alpha rhythm

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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]
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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