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Related Experiment Video

Updated: May 9, 2026

Developing Neuroimaging Phenotypes of the Default Mode Network in PTSD: Integrating the Resting State, Working Memory, and Structural Connectivity

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Published on: July 1, 2014

The dynamic reorganization of the default-mode network during a visual classification task.

Wei Gao¹, John H Gilmore, Sarael Alcauter

¹Department of Radiology and Biomedical Research Imaging Center, University of North Carolina at Chapel Hill Chapel Hill, NC, USA.

Frontiers in Systems Neuroscience

|July 31, 2013

Summary

The default-mode network dynamically reorganizes its function based on cognitive demands. Its internal desynchronization and external integration correlate with task performance and reaction time, offering new insights into brain network dynamics.

Keywords:

default-mode network dynamic reorganization functional connectivity resting-state task-dependent

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Area of Science:

Neuroscience
Cognitive Neuroscience
Functional Neuroimaging

Background:

The default-mode network (DMN) exhibits versatile functions, yet its operational mechanism is not fully understood.
A dynamic perspective suggests the DMN's function arises from reorganizing interactions based on cognitive load.

Purpose of the Study:

To investigate the dynamic reorganization of the default-mode network during cognitive tasks.
To explore the relationship between DMN dynamics and task performance metrics.

Main Methods:

Functional connectivity magnetic resonance imaging (fc-MRI) was employed across four experimental states.
Analysis focused on changes in within-network and outside-network functional interactions of the DMN.

Main Results:

The DMN showed decreased within-network synchronization and increased outside-network integration when shifting from rest to a visual task.
These dynamic changes were task-dependent and reversed upon returning to rest.
Within-network desynchronization correlated with reaction time; outside-network integration correlated with task accuracy.

Conclusions:

The default-mode network undergoes dynamic reorganization in response to cognitive demands.
These dynamics are linked to behavioral outcomes, supporting a functional view of the DMN.
Future research should emphasize the dynamic nature of the DMN for a comprehensive understanding.