noun
the normal brainwave in the encephalogram of a person who is awake but relaxed and drowsy; occurs with low frequency and low amplitude
• Syn: ↑theta rhythm
• Hypernyms: ↑brainwave, ↑brain wave, ↑cortical potential
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nounsee theta rhythm
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Physiol.
any of the brain waves constituting theta rhythm.
[1965-70]
Useful english dictionary. 2012.