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Combining Transcranial Magnetic Stimulation and fMRI to Examine the Default Mode Network
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Combining Transcranial Magnetic Stimulation and fMRI to Examine the Default Mode Network

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Task-Dependent Modulation of Effective Connectivity within the Default Mode Network.

Baojuan Li1, Xiang Wang, Shuqiao Yao

  • 1Department of Automatic Control, College of Mechatronics and Automation, National University of Defense Technology Changsha, China.

Frontiers in Psychology
|June 28, 2012
PubMed
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Cognitive tasks enhance effective connectivity within the default mode network (DMN), increasing its sensitivity. This study used dynamic causal modeling to reveal how task engagement alters directed connections in the DMN.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Brain Imaging

Background:

  • The default mode network (DMN) shows deactivation and altered functional connectivity during task processing.
  • The modulation of effective connectivity within the DMN by tasks remains poorly understood.

Purpose of the Study:

  • To investigate how task performance modulates directed effective connectivity within the DMN.
  • To utilize dynamic causal modeling (DCM) for analyzing task-related connectivity changes.

Main Methods:

  • Used stochastic DCM to analyze effective connectivity in 16 healthy subjects during rest and a gender judgment task.
  • Defined four subject-specific regions of interest within the DMN: posterior cingulate cortex, bilateral lateral parietal cortex, and medial prefrontal cortex.
  • Employed group independent component analysis to identify DMN components.
Keywords:
default mode networkeffective connectivityfunctional magnetic resonance imagingindependent component analysisstochastic dynamic causal modeling

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Main Results:

  • Task performance enhanced extrinsic (between-region) connectivity within the DMN compared to rest.
  • A universal decrease in intrinsic (self-inhibitory) connectivity was observed during the task.
  • These changes suggest a systematic modulation of DMN effective connectivity by cognitive and attentional demands.

Conclusions:

  • Cognitive and attentional set systematically modulate the effective connectivity of the DMN.
  • Task-induced changes optimize DMN sensitivity to inputs and distributed processing.
  • Findings provide insights into how cognitive engagement reconfigures intrinsic brain network dynamics.