In addition to the posterior basic rhythm, there are other normal alpha rhythms such as the mu rhythm (alpha activity in the ... "alpha wave". This was the "posterior basic rhythm" (also called the "posterior dominant rhythm" or the "posterior alpha rhythm ... alpha activity in the temporal or frontal lobes).[82][83] Alpha can be abnormal; for example, an EEG that has diffuse alpha ... Niedermeyer, E. (1997). "Alpha rhythms as physiological and abnormal phenomena". International Journal of Psychophysiology. 26 ...
... alpha rhythm was used in a brain rhythm based BCI for control of a physical object, a robot. Alpha rhythm based BCI was the ... Noise-driven harmonic oscillators realistically simulate alpha rhythm in the waking EEG as well as slow waves and spindles in ... Bozinovski S, Sestakov M, Bozinovska L (November 1988). "Using EEG alpha rhythm to control a mobile robot.". Proceedings of the ... dynamical control of alpha rhythms in relation to focal attention". International Journal of Psychophysiology. 43 (1): 25-40. ...
"Cerebellar contribution to visuo-attentional alpha rhythm: insights from weightlessness". Cite journal requires ,journal= (help ... "Purkinje cell BKchannel ablation induces abnormal rhythm in deep cerebellar nuclei and prevents Ltd". Scientific Reports. 8 (1 ...
Cohen D (1968). "Magnetoencephalography: evidence of magnetic fields produced by alpha rhythm currents". Science. 161 (3843): ...
Rob's band, the Alpha Rhythm Kings, performed for the 2018 Grammy Awards Nominee Celebration, San Francisco Chapter. He holds ... He is the frontman for "Robert Dehlinger's Alpha Rhythm Kings". As a live trumpeter and backup vocalist Rob has worked with ... With "Robert Dehlinger's Alpha Rhythm Kings" Choo Choo Ch'Boogie (Feat. Tammi Savoy), single, Dehlinger Productions (2021) ... nodepression.com/interview/frontmantrumpeter-robert-dehlinger-debuts-alpha-rhythm-kings-swinging-energy Official website Rob ...
The brain's magnetic field, measuring at 10 femtotesla (fT) for cortical activity and 103 fT for the human alpha rhythm, is ... ISBN 978-0-205-23939-9. Cohen D (August 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". ...
Stam, C. J.; Suffczynski, P.; Lopes da Silva, F. H.; Lopes Da Silva, FH (1999). "Dynamics of the human alpha rhythm: evidence ... 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 ...
In addition to the posterior basic rhythm, there are other normal alpha rhythms such as the mu rhythm (alpha activity in the ... "posterior basic rhythm" (also called the "posterior dominant rhythm" or the "posterior alpha rhythm"), seen in the posterior ... alpha activity in the temporal or frontal lobes). Alpha can be abnormal; for example, an EEG that has diffuse alpha occurring ... S. Bozinovski, M. Sestakov, L. Bozinovska: Using EEG alpha rhythm to control a mobile robot, In G. Harris, C. Walker (eds.) ...
He first identified the alpha rhythm, which he called the Berger rhythm, and later identified the beta rhythm and sleep ... The synchronous alpha rhythm ranges from 8 to 13 Hz and is defined by its waveform and not by its frequency. Alpha activity can ... Kamiya J (1969). "Operant control of the EEG alpha rhythm.". In Tart C (ed.). Altered states of consciousness. NY: Wiley. Brown ... This phenomenon is called alpha blocking. The synchronous sensorimotor rhythm (SMR) ranges from 12 to 15 Hz and is located over ...
Ritter, P; Moosmann, M; Villringer, A (April 2009). "Rolandic alpha and beta EEG rhythms' strengths are inversely related to ... "Correlates of alpha rhythm in functional magnetic resonance imaging and near infrared spectroscopy". NeuroImage. 20 (1): 145-58 ... "Biophysical mechanisms of multistability in resting-state cortical rhythms". The Journal of Neuroscience. 31 (17): 6353-61. doi ...
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 ...
He compared the EEG and alpha rhythm MEG recorded by both normal and abnormal subjects. It is shown that the MEG has produced ...
ISBN 978-1-4411-4851-3. Articles Robinson, Daniel N. (1966). "Visual reaction time and the human alpha rhythm: The effects of ...
1] S. Bozinovski, M. Sestakov, L. Bozinovska: Using EEG alpha rhythm to control a mobile robot, In G. Harris, C. Walker (eds.) ... 1988, 1990), control of a physical object, a robot, using a brain rhythm (alpha) (Bozinovski et al. 1988), control of a text ... The first such communication took place in the 1960s using EEG to create Morse code using brain alpha waves. Using EEG to ... Berger was able to identify oscillatory activity, such as Berger's wave or the alpha wave (8-13 Hz), by analyzing EEG traces. ...
... on Alpha and Oranges) For Madmen Only (1994) Penguin Dust (1997) Alpha and Oranges (1999) Cross Rhythms) Gospel Cola (2000)) ... Figgis, Alex (June 1999). "Atomic Opera - Alpha & Oranges". Cross Rhythms (51). "Atomic Opera - a Review of The Phantom ... 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 ...
"Effects of levetiracetam vs topiramate and placebo on visually evoked phase synchronization changes of alpha rhythm in migraine ...
