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Related Experiment Video

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How to Build a Dichoptic Presentation System That Includes an Eye Tracker
05:48

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Published on: September 6, 2017

Frontoparietal activity and its structural connectivity in binocular rivalry.

Juliane C Wilcke1, Robert P O'Shea, Richard Watts

  • 1Department of Psychology, University of Canterbury, Christchurch, New Zealand. juliane.wilcke@gmail.com

Brain Research
|September 29, 2009
PubMed
Summary

Investigating visual awareness using binocular rivalry, this study identified key brain regions and their connections. Findings reveal distinct neural activity patterns and anatomical pathways in the right hemisphere, crucial for conscious perception.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Visual awareness involves complex brain processes.
  • Binocular rivalry offers a unique paradigm to study these processes.
  • Previous studies often used less optimal comparison conditions.

Purpose of the Study:

  • To identify brain areas associated with visual awareness during binocular rivalry.
  • To map the anatomical interconnections between these brain regions.
  • To differentiate rivalry-related activity from permanent suppression.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) to measure brain activity.
  • Diffusion tensor imaging (DTI) with probabilistic tractography to map white matter pathways.
  • Comparison of binocular rivalry with binocular fusion as a control condition.
  • Event-related fMRI analysis time-locked to perceptual alternations.

Main Results:

  • Increased fMRI signal observed in right frontal, parietal, and occipital regions during rivalry.
  • Neural activity patterns during rivalry differed from permanent suppression.
  • Specific activity in the right superior parietal lobule was linked to perceptual alternations.
  • Probabilistic tractography revealed white matter connections between functionally identified areas, including long-distance tracts like the inferior occipitofrontal fasciculus.

Conclusions:

  • The right frontal, parietal, and occipital cortices are involved in visual awareness during binocular rivalry.
  • Distinct but adjacent areas within the right parietal cortex may contribute to different aspects of rivalry.
  • Anatomical pathways, such as the inferior occipitofrontal fasciculus, likely support communication within the network underlying conscious perception changes.