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Interocular Grouping in Perceptual Rivalry Localized with fMRI.

Athena Buckthought1, Lisa E Kirsch2, Jeremy D Fesi2

  • 1School of Physical and Occupational Therapy, McGill University, Montreal, QC, H9G 1A4, Canada.

Brain Topography
|April 20, 2021
PubMed
Summary
This summary is machine-generated.

Interocular grouping during visual rivalry activates additional brain areas, particularly in the intraparietal sulcus and lateral occipital cortex. This suggests spatial integration is key for processing competing visual inputs.

Keywords:
BinocularFlicker-and-swapGestaltIllusory contoursLateral occipitalMonocular

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Bistable perception and visual illusions like binocular rivalry offer insights into visual input integration.
  • Previous fMRI studies identified cortical networks involved in binocular rivalry using replay control conditions.
  • Interocular grouping, where elements from different eyes are perceptually linked, is a less understood aspect of rivalry.

Purpose of the Study:

  • To investigate the neural correlates of interocular grouping during binocular and stimulus rivalry.
  • To identify novel cortical areas activated by interocular grouping compared to rivalry without grouping.
  • To compare the neural networks involved in interocular grouping with those previously identified for rivalry.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to study brain activity.
  • Participants viewed ambiguous images inducing binocular rivalry, with and without interocular grouping.
  • Stimulus rivalry (eye-swap) was used as a control, with similar analyses performed.

Main Results:

  • Interocular grouping led to increased activation in cortical areas, with a right hemisphere lateralization shift.
  • Direct comparison revealed focused activity in the intraparietal sulcus and lateral occipital areas (LO1, IP2, IP0-IP2) during grouping.
  • Stimulus rivalry yielded similar results, with greater right superior parietal cortex recruitment for binocular rivalry.

Conclusions:

  • Spatial integration, facilitated by interocular grouping, involves distinct but overlapping networks with rivalry mechanisms.
  • The lateral occipital/intraparietal cortex plays a crucial role in spatial integration of competing binocular representations.
  • These findings suggest that image grouping mechanisms operate similarly on competing visual stimuli regardless of the rivalry type.