With study of Alpha wave, also called Berger's rhythm in memory of Hans Berger, Singh undertook a training in electronics. In ...
"JYP/ Alpha 2010 audition results". SEOUL RHYTHMS. 15 April 2011. Archived from the original on 2 January 2018. Retrieved 13 ... Low accompanied her friend to participate in the Singapore leg of the JYP and Alpha Asean Region Audition held in 2010 by Alpha ...
"JYP/ Alpha 2010 audition results". SEOUL RHYTHMS. April 15, 2011. Retrieved 17 August 2012. "Korean-Singaporean girl group ... Skarf's Cafe Daum profile Alpha Entertainment Korea's YouTube Channel Alpha Entertainment Korea official website via archive. ... 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 ...
... 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 ...
Kamiya, J (1962). "Conditioned discrimination of the EEG alpha rhythm in humans". Proceedings of the Western Psychological ... Many could then produce alpha and non-alpha states at will. In the second part of the study, a tone was sounded whenever alpha ... Knowlis, D. P., & Kamiya, J. (1970). The control of electroencephalographic alpha rhythms through auditory feedback and the ... Alpha-theta training has also been shown to improve novice singing in children. Alpha-theta neurofeedback, in conjunction with ...
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 ...
... "rhythm" player, is the alpha figure. Houston Person will forever be recognized for his enveloping sound and reliably melodic ...
Four simple periodic rhythms recorded in the EEG are alpha, beta, delta, and theta, which are distinguished by frequency and ...
... both convergent and divergent thinking produced significant desynchronization of the Alpha 1,2 rhythms.[7] Meanwhile, ...
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 ...
CS1 maint: discouraged parameter (link) "JYP/ Alpha 2010 audition results". SEOUL RHYTHMS. April 15, 2011. Retrieved 13 October ... 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 ...
... when University of Chicago professor Joseph Kamiya trained a volunteer to recognize and alter alpha brain wave activity. Just ... revolutionary study on cats at the behest of NASA that proved that cats trained to consciously alter their sensorimotor rhythm ... Toomim was founding Toomim Biofeedback Laboratories and Biocomp Research Institute on the basis of a device known as the Alpha ... to humans in 1971 when Sterman trained an epileptic to control her seizures through a combination of sensorimotor rhythm and ...
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 wave. *Beta wave. *Delta wave. *Gamma wave. *K-complex. *Mu rhythm ...
Azzolina A, Bongiovanni A, Lampiasi N (Dec 2003). "Substance P induces TNF-alpha and IL-6 production through NF kappa B in ... respiratory rhythm,[33] neurotoxicity, pain, and nociception.[34] In 2014, a role for substance P in male fruit fly aggression ... Koon HW, Zhao D, Na X, Moyer MP, Pothoulakis C (Oct 2004). "Metalloproteinases and transforming growth factor-alpha mediate ... "Posttranslational modification of glycine-extended substance P by an alpha-amidating enzyme in cultured sensory neurons of ...
... causing atrioventricular block that often manifests as heart rhythms that alternate within minutes between abnormally slow and ...
Alpha cleavage. *Louis Althusser. *American Embassy School. *Namie Amuro. *Analog signal processing ...
After theta comes alpha, a wave occurring at 8 to 12 cycles per second. Alpha is seen over the back of the head when a person ... Special adaptations exists to research sleep, for example the length of sleep rhythms. Sleep occurs in different phases, the ... Faster than alpha is beta, a wave that occurs at 12 to 30 cycles per second. It is seen when a person is getting ready to move ...
A number of cytokines, such as IL-1, IL-6, IL-10 and TNF-alpha can activate the HPA axis, although IL-1 is the most potent. The ... Rats that have been prenatally stressed have elevated basal levels and abnormal circadian rhythm of corticosterone as adults.[ ... Children who were stressed prenatally may show altered cortisol rhythms. For example, several studies have found an association ... Whereas maternal care improves cardiac response, sleep/wake rhythm, and growth hormone secretion in the neonate, it also ...
The effectiveness of alpha-1 antitrypsin augmentation treatment for people who have alpha-1 antitrypsin deficiency is unclear.[ ... and changes to the heart rhythm (long QT syndrome).[150] Methylxanthines such as theophylline generally cause more harm than ... "Intravenous alpha-1 antitrypsin augmentation therapy for treating patients with alpha-1 antitrypsin deficiency and lung disease ... This risk is particularly high if someone deficient in alpha 1-antitrypsin also smokes.[60] It is responsible for about 1-5% of ...
Alpha wave. *Beta wave. *Delta wave. *Gamma wave. *K-complex. *Mu rhythm ...
... rhythm guitarist Christopher Thorn of Blind Melon, and guitarist Zak Loy of Alpha Rev, Dames Violent and Mothers Anthem. ... Ed Kowalczyk - lead vocals, rhythm guitar (1989-2009, 2016-present)[24]. Current touring members. *Zak Loy - rhythm guitar, ... The band performed with new touring members, including Gracious Few bandmate Sean Hennesy on rhythm guitar and Alexander ... rhythm guitar), Chad Taylor (lead guitar, backing vocals), Patrick Dahlheimer (bass), and Chad Gracey (drums). ...
