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Weak task synchronization of default mode network in task based paradigms.

Vaibhav Tripathi1, Rahul Garg2

  • 1Department of Psychological and Brain Sciences, Boston University, MA, 02215, USA.

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|February 5, 2022
PubMed
Summary
This summary is machine-generated.

The brain's Default Mode Network (DMN) shows variable deactivation during attention tasks, challenging its role as strictly task-negative. This intrinsic processing network exhibits low synchronization across trials and subjects, unlike sensory regions.

Keywords:
Default mode networkInter subject correlationSynchronizationTask-negativeVariability

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Brain Imaging

Background:

  • The Default Mode Network (DMN) is typically deactivated by external attention tasks.
  • It's associated with internal cognition like memory recall and future planning.
  • Recent studies suggest bottom-up attention influences DMN activity.

Purpose of the Study:

  • To investigate the variability in DMN deactivation across trials and subjects.
  • To test if DMN de-engagement is stimulus-locked or exhibits significant variability.
  • To compare DMN synchronization with attention and sensory networks.

Main Methods:

  • Developed Inter Trial Temporal Synchronization Analysis (IT-TSA) and Inter Subject TSA (IS-TSA).
  • Analyzed four public fMRI datasets (223 subjects) across seven cognitive tasks.
  • Examined functional connectivity and synchronization in DMN and sensory regions.

Main Results:

  • DMN regions showed significantly lower stimulus-locked synchronization across trials and subjects compared to early sensory regions.
  • This variability was consistent across different cognitive tasks.
  • Findings indicate DMN deactivation is not strictly stimulus-locked.

Conclusions:

  • Challenges the view of the DMN as purely task-negative.
  • Supports the DMN as an active component involved in intrinsic processing.
  • Highlights differential and non-linear deactivation of DMN during extrinsic processes.