Temporary monocular occlusion facilitates binocular fusion during rivalry

Area of Science:

• Neuroscience
• Ophthalmology
• Visual Perception

Background:

• Monocular patching in adults induces brain plasticity, enhancing the deprived eye's visual contribution.
• Previous studies suggest monocular deprivation alters excitatory-inhibitory balance in the visual cortex.
• Existing research on monocular patching primarily uses binocular rivalry to measure exclusive visibility, neglecting mixed visibility.

Purpose of the Study:

• To investigate the effects of short-term monocular occlusion on mixed and exclusive percepts during binocular rivalry.
• To test the hypothesis that patching increases mixed percepts due to altered excitatory-inhibitory balance.
• To explore the duration of these effects after patch removal.

Main Methods:

• Two experiments were conducted using binocular rivalry paradigms.
• Participants underwent short-term monocular patching.
• The fraction and duration of mixed and exclusive visibility periods were quantified.

Main Results:

• Monocular deprivation significantly increased the fraction and median duration of mixed visibility during binocular rivalry.
• These effects persisted for at least one hour after patch removal.
• Superimposition (fused percepts) was specifically enhanced, rather than piecemeal mixtures.

Conclusions:

• Temporary monocular patching enhances fused binocular percepts, likely via reduced interocular inhibition.
• This study reveals novel effects of monocular deprivation on binocular rivalry beyond the known eye-dominance shift.
• Findings suggest plasticity in adult visual processing, impacting how information from both eyes is integrated.