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Tracking perceptual decision mechanisms through changes in interhemispheric functional connectivity in human visual

Teresa Sousa1,2,3,4, João V Duarte1,2,3, Gabriel N Costa1,2,3

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This summary is machine-generated.

Visual perceptual binding relies on long-range integration mechanisms. This study reveals that increased interhemispheric functional connectivity in the hMT+ region directly correlates with enhanced visual perceptual binding.

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Cognitive Neuroscience

Background:

  • The mechanisms of long-range integration in visual perceptual binding and their connection to interhemispheric functional connectivity are not well understood.
  • Previous studies relied on inferences from resting-state data, lacking paradigms for coherent binding.

Purpose of the Study:

  • To investigate the relationship between perceptual interpretation and functional connectivity during bistable interhemispheric binding versus non-binding of visual surfaces.
  • To determine if interhemispheric connectivity in the human Medial Temporal area (hMT+) is modulated by perceptual integration versus segregation of surface motion.

Main Methods:

  • Utilized a novel paradigm to study visual perceptual binding under bistable conditions.
  • Employed 7 Tesla functional Magnetic Resonance Imaging (fMRI) to measure interhemispheric functional connectivity in the hMT+ region.
  • Compared connectivity during perceptual integration (binding) versus segregation (non-binding) of visual surfaces.

Main Results:

  • Found that perceptual long-range integration of bistable motion can be tracked by changes in interhemispheric functional connectivity between the left and right hMT+.
  • Observed a tight relationship between increased interhemispheric connectivity and long-range perceptual integration.
  • Demonstrated that hMT+ interhemispheric functional connectivity reflects perceptual decision-making.

Conclusions:

  • Interhemispheric functional connectivity in hMT+ plays a pivotal role in the long-range disambiguation of bistable surface motion.
  • This study provides the first fMRI-scale evidence linking interhemispheric functional connectivity to decision-based perceptual binding.