Volicer L, Harper D, Manning B, Goldstein R, Satlin A (2001). "Sundowning and circadian rhythms in Alzheimer's disease". Am J ... "Monitoring the prevention of amyloid fibril formation by alpha-crystallin. Temperature dependence and the nature of the ...
Peptidylglycine alpha-amidating monooxygenase amidates peptide hormones by removing the glyoxylate residue from their c- ... This process follows a diurnal rhythm, so that enzyme expression peaks in the morning to support biosynthesis later on when mid ... Eipper BA, Stoffers DA, Mains RE (1992). "The biosynthesis of neuropeptides: peptide alpha-amidation". Annual Review of ... It has been observed that while serum or blood plasma concentrations follow a circadian rhythm or reflect short-term dietary ...
circadian rhythm. • animal organ regeneration. • positive regulation of cell proliferation. • positive regulation of cell size ...
Jet lag was previously included as a situational circadian rhythm sleep disorder, but it doesn't appear in DSM-5 (see ... Sleep disorders are broadly classified into dyssomnias, parasomnias, circadian rhythm sleep disorders involving the timing of ... Special equipment may be required for treatment of several disorders such as obstructive apnea, the circadian rhythm disorders ... Shift work sleep disorder (SWSD), a situational circadian rhythm sleep disorder. ( ...
Circular dichroism shows that normal PrPC has 43% alpha helical and 3% beta sheet content, whereas PrPSc is only 30% alpha ... Circadian rhythm is altered in null mice.[11] Fatal familial insomnia is thought to be the result of a point mutation in PRNP ... a widespread and synchronous rhythm". Neuroscience. 91 (4): 1201-4. doi:10.1016/S0306-4522(99)00092-5. PMID 10391428.. ... with current models proposing a lack of alpha helices all together, replaced instead with a total beta sheet composition.[22] ...
感觉运动节律(英语:Sensorimotor rhythm). *μ节律(英语:Mu wave) ... α波(英语:Alpha wave). *β波(英语:Beta wave). *γ波(英语:Gamma wave) ...
The resulting heart rhythm depends on where the first signal begins: if it is the sinoatrial node, the rhythm remains normal ... Alpha-linolenic acid, cardiovascular disease and sudden death. pubmed. 2007-01-18 कथं। ... it can produce a sustained abnormal rhythm. Rhythms produced by an ectopic focus in the atria, or by the atrioventricular node ... The simplest specific diagnostic test for assessment of heart rhythm is the electrocardiogram (abbreviated ECG or EKG). A ...
Alpha wave. *Beta wave. *Delta wave. *Gamma wave. *K-complex. *Mu rhythm ...
New York: Alpha Books; 1997.. *Collins, Dan. CBS News/Associated Press. "How Big Was The King?"; August 7, 2002 [citado em ... uma fusão de música country e rhythm and blues. Em 1955, o baterista D. J. Fontana juntou-se ao time e completou o quarteto ... fundindo os estilos do país branco e o rhythm and blues dos negros, mudaram permanentemente a face da cultura popular americana ...
ACTH is also related to the circadian rhythm in many organisms.[2] ... melanotropin alpha. melanocyte-stimulating hormone. α-MSH. 138-150 corticotropin-like intermediate peptide. CLIP. 156-176 ...
Alpha wave. *Electrical impedance. *Extra-sensory perception. *Human Potential Movement. *Hypnosis. *Large Group Awareness ...
A fall in blood glucose, causes insulin secretion to be stopped, and glucagon to be secreted from the alpha cells into the ... has a circadian rhythm), with the lowest temperatures occurring at night, and the highest in the afternoons. Other normal ... and simultaneously inhibiting their neighboring alpha cells from secreting glucagon into the blood.[34] This combination (high ...
... and disturbances in heart rhythm or conduction, and death from cardiotoxicity (damage to the heart). Quinine may also trigger a ...
LaBerge S.; Dement W.C. (1982b). "Lateralization of alpha activity for dreamed singing and counting during REM sleep". ... Irregular sleep-wake rhythm. *Jet lag. *Non-24-hour sleep-wake disorder ...
Preclinical research also targets alpha-synuclein.[129] A vaccine that primes the human immune system to destroy alpha- ... Circadian rhythm sleep disorder *Advanced sleep phase disorder. *Delayed sleep phase disorder ... SNCA gene mutations are important in PD because the protein which this gene encodes, alpha-synuclein, is the main component of ... Scientists sometimes refer to Parkinson's disease as a synucleinopathy (due to an abnormal accumulation of alpha-synuclein ...
... such as an alpha:beta ratio of 1:1, low alpha-acid levels (2-5%) with a low cohumulone content, low myrcene in the hop oil, ... on the activity/rest rhythm". Acta Physiol Hung. 99 (2): 133-9. doi:10.1556/APhysiol.99.2012.2.6. PMID 22849837.. ... Alpha acid 3.5-5.5% / beta acid 3-4%). *Žatec (Saaz) - Noble hop, named after Žatec town, used extensively in Bohemia to ... Alpha acid 3-4.5% /Beta acid 3-4.5%). *Spalt - Traditional German noble hop from the Spalter region south of Nuremberg. With a ...
