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Network Analysis of the Default Mode Network Using Functional Connectivity MRI in Temporal Lobe Epilepsy
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Basal forebrain contributes to default mode network regulation.

Jayakrishnan Nair1, Arndt-Lukas Klaassen1,2, Jozsef Arato3

  • 1Visual Cognition Laboratory, Department of Medicine, University of Fribourg, 1700 Fribourg, Switzerland.

Proceedings of the National Academy of Sciences of the United States of America
|January 25, 2018
PubMed
Summary
This summary is machine-generated.

The basal forebrain (BF) shows heightened gamma activity during rest and suppressed activity during exploration, mirroring the default mode network (DMN). This suggests the BF acts as a DMN node, potentially regulating brain states.

Keywords:
anterior cingulate cortexgamma suppressiongranger causality

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Area of Science:

  • Neuroscience
  • Brain Networks
  • Gamma Oscillations

Background:

  • The default mode network (DMN) is active during rest and shows suppressed gamma activity during external stimuli.
  • The basal forebrain (BF) is known for its role in arousal, memory, and sensory processing.

Purpose of the Study:

  • To investigate the role of the basal forebrain (BF) in the default mode network (DMN).
  • To determine if BF gamma oscillations mirror DMN activity patterns.

Main Methods:

  • Recording local field potential gamma activity in rat basal forebrain (BF) during rest and exploration.
  • Analyzing the directional influence of BF gamma activity on the anterior cingulate cortex (a hub of the rat DMN).

Main Results:

  • Rat BF exhibits pronounced gamma oscillations during quiet wakefulness and suppression during exploration.
  • BF gamma-band activity influences the anterior cingulate cortex during DMN-dominated states.
  • BF gamma oscillations show a pattern similar to DMN activity.

Conclusions:

  • The basal forebrain (BF) may function as a subcortical node within the default mode network (DMN).
  • BF's role could be crucial for switching between internally and externally directed brain states.
  • BF nuclei may be potential therapeutic targets for DMN-related disorders like epilepsy and depression.