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Updated: Sep 11, 2025

Developing Neuroimaging Phenotypes of the Default Mode Network in PTSD: Integrating the Resting State, Working Memory, and Structural Connectivity
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Default mode network activation at task switches reflects mental task-set structure.

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  • 1MRC Cognition and Brain Sciences Unit, University of Cambridge, Cambridge, United Kingdom.

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|August 13, 2025
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Summary
This summary is machine-generated.

The Default Mode Network (DMN) shows increased activity during task switching. Its response depends on the learning order of task groups, not the number of tasks, suggesting hierarchical organization in the brain.

Keywords:
MVPAcognitiondefault mode networkfunctional MRIswitching

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience

Background:

  • Traditional views consider the Default Mode Network (DMN) task-negative.
  • Recent studies show increased DMN activity during demanding task switches.
  • The factors modulating DMN activity during switches remain unclear.

Purpose of the Study:

  • To investigate if the DMN's response to task switches depends on task set complexity or abstract task groupings based on learning order.
  • To explore the neural mechanisms underlying task switching and cognitive control.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure brain activity.
  • Participants performed externally-focused tasks with varying numbers and learning orders.
  • Multivariate decoding was applied to analyze DMN representations.

Main Results:

  • Core DMN activation at task switches was independent of the number of currently relevant tasks.
  • DMN response was significantly influenced by the order in which task groups were learned.
  • Multivariate decoding demonstrated hierarchical representation of tasks, domains, and instruction-based groupings within the Core DMN.

Conclusions:

  • The Default Mode Network's engagement during task switching is modulated by the hierarchical structure of learned task rules.
  • As task complexity increases, the DMN may play a role in managing higher-level organizational chunks of information.
  • Findings challenge purely task-negative models of the DMN, highlighting its role in cognitive flexibility and complex task management.