Chord-playing instrumentalists in the rhythm section of a jazz quartet, rock or pop band or big band, such as a piano player, ... This rhythm section tacet creates a change of texture and gives the soloist great rhythmic freedom to speed up, slow down, or ... It is used to help make uneven harmonic rhythms more readable. For example, if written above a measure of standard time, "C / F ... Some fake books extend this slash rhythm notation further by indicating chords that are held as a whole note with a diamond, ...
Edmond M. Dewan (1967). "Occipital alpha rhythm eye position and lens accommodation". 214. Nature. doi:10.1038/214975a0.. ... "Mu and alpha EEG rhythms during the arrest reaction in microgravity". Microgravity Science and Technology.. CS1-vedligeholdelse ... "Organization of thalamic and cortical alpha rhythms: spectra and coherences". Electroencephalography and Clinical ... Frederick Lemere (1936). "The significance of individual differences in the Berger rhythm". Brain. 59 (3): 366-375. doi:10.1093 ...
Epinephrine does this by its effects on alpha and beta receptors.[7] It is found in many animals and some one cell organisms.[8 ... it may result in an abnormal heart rhythm.[1] While the safety of its use during pregnancy and breastfeeding is unclear, the ... Racemic adrenaline works by stimulation of the alpha adrenergic receptors in the airway, with resultant mucosal ...
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 ...
The behavior and origins of the alpha rhythm. The electroencephalographic alpha rhythm (for review, seeNiedermeyer, 1993) is ... parieto-occipital alpha rhythm during a difficult visual discrimination task. The MEG alpha rhythm originates mainly near the ... both with abundant alpha rhythm, to further clarify the role of the object categorization task for the poststimulus alpha ... The sources of alpha rhythm superimposed on the MR image of Observer 1. The white dots andbars indicate the locations and ...
... and frontal alpha rhythm asymmetry during Beethovens 5th symphony. Download Prime PubMed App to iPhone, iPad, or Android ... Acoustic StimulationAdolescentAdultAlpha RhythmArousalAuditory PerceptionBrain MappingElectroencephalographyEmotionsFemale ... Emotions, arousal, and frontal alpha rhythm asymmetry during Beethovens 5th symphony.. Brain Topogr. 2012 Oct; 25(4):423-30.BT ... Emotions, Arousal, and Frontal Alpha Rhythm Asymmetry During Beethovens 5th Symphony. Brain Topogr. 2012;25(4):423-30. PubMed ...
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 ...
... alpha) rhythm. However, how the alpha rhythm relates to the activity of neurons that convey primary visual information is ... alpha) rhythm. However, how the alpha rhythm relates to the activity of neurons that convey primary visual information is ... Temporal framing of thalamic relay-mode firing by phasic inhibition during the alpha rhythm Neuron. 2009 Sep 10;63(5):683-96. ... These results provide a potential cellular substrate for linking the alpha rhythm to perception and further underscore the ...
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+ ...
... the phase of the lower frequency gastric pacemaker modulated the amplitude of alpha waves in the anterior insula. Although ... Richter et al., 2017) found significant electrophysiological communication between gastric pacemaker activity and the alpha ... rhythm within certain regions of the cerebral cortex including the right anterior insula. In other words, they found a role for ... The amplitude of spontaneous alpha rhythm fluctuations varies with the phase of the infra-slow gastric basal rhythm ...
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 ...
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 ...
I started at 11 Hz alpha rhythm, then gradually lapsed into definite focal seizure w/incomplete spread to - Answered by a ... On my EEG, I started at 11 Hz alpha rhythm, then gradually lapsed into definite focal seizure w/incomplete spread to rest of ... The findings read: the drowsy background showed moderately organized posterior dominant activity (alpha rhythm 7hz)… read more ... EEG Report - background activity consists of 8-9Hz, posterity dominant & symmetrical alpha rhythm, responding well to eye ...
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 ...
delta rhythms; theta rhythms; alpha rhythms; beta rhythms; gamma rhythms. 29.1 Goal of This Chapter. The goal of ... ...
The alpha-rhythm of the thalamus. Kybernetik 15:27-37.. OpenUrlCrossRefPubMed ... 2012) A critical role for NMDA receptors in parvalbumin interneurons for gamma rhythm induction and behavior. Mol Psychiatry 17 ... interneurons is required for gamma rhythm induction (32). Furthermore, persistent NMDAR hypofunction confers an increase in ...
Enjoy alpha rhythm, theta, and deep delta. Find a new sense of peace and connection. You can master yourself and create your ... Enjoy alpha rhythm, theta, and deep delta. Find a new sense of peace and connection. You can master yourself and create your ...
In addition to the posterior basic rhythm, there are other normal alpha rhythms such as the mu rhythm (alpha activity in the ... "alpha wave". This was the "posterior basic rhythm" (also called the "posterior dominant rhythm" or the "posterior alpha rhythm ... alpha activity in the temporal or frontal lobes).[82][83] Alpha can be abnormal; for example, an EEG that has diffuse alpha ... Niedermeyer, E. (1997). "Alpha rhythms as physiological and abnormal phenomena". International Journal of Psychophysiology. 26 ...
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 ...
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 ...
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 ... 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 ... Hippocampal volume and cortical sources of EEG alpha rhythms in mild cognitive impairment and Alzheimer disease. ... Hippocampal volume and cortical sources of EEG alpha rhythms in mild cognitive impairment and Alzheimer disease ...
