alpha-rhythm

alpha rhythm

noun
a pattern of slow brain waves (alpha waves) in normal persons at rest with closed eyes, thought by some to be associated with an alert but daydreaming mind.

Origin:
1935–40; earlier alpha waves, translation of German Alphawellen, term used by their discoverer, German physician Hans Berger (1873–1941)

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World English Dictionary
alpha rhythm or alpha wave
 
n
physiol See also brain wave 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
 
alpha wave or alpha wave
 
n

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American Heritage
Medical Dictionary

alpha rhythm n.
A pattern of smooth, regular electrical oscillations, as recorded by an electroencephalograph, that occur in the human brain when a person is awake and relaxed. Also called alpha wave.

The American Heritage® Stedman's Medical Dictionary
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