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Effective connectivity within the distributed cortical network for face perception.

Scott L Fairhall1, Alumit Ishai

  • 1Institute of Neuroradiology, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland.

Cerebral Cortex (New York, N.Y. : 1991)
|December 28, 2006
PubMed
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The human brain processes faces using a network of visual, limbic, and prefrontal regions. Emotional and famous faces dynamically alter connections within this face perception network.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Functional Neuroimaging

Background:

  • Face perception involves a distributed cortical network, including core visual regions and extended limbic/prefrontal areas.
  • Core regions process invariant facial features, while extended regions handle changeable aspects.

Purpose of the Study:

  • Investigate effective connectivity and functional organization within the face perception network.
  • Determine the connectional pathway (ventral vs. dorsal) between core and extended systems.
  • Examine how emotional valence and fame modulate functional coupling within the network.

Main Methods:

  • Functional Magnetic Resonance Imaging (fMRI) to measure brain activity.
  • Dynamic Causal Modeling (DCM) to infer effective connectivity.

Related Experiment Videos

  • Analysis of functional coupling alterations based on face stimuli.

    • Main Results:

    • The core visual system exhibits hierarchical, feed-forward organization.
    • The fusiform gyrus (FG) is the primary driver of influence on the extended system.
    • Emotional faces enhance FG-amygdala coupling; famous faces enhance FG-orbitofrontal cortex coupling.

    Conclusions:

    • The face perception network shows content-specific, dynamic alterations in functional coupling.
    • Demonstrates distinct pathways for processing emotional and famous faces within the visual-limbic and visual-prefrontal systems.