alpha rhythm(redirected from alpha activity)
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Related to alpha activity: alpha rhythm
(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
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.
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|Noun||1.||alpha rhythm - the normal brainwave in the electroencephalogram of a person who is awake but relaxed; occurs with a frequency of 8-12 hertz|