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Updated: Mar 13, 2026

Optogenetic Entrainment of Hippocampal Theta Oscillations in Behaving Mice

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Published on: June 29, 2018

Different Simultaneous Sleep States in the Hippocampus and Neocortex.

Joshua J Emrick¹, Brooks A Gross², Brett T Riley³

¹University of California, San Francisco, CA.

|October 18, 2016

Summary

This summary is machine-generated.

Sleep-waking states differ between the hippocampus and neocortex, challenging assumptions of brain-wide homogeneity. These findings impact sleep architecture and state transition timing analysis.

Keywords:

EEG REM dissociated states hippocampus homeostasis local sleep neocortex sleep slow wave sleep transition-to-REM

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Published on: June 29, 2018

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Area of Science:

Neuroscience
Sleep Science

Background:

Sleep-waking state assignment typically relies on single-site brain activity.
This approach assumes sleep-waking states are uniform across the entire brain.

Purpose of the Study:

To investigate whether sleep-waking states differ between the hippocampus and neocortex.
To determine if simultaneous brain activity in these regions reflects consistent or divergent states.

Main Methods:

Recorded electroencephalograms (EEG) and electromyograms (EMG) from the hippocampus and neocortex of five adult male rats during sleep.
Assigned sleep-waking states in 10-second epochs using standard criteria.
Analyzed and compared states and signals from simultaneous epochs between the two brain regions.

Main Results:

Total amounts of each sleep-waking state were similar when analyzed independently from hippocampal and neocortical signals.
However, states in simultaneous epochs were discordant as often as they were concordant.
State transitions frequently initiated in the hippocampus before the neocortex, indicating asynchronous progression.

Conclusions:

Hippocampal and neocortical sleep-waking states often diverge within the same epoch.
Electrode location influences estimations of sleep architecture and state transition timing.
Models assuming brain state homogeneity are not suitable for analyzing the sleeping or waking brain.