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Related Experiment Videos

V1 activity is reduced during binocular rivalry.

Sang-Hun Lee1, Randolph Blake

  • 1Psychology, Stanford University, Stanford, CA, USA. lee@white.stanford.edu

Journal of Vision
|April 8, 2003
PubMed
Summary
This summary is machine-generated.

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Binocular rivalry causes neural suppression in the primary visual cortex (V1). This suppression reduces V1 activity by 48-77%, regardless of stimulus complexity, confirming early visual processing involvement.

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Binocular rivalry involves alternating perception of incompatible monocular stimuli.
  • Suppression of one stimulus from awareness occurs during binocular rivalry.
  • The neural basis and early cortical involvement in rivalry suppression are actively researched.

Purpose of the Study:

  • To investigate whether rivalry suppression occurs in the primary visual cortex (V1).
  • To quantify the degree of neural activity reduction in V1 during binocular rivalry.
  • To determine if stimulus complexity affects V1 suppression during rivalry.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure V1 activity.
  • Binocular rivalry was induced with incompatible monocular stimuli.

Related Experiment Videos

  • V1 activity during rivalry was compared to reference conditions of complete and no suppression.

    • Main Results:

    • V1 activity during rivalry was significantly reduced, falling between complete and no suppression levels.
    • Neural activity associated with the suppressed stimulus decreased by 48% to 77%.
    • Similar suppression patterns were observed with both simple and complex stimuli (e.g., face and house).

    Conclusions:

    • Neuronal events related to binocular rivalry occur as early as V1.
    • Robust neural suppression is demonstrated in V1 during rivalry.
    • Stimulus complexity does not alter the extent of neural suppression in V1 during rivalry.