Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- 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 wave.
Wiktionary
- n. A type of electrical activity in the brain, brain waves with a frequency 4-8 hertz.
WordNet 3.0
- n. the normal brainwave in the encephalogram of a person who is awake but relaxed and drowsy; occurs with low frequency and low amplitude
Etymologies
- theta + rhythm (Wiktionary)
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