Alpha Rhythm. Athletes*. Brain / physiology*. Cortical Synchronization. Electroencephalography. Female. Humans. Judgment / ... With reference to a pre-stimulus period, the power decrease of alpha (8-12 Hz) rhythms during the video indexed the cortical ... In conclusion, athletes judgment of observed sporting actions is related to less pronounced alpha ERD, as a possible index of ... Regarding the hypothesis of intermediate cortical activity in amateur karate athletes, low- and high-frequency alpha ERD was ...
  • Due to the relatively small spatial extent of auditory cortical areas, this rhythmic activity is less obvious and frequently masked by non-auditory alpha-generators when recording non-invasively using magnetoencephalography (MEG) or electroencephalography (EEG). (frontiersin.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)
  • 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)
  • 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)
  • The prominent posterior α-rhythm (8-14 Hz) was first described by Hans Berger ( 1 ) and long considered to reflect cortical idling ( 2 , 3 ). (pnas.org)
  • With reference to a pre-stimulus period, the power decrease of alpha (8-12 Hz) rhythms during the video indexed the cortical activation (event-related desynchronization, ERD). (biomedsearch.com)
  • Cortical and subcortical correlates of electroencephalographic alpha rhythm modulation. (uniklinik-freiburg.de)
  • we examined the spatiotemporal distribution of the two sensorimotor rhythms and their cortical effects through two complementary analyses. (elifesciences.org)
  • 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)
  • In the present high-resolution electroencephalographic (EEG) study, event-related desynchronization/synchronization (ERD/ERS) 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) foreperiod, preceding a visual go stimulus (S2) triggering right or left finger movement. (ox.ac.uk)
  • The event-related desynchronization/synchronization(ERD/ERS) time courses of lower and upper alpha band rhythms during hand motor imagery are investigated respectively by Fourier Sectral Entropy (FSE) in this paper . (bvsalud.org)
  • These rhythms show an event related desynchronization (ERD) with stimulation or movement, and in pre-movement periods, with a subsequent synchronization (ERS). (pubmedcentralcanada.ca)
  • Event-related desynchronization/synchronization were calculated in the upper alpha and the beta frequency ranges. (hindawi.com)
  • Specifically, we hypothesized that these sensorimotor rhythms would be more desynchronized after active motor experience compared to passive observation experience. (plos.org)
  • The synchronized alpha oscillations may reflect attenuation of occipito-parietal information transfer and disengagement of parietal cortex from object selection. (jneurosci.org)
  • We will also introduce ideas and initial evidence that alpha oscillations are involved in the most complex capability of the auditory system, namely speech perception. (frontiersin.org)
  • In recent years, an accumulating amount of evidence suggests that on a sensory and motor level, the excitatory-inhibitory (E-I) balance is reflected by alpha-like oscillations (∼8-12 Hz) which can be recorded non-invasively using techniques such as magnetoencephalography (MEG) or electroencephalography (EEG). (frontiersin.org)
  • These results provide a potential cellular substrate for linking the alpha rhythm to perception and further underscore the central role of inhibition in controlling spike timing during cognitively relevant brain oscillations. (nih.gov)
  • In particular, we investigated if and how alpha & theta oscillations are modulated by cognitive workload. (springer.com)
  • In general, the functional role of alpha band oscillations is not yet conclusive. (springer.com)
  • For a memory task in the auditory domain, [ 6 ] reports a modulation of theta oscillations only, but no modulations of the alpha rhythm. (springer.com)
  • EEG alpha and theta oscillations reflect cognitive and memory performance: A review and analysis. (springer.com)
  • Brain oscillations and human memory performance: EEG correlates in the upper alpha and theta bands. (springer.com)
  • In the current study, we present a spiking neuron network model that is able to produce noisy, distributed alpha-oscillations, matching the power peak in the spectrum of group resting-state MEG recordings. (ox.ac.uk)
  • We observed an impact in each of these dimensions, indicating that the decreased expression of localized alpha oscillations could be causally beneficial to attentional regulation employed across neocortical areas. (pubmedcentralcanada.ca)
  • A well-known example of macroscopic neural oscillations is alpha activity. (wikipedia.org)
  • We also suggest that the nesting of slow (for example, alpha-band and theta-band) oscillations and fast (gamma-band) oscillations can serve as an important control mechanism that allows or prevents spiking signals to be routed between specific networks. (nature.com)
  • Alpha adrenoceptor agonist-induced microcirculatory oscillations are reduced in diabetic neuropathy. (mpg.de)
  • The communication between ICC and the insular cortex occurred through phase amplitude coupling, the phase of the lower frequency gastric pacemaker modulated the amplitude of alpha waves in the anterior insula. (frontiersin.org)
  • alpha rhythm uniform rhythm of waves in the normal electroencephalogram, showing an average frequency of 10 per second, typical of a normal person awake in a quiet resting state. (thefreedictionary.com)
  • beta rhythm a rhythm in the electroencephalogram consisting of waves smaller than those of the alpha rhythm, having an average frequency of 25 per second, typical during periods of intense activity of the nervous system. (thefreedictionary.com)
  • Several normal stage I patterns easily can be mistaken for epileptic sharp waves or spikes, including vertex sharp transients, POSTS, and even fragments of alpha rhythm as it drops out. (medscape.com)
