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Network Analysis of the Default Mode Network Using Functional Connectivity MRI in Temporal Lobe Epilepsy
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EEG functional connectivity is partially predicted by underlying white matter connectivity.

C J Chu1, N Tanaka2, J Diaz3

  • 1Department of Neurology, Massachusetts General Hospital, Boston, MA, USA; Harvard Medical School, Boston, MA, USA.

Neuroimage
|December 24, 2014
PubMed
Summary

Brain functional networks partially mirror structural connectivity. Higher frequency brain activity shows greater dependence on structural support, revealing how anatomy shapes brain dynamics.

Keywords:
DTIElectrical source imagingHigh density EEGProbabilistic tractographyStructural networks

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Area of Science:

  • Neuroscience
  • Brain Connectivity
  • Systems Neuroscience

Background:

  • Brain networks are modeled as structural (anatomical) and functional (physiological coupling).
  • The relationship between structural and functional brain networks is not fully understood.
  • How frequency-specific brain communication relates to structural connectivity is unexplored.

Purpose of the Study:

  • To investigate the relationship between functional brain networks and underlying structural connectivity.
  • To explore how structural connections influence functional connectivity across different frequency bands.

Main Methods:

  • Functional networks were inferred from electroencephalography (EEG) source imaging.
  • Structural connectivity was determined using probabilistic white matter tractography.
  • Associations between functional and structural networks were analyzed across broadband and seven frequency bands.

Main Results:

  • Cortical networks derived from EEG partially reflect underlying white matter connectivity (direct and indirect).
  • Functional connectivity was significantly reduced in higher frequency bands when structural support was absent.
  • Lower frequency bands showed less reduction in functional connectivity without structural support.

Conclusions:

  • Functional and structural brain networks are interdependent.
  • Higher frequency brain rhythms rely more heavily on structural connections for coupling.
  • Brain anatomy directly influences emergent brain dynamics at faster timescales.