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theta rhythm

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theta rhythm

–noun Physiology.
a pattern of brain waves having a regular frequency of 4 to 7 cycles per second as recorded by an electroencephalograph, observed during various states of light sleep or arousal.

Origin:
1945–50
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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theta rhythm  
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 wave.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: the·ta rhythm
Pronunciation: 'thAt-&-, Brit usu 'thEt-&-
Function: noun
: a relatively high amplitude brain wave patternbetween approximately 4 and 9 hertz that is characteristic especially of the hippocampus but occurs in many regions of the brain including the cortex called also theta, theta wave
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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