  • Indeed, EEG signals change dramatically during sleep and show a transition from faster frequencies to increasingly slower frequencies such as alpha waves. (wikipedia.org)
  • Both rhythms displayed effector-specific modulations, tracked spectral markers of action potentials in the local neuronal population, and showed spatially systematic phase relationships (traveling waves). (elifesciences.org)
  • You should therefore, not think of the alpha brain waves as being the cause of all the problems and conditions that people suffer from. (selfgrowth.com)
  • One of the most highly recommended ways of increasing the level of alpha brain waves is making use of brainwave entrainment. (selfgrowth.com)
  • About a second before they committed the error, brain waves in two regions spiked: alpha wave activity in the occipital region was about 25 percent greater than usual, and in the sensorimotor cortex there was a corresponding increase in the brain's mu wave activity. (discovermagazine.com)
  • Once an error had occurred wave activity surged in the front of the brain, which appeared to drive down the alpha waves, according to the study published in the journal Human Brain Mapping . (discovermagazine.com)
  • There may exist a link between peak performance and alpha-rhythm brain waves. (aleph.se)
  • This is analogous to the slow waves your brain generates while in deep sleep or the alpha waves the visual cortex generates when your eyes are closed. (backyardbrains.com)
  • These "alpha waves" were first observed by the German scientist Hans Berger in 1924 ( published in 1929 ). (backyardbrains.com)
  • calm wakefulness is accompanied by alpha waves 8-12 hz (cycles per second) and low voltage fast activity of mixed frequency. (rasoulallah.net)
  • alpha waves disappear when we open our eyes. (rasoulallah.net)
  • 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)
  • EEG alpha synchronization is related to top-down processing in convergent and divergent thinking. (nih.gov)
  • Performers exhibited the greatest mu rhythm desynchronization in the 8-13 Hz band, particularly in the right hemisphere compared to observers and novices. (plos.org)
  • The researchers measured electrical rhythms from the brains of volunteers, especially the alpha rhythm. (psychcentral.com)
  • See the electrical rhythms of your own brain! (backyardbrains.com)
  • Many of the physiological processes that recur in humans about every 24 hours (with circadian rhythm ) have been known for centuries. (thefreedictionary.com)
  • Cued spatial attention modulates functionally relevant alpha rhythms in visual cortices in humans. (pubmedcentralcanada.ca)
  • This study uses electrocorticography in humans to assess how alpha- and beta-band rhythms modulate excitability of the sensorimotor cortex during psychophysically-controlled movement imagery. (elifesciences.org)
  • This is just one example of how rhythm could contribute to humans unique cognitive abilities. (wikipedia.org)
  • This hypothesis has now been rejected by most chronobiologists , who hold that the biological rhythms are intrinsic to the organisms, and that the organisms possess their own physiological mechanism for keeping time. (thefreedictionary.com)
  • Biological rhythms are responsive to, or synchronous with, environmental cycles, but it is generally agreed among chronobiologists that the rhythmic changes in environmental factors do not create biological rhythms, even though they are capable of influencing them. (thefreedictionary.com)
  • Even in the absence of such environmental stimuli as light, darkness, temperature, gravity, and electromagnetic field, biological rhythms continue to maintain their cyclic nature for a period of time. (thefreedictionary.com)
  • this article attempts to explain those related to our biological rhythms. (rasoulallah.net)
  • The alpha level was higher after non-objects than missed objects, and higher after missed than correctly detected objects, suggesting that the alpha level is inversely related to saliency or familiarity of the object and does not directly reflect visual awareness. (jneurosci.org)
  • Rolandic alpha and beta EEG rhythms' strengths are inversely related to fMRI-BOLD signal in primary somatosensory and motor cortex. (mpg.de)
  • Here we report on the reactivity of magnetoencephalographic (MEG) parieto-occipital alpha rhythm during a difficult visual discrimination task. (jneurosci.org)
  • To be absolutely certain that this is a mu rhythm, reactivity should be tested. (medscape.com)
  • 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)
  • The contrast between the first and second halves of the page illustrates the reactivity of a normal alpha rhythm, with attenuation upon eye opening. (medscape.com)
  • The Nature study reports four genetic variations are associated with T cell reactivity to alpha synuclein. (neurosciencenews.com)
  • Atrophy of hippocampus and alteration of resting eyes-closed electroencephalographic (EEG) rhythms represent important features of mild cognitive impairment (MCI) and Alzheimer's disease (AD). (uniba.it)
  • Sub-second "temporal attention" modulates alpha rhythms. (ox.ac.uk)
  • It should be symmetric with no significant difference in amplitudes on laterality, a posterior dominant rhythm (PDR) should be identifiable with a clear anterior to posterior gradient in admixtured frequencies, with faster frequencies anteriorly in the beta (13-17 Hz) range. (medscape.com)
  • [ 3 ] Adults should have a posterior dominant rhythm between 8 and11 Hz. (medscape.com)
  • Slowing of the background posterior dominant rhythm is a nonspecific finding, which suggests mild diffuse encephalopathy (cerebral dysfunction). (medscape.com)
  • However knowledge about the functional relevance of the auditory alpha rhythm has remained scarce so far. (frontiersin.org)
