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Author Spotlight: A Novel Setup to Conduct Naturalistic Laboratory Experiments with Real Human Actors in Scenarios
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Default mode network connectivity during task execution.

D Vatansever1, D K Menon1, A E Manktelow1

  • 1Division of Anaesthesia and Department of Clinical Neurosciences, School of Clinical Medicine, University of Cambridge, Cambridge, UK; Wolfson Brain Imaging Centre, University of Cambridge, Cambridge, UK.

Neuroimage
|July 30, 2015
PubMed
Summary
This summary is machine-generated.

The default mode network (DMN) is not disengaged during cognitive tasks. Instead, its functional connectivity changes dynamically, supporting task performance and faster reaction times.

Keywords:
Default mode networkFinger opposition taskFunctional connectivityGraph theoryHierarchical clustering

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Functional Neuroimaging

Background:

  • The default mode network (DMN) was traditionally viewed as deactivated during goal-directed tasks.
  • Emerging evidence suggests the DMN may play a role in cognitive demands.

Purpose of the Study:

  • To investigate the DMN's involvement in cognitive tasks.
  • To test the hypothesis that the DMN contributes to fulfilling cognitive demands.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used during a finger opposition task and fixation periods.
  • A comprehensive analysis pipeline included activation, functional connectivity, behavioral, and graph theoretical assessments.
  • Resting-state scans were acquired for comparison.

Main Results:

  • Task-specific alterations in DMN topography were observed.
  • Increased posterior cingulate cortex to left superior frontal gyrus connectivity correlated with faster reaction times.
  • Dynamic reconfiguration of DMN functional connections indicated task engagement and preserved small-world architecture.

Conclusions:

  • The DMN does not disengage during demanding cognitive tasks.
  • The DMN's dynamic reconfiguration suggests involvement in task-relevant processing.
  • The DMN may contribute to higher-level cognitive functions during tasks.