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Acquisition of Resting-State Functional Magnetic Resonance Imaging Data in the Rat
12:41

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Published on: August 28, 2021

Sleep-like states modulate functional connectivity in the rat olfactory system.

Donald A Wilson1, Xiaodan Yan

  • 1Emotional Brain Institute, Nathan Kline Institute for Psychiatric Research, 140 Old Orangeburg Rd., Orangeburg, NY 10962, USA. Donald.wilson@nyumc.org

Journal of Neurophysiology
|September 24, 2010
PubMed
Summary

During slow-wave sleep-like states, the piriform cortex shows enhanced brain connectivity. This suggests a critical period for olfactory memory consolidation when sensory input is reduced.

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Area of Science:

  • Neuroscience
  • Sleep Research
  • Olfactory System

Background:

  • The piriform cortex is crucial for olfactory processing and memory.
  • Brain activity patterns change significantly during different sleep states.
  • Understanding functional connectivity during sleep is key to deciphering memory consolidation mechanisms.

Purpose of the Study:

  • To investigate state-dependent functional connectivity of the piriform cortex during spontaneous brain activity.
  • To explore how connectivity patterns differ between fast- and slow-wave sleep-like states.
  • To determine the directionality of information flow between the piriform cortex and other brain regions during these states.

Main Methods:

  • Rats were anesthetized and induced to cycle through fast- and slow-wave sleep-like states.
  • Local field potential recordings were obtained from the olfactory bulb, piriform cortex, hippocampus, amygdala, and visual cortex.
  • Coherence and Granger causality analyses were employed to assess functional connectivity and information flow.

Main Results:

  • Enhanced coherence between the piriform cortex and other forebrain structures was observed during slow-wave sleep-like states.
  • The piriform cortex exhibited reduced sensitivity to olfactory bulb input during these states.
  • Granger causality indicated a unidirectional influence from the hippocampus to the piriform cortex during slow-wave states.

Conclusions:

  • Slow-wave sleep-like states facilitate enhanced functional connectivity within the forebrain, involving the piriform cortex.
  • These states may represent a critical window for olfactory memory transfer and consolidation, independent of immediate sensory input.
  • The findings highlight the role of specific brain states in modulating information processing and memory consolidation within the olfactory system.