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High frequencies reveal the default mode network (DMN) is actively recruited during cognitive tasks, not simply deactivated. This suggests high-frequency brain activity is crucial for functional integration and cognitive processing.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Functional Neuroimaging

Background:

  • Default mode network (DMN) functional connectivity is traditionally studied at low frequencies (<0.1 Hz).
  • High-frequency fluctuations in resting-state fMRI are increasingly explored for their role in functional connectivity.
  • The DMN's role during cognitive tasks remains incompletely understood due to limited systematic investigation.

Purpose of the Study:

  • To investigate the contribution of high-frequency fluctuations to DMN connectivity.
  • To examine the relationship between the DMN and dorsal attention network (DAN) at rest and during task execution.
  • To understand the DMN's functional role in cognitive processing.

Main Methods:

  • Analysis of resting-state and task-based fMRI data.
  • Examination of functional connectivity within and between the DMN and DAN.
  • Inclusion and exclusion of high-frequency bands during data analysis.

Main Results:

  • High-frequency inclusion altered DMN-DAN connectivity, reducing anticorrelation and increasing positive connectivity.
  • Increased positive DMN-DAN connectivity was specific to task execution, highlighting high-frequency roles in functional integration.
  • Within-DMN connectivity during tasks correlated with reaction time (RT) only when high frequencies were included.

Conclusions:

  • The DMN is actively recruited during cognitive tasks, challenging the notion of simple deactivation.
  • High-frequency brain activity plays a significant role in inter-network communication and cognitive function.
  • This study provides evidence for the multiband nature of functional connectivity and DMN's active engagement in cognition.