Transition of Septo-Hippocampal Network Modes between Theta and Non-Theta States

Ivan Mysin; Liubov Shubina

doi:10.20944/preprints202205.0181.v1

Preprint Review Version 1 Preserved in Portico This version is not peer-reviewed

Version 1 : Received: 12 May 2022 / Approved: 13 May 2022 / Online: 13 May 2022 (07:52:48 CEST)

Hippocampus plays a crucial role in spatial and episodic memory. The acquisition of new memories is impossible without participation of the hippocampus. There are two main functional states or “modes” of the hippocampal activity, theta and non-theta state. They have different behavioral correlates and clearly different spectral content of the LFPs and neuronal spiking. Hippocampal theta state is present under active exploratory behavior, locomotion, cognitive situations requiring attention and REM sleep. Slow-wave sleep and quiet wakefulness (immobility, eating, grooming) represent the non-theta hippocampal state. The nodal point for the regulation of hippocampal activity is the MS. The activation or suppression of different types of MS cells appears to be responsible for controlling hippocampal theta and non-theta states. Functional coupling between MS neurons and hippocampal interneurons varies in a state-dependent manner.

Teevra cells; Komal cells; medial septum; freely behaving animals; ripples; delta; theta

BEHAVIORAL SCIENCES, Behavioral Neuroscience

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Transition of Septo-Hippocampal Network Modes between Theta and Non-Theta States

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