  • Results from the visual and sensorimotor system have fuelled the hypothesis of alpha activity reflecting a state of functional inhibition. (frontiersin.org)
  • Functional significance of the mu rhythm of human cortex: an electrophysiologic study with subdural electrodes. (medscape.com)
  • Pfurtscheller G, Neuper C, Krausz G. Functional dissociation of lower and upper frequency mu rhythms in relation to voluntary limb movement. (medscape.com)
  • To a large extent, the α-rhythm has been ignored by animal neurophysiologists (but see ref. 4 ) and considered to be of little functional relevance. (pnas.org)
  • The preliminary results show that FSE could disclose the different behaviors of the upper and lower alpha band rhythms so that a new idea with the complexity measure is provided to characterize functional dissociation of lower and upper frequency alpha rhythms in relation to hand motor imagery. (bvsalud.org)
  • 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)
  • 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)
  • Directed functional connectivity analyses based on electrical source imaging revealed frequency specific network atypicalities in the theta and alpha frequency bands, manifesting as alterations in both the driving and the connections from key nodes of the social brain associated with autism. (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)
  • The non-objects were systematically followed by a higher level of alpha than the objects, the difference emerging on average 400 msec after the stimulus, with a median delay of 130 msec after evoked response onsets in the occipital, temporal, and parietal cortices. (jneurosci.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)
  • 4 Hz high voltage frontal slowing & rhythmic blinking in phase w/temporal high voltage 6 Hz rhythm. (justanswer.com)
  • 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)
  • Changes in the human neuromagnetic alpha rhythm were monitored during an object detection task to study the effects of visual shape processing on the parieto-occipital activity. (jneurosci.org)
  • The reactive alpha rhythm was generated in the parieto-occipital sulcus, which in several primate species includes areas belonging to the dorsal visual pathway. (jneurosci.org)
  • The goal of the present study was to determine whether visual shape can modify the parieto-occipital alpha rhythm and whether the alpha level covaries more closely with the stimulus features or with the conscious perception. (jneurosci.org)
  • Several aspects of perception, particularly those pertaining to vision, are closely linked to the occipital alpha (alpha) rhythm. (nih.gov)
  • The first discovered and best-known frequency band is alpha activity (8-12 Hz) that can be detected from the occipital lobe during relaxed wakefulness and which increases when the eyes are closed. (wikipedia.org)
  • Berger rhythm: Potential changes from the occipital loves of man. (springer.com)
  • Benson B and Krasovich M. Circadian rhythm in the number of granulated vesicles in the pinealocytes of mice. (angelfire.com)
  • RESULTS : The circadian rhythm of melatonin and TNF-alpha secretion was significantly disturbed in three of 8 OSAS patients : nocturnal physiologic peaks in these substances had almost disappeared and an additional daytime peak had developed. (nii.ac.jp)
  • 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)
  • Other frequency bands are: delta (1-4 Hz), theta (4-8 Hz), beta (13-30 Hz), low gamma (30-70 Hz), and high gamma (70-150 Hz) frequency bands, where faster rhythms such as gamma activity have been linked to cognitive processing. (wikipedia.org)
  • 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)
  • Spectral and source structural development of mu and alpha rhythms from infancy through adulthood. (medscape.com)
  • 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)
  • These results support the growing consensus that cue-induced alpha modulation is a functionally relevant sensory gating mechanism deployed by attention. (pubmedcentralcanada.ca)
  • 2005) we showed the network of areas involved in spontaneous alpha rhythm modulation, including an area of the Thalamus (centromedian nuclei) that is linked to attention. (uniklinik-freiburg.de)
  • This study is the first to contrast active tool-use experience and observation experience in the mu rhythm and to show modulation with relatively shorter amounts of experience than prior mirror neuron expertise studies. (plos.org)
  • Melatonin plays an important role in regulating circadian rhythms. (readbyqxmd.com)
  • Arendt J. Melatonin, circadian rhythms, and sleep. (angelfire.com)
  • Benitez-King G, Hernandez ME, Tovar R and Ramirez G. Melatonin activates PKC-alpha but not PKC-epsilon in N1E-115 cells. (angelfire.com)
  • Seeking the interaction between abnormalities of somnogenic humoral factors and excessive daytime somnolence of patients with OSAS, we investigated whether circadian rhythms of melatonin and several cytokines secretion were altered in patients with OSAS. (nii.ac.jp)
  • and at 2h intervals on the following night using catheters in a forearm vein, and melatonin plasma levels and cytokines secretion (IL-1-beta, IL-10, TNF-alpha) were determined. (nii.ac.jp)
  • Nasal CPAP therapy almost normalized melatonin and TNF-alpha rhythms. (nii.ac.jp)
  • CONCLUSION : These results suggest that abnormalities of melatonin and TNF-alpha rhythms may play a key role in the expression of the daytime somnolence in patients with severe OSAS. (nii.ac.jp)
  • 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)
  • 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)
  • 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)
  • Mu and beta rhythm topographies during motor imagery and actual movements. (medscape.com)
  • By analyzing one group of BCI competition data, it was found that FSE within upper alpha band displays a pronounced increase and decrease over contralateral and ipsilaterai brain areas respectively at the onset of hand motor imagery, which is corresponding to the antagonistic ERD/ERS patterns in previous studies. (bvsalud.org)
