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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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Theta rhythm is always a great word to know.
So is sensation. Does it mean:
a region where nerve impulses are transmitted and received in the brain
ability to perceive stimuli
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 
WordNet® 3.0, © 2006 by Princeton University.
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