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Breakdown of the brain's functional network modularity with awareness.

Douglass Godwin1, Robert L Barry2, René Marois3

  • 1Department of Psychology, franklin.d.godwin@vanderbilt.edu rene.marois@vanderbilt.edu.

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Summary

Conscious awareness involves widespread brain network changes, not just local activity. This study shows awareness increases communication between brain modules, supporting global theories of consciousness.

Keywords:
awarenessconsciousnessfunctional connectivitygraph theory

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Brain Imaging

Background:

  • Theories of awareness differ on whether conscious perception relies on local brain activity or widespread network communication.
  • Understanding the spatial scale of neural changes underlying awareness is crucial for neurobiological models.

Purpose of the Study:

  • To investigate the spatial extent of brain network alterations associated with conscious awareness.
  • To differentiate between focal and global theories of awareness using functional connectivity.

Main Methods:

  • Graph theoretical analysis of functional connectivity data.
  • Ultra-high field functional magnetic resonance imaging (fMRI) during a masked target detection task.

Main Results:

  • Awareness of a visual target correlated with decreased modularity in brain functional networks.
  • Increased intermodular functional connectivity was observed when targets were consciously perceived.

Conclusions:

  • Conscious awareness is associated with global changes in brain functional connectivity, rather than purely local effects.
  • Findings support global theories suggesting awareness emerges from widespread neural signal propagation.