  • Pfurtscheller G, Stancak A Jr, Edlinger G. On the existence of different types of central beta rhythms below 30 Hz. (medscape.com)
  • 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)
  • 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)
  • 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)
  • The current study tested the hypothesis that prior motor experience modulated the sensorimotor mu and beta rhythms. (plos.org)
  • 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)
  • The neuroscience of rhythm refers to the various forms of rhythm generated by the central nervous system (CNS). (wikipedia.org)
  • A Nature Neuroscience study reveals the normal role of alpha-synuclein, a protein implicated in Parkinson's disease. (neurosciencenews.com)
  • Attenuation (drop out) of the alpha rhythm: Drop out of alpha activity typically occurs together with or nearby SREM. (medscape.com)
  • Previous reports of an overall alpha power enhancement during the MP exposure were confirmed (relative to Sham), with this effect larger at ipsilateral than contralateral sites over posterior regions. (avaate.org)
  • however, there was less alpha power contralateral to the exposure source during this period (relative to ipsilateral). (avaate.org)
  • the rhythm may reflect activity in the human dorsal visual stream ( Hari and Salmelin, 1997 ). (jneurosci.org)
  • Covariance maps showed a right-frontal suppression of lower alpha-band activity during high arousal. (unboundmedicine.com)
  • Like the visual and the sensorimotor systems, the auditory system exhibits pronounced alpha-like resting oscillatory activity. (frontiersin.org)
  • However, how the alpha rhythm relates to the activity of neurons that convey primary visual information is unknown. (nih.gov)
  • found significant electrophysiological communication between gastric pacemaker activity and the alpha rhythm within certain regions of the cerebral cortex including the right anterior insula. (frontiersin.org)
  • Regarding the hypothesis of reduced activity in elite karate athletes, low- and high-frequency alpha ERD was less pronounced in dorsal and "mirror" pathways in the elite karate athletes than in the non-athletes. (biomedsearch.com)
  • Different from the upper alpha activity pattern, FSE within lower alpha band displays a consistent increase over both two hemispheres hand representative areas. (bvsalud.org)
  • That should be reflected in a drop in alpha wave activity in the visual area, Mazaheri said. (psychcentral.com)
  • The appearance of continuous 6-activity in the dorsal and ventral hippocampus is highly characteristic: it is more regular, more rapid (5-7 c/s) and, above all, of a more extensive topography than that observed during intense alertness (4-4.5 c/s) in the dorsal hippocampus the presence of a 6-rhythm in the ventral hippocampus occurring only exceptionally in the waking state. (univ-lyon1.fr)
  • when the eyes are opened, the alpha rhythm is replaced by fast irregular low voltage activity with no dominant frequency, called the alpha block . (rasoulallah.net)
  • the body timing system that drives circadian rhythms is exposed to external factors ranging from the imposed activity-rest cycle, the natural light-dark cycle, and social activities outside the workplace. (rasoulallah.net)
  • 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)
  • 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)
  • Slower alpha rhythm associates with poorer seizure control in epilepsy. (nih.gov)
  • The alpha rhythm gradually becomes slower, less prominent, and fragmented. (medscape.com)
  • Low-band alpha rhythms (about 6-10 Hz) were supposed to be related to anticipatory attentional processes, whereas high-band alpha rhythms (10-12 Hz) would indicate task-specific visuo-motor processes. (ox.ac.uk)
  • This rhythm can be used to regulate essential physiological processes. (wikipedia.org)
  • Although the EEG is almost over 100-years old, the processes that are ultimately responsible for the rhythms that can be recorded on the brain surface of skull are only partially understood. (utwente.nl)
  • The most dangerous frequency is at the median alpha-rhythm frequencies of the brain: 7 hz. (fredericksburg.com)
  • We concentrated on the analysis of alpha rhythm (8-13?Hz) changes of the EEG, which is associated with the intelligence. (hindawi.com)
  • And the resting-state EEG rhythms were recorded with eyes closed before Pilates training and after each two weeks training. (hindawi.com)
  • [ 2 ] Nonepileptiform abnormalities are characterized by alterations in normal rhythms or by the appearance of abnormal ones. (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)
  • 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)
  • Here we show that in behaving cats, thalamocortical neurons in the lateral geniculate nucleus (LGN) that operate in a conventional relay-mode form two groups where the cumulative firing is subject to a cyclic suppression that is centered on the negative alpha rhythm peak in one group and on the positive peak in the other. (nih.gov)
  • TY - JOUR T1 - Emotions, arousal, and frontal alpha rhythm asymmetry during Beethoven's 5th symphony. (unboundmedicine.com)
  • 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)
  • Compared to the LONG condition (foreperiod), the SHORT condition induced a quicker and stronger ERS at low-band alpha rhythm (about 6-8 Hz) over midline and bilateral prefrontal, sensorimotor, and posterior parietal areas. (ox.ac.uk)
  • You may have images float by in earlier stages, particularly when you are going through Alpha or Theta, but the actual dream state occurs in REM. (psychcentral.com)
  • Biochemical analyses of urine, blood enzymes, and plasma serum also have demonstrated circadian rhythms. (thefreedictionary.com)