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Correspondence between evoked and intrinsic functional brain network configurations.

Taylor Bolt1, Jason S Nomi1, Mikail Rubinov2,3

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Brain networks shift hubs from sensory to executive areas during tasks. This reorganization increases network clustering and global efficiency, revealing distinct intrinsic and task-based brain architectures.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Network Science

Background:

  • Previous studies focused on regional functional connectivity, overlooking network-level organizational changes.
  • Understanding shifts in brain network topology is crucial for differentiating intrinsic and task-evoked states.

Purpose of the Study:

  • To investigate changes in overall brain network organization and hub distribution between intrinsic and task-evoked states.
  • To explore how network topology quantitatively differs during rest versus task performance.

Main Methods:

  • Applied graph-theoretical analysis to Human Connectome Project neuroimaging data (N=202).
  • Utilized a within-subject design comparing resting-state and task-evoked functional connectivity.

Main Results:

  • Identified a task-general shift of high-connectivity hubs from sensorimotor/auditory regions (intrinsic) to executive control/salience network regions (task).
  • Observed increases in network clustering, global efficiency, and inter-module integration during task performance compared to the intrinsic state.

Conclusions:

  • Brain network organization significantly differs between intrinsic and task-evoked states, characterized by dynamic hub reconfigurations.
  • These findings provide novel insights into the principles governing functional brain organization and network integration.