alpha rhythm

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Related to alpha activity: alpha 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 ?
Some have reported an increase in alpha activity, whereas others observed increase in theta activity and no change in alpha.
The absolute fast alpha activity change in the right parietal region was similar in both gender and women during the binasal inhalation of AEO.
20) investigated TNA alpha activity, TNF receptor (TNFR) levels and the virological, biological, clinical characteristics of HCV in 60 patients with chronic hepatitis C, 34 patients infected with Hepatitis B virus and a 60-member healthy control group.
In the study by Ray and Cole (16) in 1985, it was reported that in cognitive functions such as mental arithmetic not requiring environmental attention, alpha activity increased, particularly in the parietal region, whereas in the tests with emotional content, beta activity increased, particularly in the temporal region.
Oscillatory alpha activity will play a key role in top-down influences of prior congruency expectations.
Increases in SWS, which traditionally would be interpreted as a good thing, can be associated with more subtle changes indicating disrupted sleep, such as the increases we observed in alpha activity, which are revealed when more detailed micro-structural components of the sleep electroencephalogram are assessed.
The samples diverged from the norms for total alpha activity and natural uranium specified in Ordinance #9, according to Maria Stancheva from the regional health inspectorate.
An exciting question now is to what extent the alpha activity can be deliberately influenced with biofeedback.
Alpha activity was defined in a frequency range of 7.
The display showed green bars with increase and red with decrease in amounts of alpha activity, respectively.