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Developing Neuroimaging Phenotypes of the Default Mode Network in PTSD: Integrating the Resting State, Working Memory, and Structural Connectivity
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Task-positive Functional Connectivity of the Default Mode Network Transcends Task Domain.

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The default mode network (DMN) actively supports goal-directed tasks by increasing its connectivity with task-promoting brain regions, not just during rest. This flexible coupling enhances performance across diverse cognitive functions.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Brain Networks

Background:

  • The default mode network (DMN) was initially characterized by high activity during rest and decreased activity during tasks.
  • Its role evolved to include internally oriented tasks, showing increased activity.
  • The DMN's hub position suggests a more complex role in goal-directed behavior than previously understood.

Purpose of the Study:

  • To investigate task-related changes in DMN functional connectivity during both internal and external tasks.
  • To examine the DMN's functional interactions, rather than just activation levels, during goal-directed performance.
  • To test the hypothesis that the DMN exhibits 'task-positive' connectivity changes across diverse tasks.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used in 20 participants.
  • Participants performed six tasks spanning internal and external domains, alongside a resting-state scan.
  • Canonical correlation analyses assessed the association between connectivity changes and task performance.

Main Results:

  • The DMN showed significant increases in functional connectivity with task-promoting regions across all tested tasks.
  • These connectivity increases were observed regardless of whether DMN activity itself increased or decreased during tasks.
  • Task-related DMN connectivity changes correlated significantly with individual differences in task performance.

Conclusions:

  • The DMN plays a crucial role in both internal and external goal-directed tasks.
  • This role is mediated by flexible coupling with task-relevant brain regions.
  • The DMN's contribution extends beyond a 'default' mode, actively supporting cognitive performance.