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theta rhythm

noun, Physiology
1.
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
1945-1950
1945-50
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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8
7
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