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Functional heterogeneity in the default mode network edges.

Toshihiko Aso1, Hidenao Fukuyama

  • 1Human Brain Research Center, Kyoto University Graduate School of Medicine , Kyoto, Japan .

Brain Connectivity
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PubMed
Summary
This summary is machine-generated.

The brain's default mode network (DMN) exhibits multiple connectivity modes, explaining its stable yet variable nature. Understanding these co-occurrence networks is key to defining DMN topology and function.

Keywords:
BOLD signaldefault mode networkfunctional connectivityindependent component analysislarge-scale cortical networkstask-positive network

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Network Science

Background:

  • The default mode network (DMN) is extensively studied, yet its topological definition remains unclear.
  • Coactivation analysis suggests synchronous activity, fundamental for network detection, originates from concomitant activation.
  • Understanding co-occurrence networks is vital for elucidating intrinsic remote connectivity in the brain.

Purpose of the Study:

  • To define the topology of the default mode network (DMN).
  • To investigate the role of coactivation in DMN synchronous activity.
  • To explain the DMN's dual characteristics of robustness and variation through multiple connectivity modes.

Main Methods:

  • Monitoring DMN signal variation during transitions between tasks and rest.
  • Analyzing network signal changes across different cognitive states.
  • Employing connectivity analysis to identify distinct signal components and network relationships.

Main Results:

  • A subset of DMN nodes displayed three distinct activity levels with no transition response between blocks.
  • Other DMN components showed signal overshooting upon transition, remaining connected to the posterior cingulate cortex (PCC) via different signal pathways.
  • Multiple connectivity modes within the DMN were identified.

Conclusions:

  • The findings provide a biological explanation for the DMN's robustness and variation.
  • Multiple connectivity modes offer a new perspective on DMN topology and function.
  • This study advances the understanding of intrinsic brain network dynamics and connectivity.