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alpha rhythm

noun
1.
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
1935-1940
1935-40; earlier alpha waves, translation of German Alphawellen, term used by their discoverer, German physician Hans Berger (1873-1941)
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for alpha-waves

alpha rhythm

noun
1.
(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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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alpha-waves in Medicine

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
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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10
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