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Stable functional networks exhibit consistent timing in the human brain.

Julio I Chapeton1, Sara K Inati2, Kareem A Zaghloul1

  • 1Surgical Neurology Branch, NINDS, National Institutes of Health, Bethesda, MD 20892, USA.

Brain : a Journal of Neurology
|April 2, 2017
PubMed
Summary
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This study reveals consistent timing in brain communication pathways. These stable, directed functional networks are crucial for large-scale cortical communication, offering insights into brain connectivity.

Area of Science:

  • Neuroscience
  • Systems Neuroscience
  • Computational Neuroscience

Background:

  • Understanding large-scale human functional brain networks remains challenging.
  • The timing, stability, and direction of communication between cortical regions are not fully understood.
  • Neuronal communication timing is clear at the cellular level but less so at larger spatial scales.

Purpose of the Study:

  • To identify brain connections with consistent timing using effective connectivity measures.
  • To investigate if communication between brain regions involves predictable time delays.
  • To explore the stability and directionality of these functional brain networks.

Main Methods:

  • Utilized intracranial electroencephalography (iEEG) data from nine epilepsy patients.
Keywords:
EEGclinical neurophysiologyintracranial EEGneuroanatomytemporal lobe

Related Experiment Videos

  • Employed time-lagged mutual information to quantify effective connectivity.
  • Identified statistically significant increases in mutual information at consistent time delays.

    • Main Results:

    • Discovered sparse, directed functional networks with stable connections over minutes, hours, and days.
    • Observed highly preserved time delays across multiple timescales.
    • Found a preferred posterior-to-anterior temporal lobe direction of activity propagation.
    • Identified small-world network architecture with predominantly local connections.

    Conclusions:

    • Cortical regions exhibit functional relationships with well-defined and consistent timing.
    • The stability of these timed connections suggests reliable pathways for large-scale cortical communication.
    • This research provides a novel method for mapping directed, timed brain networks.