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How to Create and Use Binocular Rivalry
14:34

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Does V1 response suppression initiate binocular rivalry?

Brock M Carlson1, Blake A Mitchell1, Kacie Dougherty1,2

  • 1Department of Psychology, College of Arts and Science, Vanderbilt Vision Research Center, Center for Integrative and Cognitive Neuroscience, Vanderbilt University, Nashville, TN 37235, USA.

Iscience
|July 31, 2023
PubMed
Summary
This summary is machine-generated.

Binocular rivalry (BR) involves perceiving only one eye's view. This study found that a variant, binocular rivalry flash suppression (BRFS), causes response facilitation, not suppression, in primary visual cortex (V1) neurons, suggesting an alternative BR initiation mechanism.

Keywords:
Cellular neuroscienceSensory neuroscience

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Computational Neuroscience

Background:

  • Binocular rivalry (BR) is a phenomenon where only one eye's visual input is perceived at a time.
  • The neural mechanisms initiating BR, particularly within the primary visual cortex (V1), remain under investigation.
  • Previous hypotheses suggested V1 neuronal response suppression as a key trigger for BR onset.

Purpose of the Study:

  • To investigate the role of V1 neuronal activity changes in initiating BR.
  • To test the hypothesis that V1 response suppression is required for BR initiation.
  • To explore alternative mechanisms for BR initiation using a modified BR paradigm.

Main Methods:

  • Utilized binocular rivalry flash suppression (BRFS), a variant of BR with a temporal delay between stimuli.
  • Recorded V1 neuronal spiking activity in two macaques during BRFS.
  • Compared neuronal responses during BRFS to established BR models.

Main Results:

  • BRFS induced response facilitation, not suppression, in the majority of V1 neurons.
  • A subset of V1 neurons exhibited reduced responses due to adaptive effects from asynchronous stimulus presentation.
  • These findings challenge the necessity of widespread V1 response suppression for BR initiation.

Conclusions:

  • Widespread V1 response suppression is not essential for initiating binocular rivalry.
  • Selective response suppression in a subset of V1 neurons may serve as an alternative trigger for BR.
  • The findings provide new insights into the neural dynamics underlying visual competition and perception.