| NOUN | phenomenon | theta rhythm, theta wave | the normal brainwave in the encephalogram of a person who is awake but relaxed and drowsy |
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| Meaning | 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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| Synonym | theta wave | |
| Broader | brainwave, brain wave, cortical potential | (neurophysiology) rapid fluctuations of voltage between parts of the cerebral cortex that are detectable with an electroencephalograph |
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