theta rhythm


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theta rhythm

[′thād·ə ‚rith·əm]
(psychology)
A brain rhythm having a frequency of about 4-7 hertz, and somewhat greater voltage than the alpha rhythm; thought to originate in the hippocampus.
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Figures 2-5 show the spectra of the EEG signal and the filter passbands for alpha, beta, delta, and theta rhythms.
It has been shown that temporary inactivation of PPT results in the suppression of theta rhythm (63) indicating that the functional integrity of PPT is critical for the occurrence of hippocampal synchronization at theta frequency and thus PPT is also one of the important sites in the brainstem reticular formation for theta generation (63).
Rats naturally sniff every 200 milliseconds, and it appears that this 5-hertz sniff rate exploits a natural pattern of electrical signals in the brain, called the theta rhythm, which has the same 5-hertz frequency and which is known to be triggered during learning activities.
The combined findings suggest that the theta rhythm signifies a powerful patterning of group activity imposed upon a fixed connectivity of neighboring neurons," the scientists conclude.