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Interhemispheric integration of visual processing during task-driven lateralization.

Klaas E Stephan1, John C Marshall, Will D Penny

  • 1Wellcome Trust Centre for Neuroimaging, Institute of Neurology, University College London, London WC1N 3BG, United Kingdom. k.stephan@fil.ion.ucl.ac.uk

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|March 30, 2007
PubMed
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Interhemispheric integration (IHI) mechanisms are context-dependent. Specific visual areas facilitate asymmetric or bidirectional information transfer between brain hemispheres during lateralized tasks.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Interhemispheric integration (IHI) mechanisms are not fully understood, especially for lateralized cognitive functions.
  • Existing theories of IHI require further neurophysiological validation.

Purpose of the Study:

  • To investigate context-dependent IHI mechanisms using functional magnetic resonance imaging (fMRI).
  • To differentiate between competing theories of IHI in visual processing streams.

Main Methods:

  • Dynamic causal modeling (DCM) was applied to fMRI data from two visual tasks with opposite hemispheric dominance.
  • Bayesian model selection was used to identify effective connectivity patterns.

Main Results:

Related Experiment Videos

  • In the ventral stream (letter judgments), asymmetric information transfer occurred from the right to the left hemisphere via specific areas (lingual and fusiform gyri).
  • In the dorsal stream (spatial judgments), bidirectional interhemispheric coupling increased, involving the superior parietal gyrus.

    • Conclusions:

    • Neurophysiological evidence supports context-dependent IHI mechanisms.
    • Specific visual areas implement distinct IHI strategies based on task demands and lateralization.