theta-rhythm

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

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WordNet
theta rhythm

noun
the normal brainwave in the encephalogram of a person who is awake but relaxed and drowsy; occurs with low frequency and low amplitude 
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