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Related Experiment Video

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Dynamic Inter-subject Functional Connectivity Reveals Moment-to-Moment Brain Network Configurations Driven by Continuous or Communication Paradigms
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Ongoing dynamics in large-scale functional connectivity predict perception.

Sepideh Sadaghiani1, Jean-Baptiste Poline2, Andreas Kleinschmidt3

  • 1Helen Wills Neuroscience Institute, University of California, Berkeley, CA 94720; sepideh.sadaghiani@gmail.com.

Proceedings of the National Academy of Sciences of the United States of America
|June 25, 2015
PubMed
Summary

Ongoing brain activity, measured as functional connectivity, predicts auditory perception. Reduced network modularity before a stimulus is linked to missed perceptions, suggesting network structure impacts performance.

Keywords:
brain networksclassificationdynamicsfunctional connectivitygraph theory

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Network Science

Background:

  • Most brain activity is ongoing and not tied to external events.
  • Functional connectivity, the synchronized activity between brain regions, changes dynamically over time.
  • The behavioral relevance of these continuous brain dynamics is not well understood.

Purpose of the Study:

  • To investigate if ongoing changes in baseline functional connectivity correlate with auditory perception.
  • To determine if brain network structure influences the ability to detect auditory stimuli.

Main Methods:

  • Utilized a continuous auditory detection task with long interstimulus intervals.
  • Applied multivariate classification to predict perception based on prestimulus functional connectivity.
  • Employed graph theoretical measures to analyze functional network differences between perceived and missed stimuli.

Main Results:

  • Functional connectivity patterns preceding a target sound predicted whether it was heard or missed.
  • Missed perceptions were associated with reduced network modularity, particularly in default mode and visual networks.
  • Reduced modularity stemmed from decreased within-network and increased across-network connectivity before missed stimuli.

Conclusions:

  • Dynamic changes in baseline functional connectivity significantly influence moment-to-moment behavioral performance.
  • A highly modular brain network structure appears beneficial for efficient perception.
  • Prestimulus functional connectivity provides predictive information about subsequent perception, independent of activity amplitude.