theta wave

theta wave

noun Physiology.
any of the brain waves constituting theta rhythm.

Origin:
1965–70

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American Heritage
Medical Dictionary

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
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