alpha rhythm


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Related to alpha rhythm: beta rhythm

alpha rhythm

or

alpha wave

n
(Physiology) physiol the normal bursts of electrical activity from the cerebral cortex of a drowsy or inactive person, occurring at a frequency of 8 to 12 hertz and detectable with an electroencephalograph. See also brain wave

al′pha rhythm`


n.
a pattern of slow brain waves (al′pha waves`) in normal persons at rest with closed eyes, thought by some to be associated with an alert but daydreaming mind.
[1935–40]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.alpha rhythm - the normal brainwave in the electroencephalogram of a person who is awake but relaxed; occurs with a frequency of 8-12 hertz
brain wave, brainwave, cortical potential - (neurophysiology) rapid fluctuations of voltage between parts of the cerebral cortex that are detectable with an electroencephalograph
References in periodicals archive ?
It was rhythmic with an 8-9-Hz alpha rhythm, and no abnormalities were found.
This is the target for the detection of alpha waves by EEG, which normally occur in awake humans with closed eyes, and in a case of a distress the activity of the alpha rhythm fades away.
Due to time limitation between sessions, we often asked a preselected person with known high amplitude alpha rhythm (i.
Jennifer then starts to ask questions about her and Marty's future self, but the Doc thought this to be a bad idea and activates a "Sleep-inducing Alpha Rhythm Generator", a hand-held electronic gadget that emitted light which instantaneously put Jennifer to sleep.
How the alpha rhythm manages to affect learning is something we investigate with computer models," said PD Dr.
Based on the above description, the most interesting and hopefully revealing are delta and theta rhythms, which have already been correlated with different brain disorders, and alpha rhythm, because it represents the awake state that is most easily measured without distractions (subject is relaxed without mental activity).
EER registration was carried out during the period awakening between seizures in the condition of passive awakening and in 54% of cases dominant activity was presented by slow alpha rhythm 7-8-9 GC, 21%-teta-rhythm 5-6 GC, 18%-alpha rhythm 10-12GC, in 7% of cases-by alpha-beta rhythm 12-14 GC.
However, the abnormal alpha rhythm could reflect a state of alertness during nocturnal sleep that would determine the subjective feeling of nonrestorative sleep.
In the first module, "cortical functioning," performed assessments on the basis of alpha-wave characteristics, including, nature of alpha rhythm, alpha-rhythm frequency, amplitude, topography, amplitude asymmetry, and changes in alpha waves in response to the provocative tests (see Table 1).
Kennedy argued that the EEG alpha rhythm is not a result of cellular activity but rather is an artifact due to the gross physical properties of materials from which the recordings are made (i.
l l l l l l PAUL CARBERRY , taken to hospital after suffering a fall on Alpha Rhythm at Kilbeggan on Saturday evening, will not resume until Saturday.
The alpha rhythm is mainly generated in the visual cortex occuring in the frequency range of 8-13 Hz.