rhythm

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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).
Brainstem-diencephalo-septohippocampal systems controlling the theta rhythm of the hippocampus.
The new Science study doubles down on the lack of theta in bats by reporting that theta rhythms also are not present at the cellular level.