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theta wave

noun, Physiology
any of the brain waves constituting theta rhythm.
1965-70 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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theta-wave in Medicine

theta wave n.
A waveform on an electroencephalogram having a frequency of 4 to 8 hertz, recorded chiefly in the hippocampus of carnivorous mammals when they are alert or aroused. Also called theta rhythm.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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