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Rivalry-Like Neural Activity in Primary Visual Cortex in Anesthetized Monkeys.

Haoran Xu1, Chao Han1, Ming Chen1

  • 1Institute of Neuroscience, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, and University of Chinese Academy of Sciences, Shanghai 200031, China and State Key Laboratory of Cognitive Neuroscience and Learning, IDG/McGovern Institute for Brain Research, Collaborative Innovation Center for Brain Science, Beijing Normal University, Beijing 100875, China.

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Summary

Binocular rivalry, the alternating perception of two images, occurs in the primary visual cortex (V1) even without conscious awareness. This suggests automatic visual processing plays a key role in resolving ambiguous visual input.

Keywords:
anesthetizedattentionbinocular rivalryocular dominanceoptical imagingstriate cortex

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Cognitive Science

Background:

  • Binocular rivalry involves alternating perception between two incongruent images presented to each eye.
  • The primary visual cortex (V1) is known to be crucial for rivalry perception.
  • The role of conscious awareness in V1's rivalry activity remains unclear.

Purpose of the Study:

  • To investigate whether binocular rivalry activity in V1 depends on conscious processing.
  • To examine V1 responses in anesthetized monkeys during binocularly incongruent stimulation.

Main Methods:

  • Intrinsic signal optical imaging was used to observe V1 activity.
  • Single-trial analysis was employed to analyze neural responses.
  • Monkeys were subjected to general anesthesia during the experiment.

Main Results:

  • Alternating activation of ocular dominance columns in V1 was observed.
  • Left- and right-eye columns showed counterphase activation.
  • Activation patterns mimicked those seen in conscious human observers.

Conclusions:

  • Binocular rivalry can occur in V1 independently of consciousness.
  • Low-level automatic mechanisms are critical for resolving visual ambiguity.
  • These findings highlight the significant role of automatic visual processing in perception.