theta rhythm


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theta rhythm

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.

the′ta rhythm`


n.
a pattern of brain waves (the′ta waves`) with a frequency of 4 to 7 hertz, occurring during light sleep.
[1945–50]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.theta rhythm - the normal brainwave in the encephalogram of a person who is awake but relaxed and drowsy; occurs with low frequency and low amplitude
brain wave, brainwave, cortical potential - (neurophysiology) rapid fluctuations of voltage between parts of the cerebral cortex that are detectable with an electroencephalograph
References in periodicals archive ?
Odor 1 and 2 both elicited diffuse slowing, focal slowing, and sharp waves mainly in temporal region and partly in centro-parietal and frontotemporal region, with more right hemispherical involvement, and increased theta rhythm.
We aimed to investigate EEG changes across a 5-week NF training period using a well-established beta1/theta NF protocol to enhance beta1 without causing increases in theta rhythm.
In the awakened stage the brain has only minimal amount of theta activity and no organized theta rhythm.
The brain's theta rhythm circuitry is also involved in memory retrieval, survival behavior, navigation including virtual reality tracking, wellbeing, and the integration of emotion and cognition.