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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 of theta rhythm
1945-50 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for theta rhythm
  • theta rhythm was evidently essential for hippocampal function, which in turn was essential for memory.

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