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Reentrant Information Flow in Electrophysiological Rat Default Mode Network.

Wei Jing1, Daqing Guo1, Yunxiang Zhang1

  • 1Key Laboratory for NeuroInformation of Ministry of Education, Center for Information in Medicine, School of Life Science and Technology, University of Electronic Science and Technology of China Chengdu, China.

Frontiers in Neuroscience
|March 15, 2017
PubMed
Summary

Researchers explored the rodent default mode network (DMN) using electrophysiology during different sleep states. They found frequency-specific information flow patterns supporting conscious awareness.

Keywords:
default mode networkdirected phase transfer entropyinformation flowratsleepwakeful rest

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Area of Science:

  • Neuroscience
  • Systems Neuroscience
  • Cognitive Neuroscience

Background:

  • Functional MRI (fMRI) studies suggest rodent brains exhibit default mode network (DMN) activity analogous to humans.
  • Rodent DMN serves as a potential preclinical model for physiological and pathophysiological research.
  • The precise neuronal mechanisms governing rodent DMN activity remain largely unelucidated.

Purpose of the Study:

  • To investigate the neuronal mechanisms of the rat DMN across distinct vigilance states using electrophysiological data.
  • To analyze power spectrum and directed phase transfer entropy (dPTE) within the rat DMN during wakeful rest (WR), slow-wave sleep (SWS), and rapid-eye-movement sleep (REMS).

Main Methods:

  • Electrophysiological recordings were obtained from rat DMN regions.
  • Analysis included power spectrum assessment and directed phase transfer entropy (dPTE) estimation.
  • Data were analyzed across three vigilance states: wakeful rest (WR), slow-wave sleep (SWS), and REMS.

Main Results:

  • Gamma power decreased in most DMN regions during SWS compared to WR.
  • Gamma power increased in prelimbic cortex, cingulate cortex, and hippocampus during REMS versus WR; retrosplenial cortex showed an inverse pattern.
  • Frequency-specific, opposing anterior-to-posterior (delta band) and posterior-to-anterior (theta band) information flow patterns were observed during WR and REMS, suggesting a reentry loop.

Conclusions:

  • Electrophysiological findings support the similarity between rat and human DMN.
  • A frequency-dependent reentry loop mechanism for anterior-posterior information flow within the rat DMN was identified.
  • This loop may facilitate functional integration and support conscious awareness.