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Updated: Jun 20, 2026

How to Create and Use Binocular Rivalry

How to Create and Use Binocular Rivalry

Published on: November 10, 2010

Suppression during binocular rivalry broadens orientation tuning.

Sam Ling¹, Randolph Blake

¹Department of Psychology, Vanderbilt University, Nashville, TN 37203, USA. s.ling@vanderbilt.edu

Psychological Science

|October 1, 2009

Summary

Binocular rivalry suppression degrades visual perception by increasing neural noise. This study reveals broader orientation tuning under suppression, leading to reduced signal fidelity and impaired stimulus discriminability.

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Area of Science:

Neuroscience
Perceptual Psychology
Visual Cognition

Background:

Binocular rivalry is a phenomenon where competing stimuli presented to each eye result in one stimulus being suppressed from awareness.
Previous research indicates that suppression during binocular rivalry attenuates the signal strength of the suppressed stimulus.
The impact of suppression on the fidelity of sensory representations remains largely unexplored.

Purpose of the Study:

To investigate the influence of binocular rivalry suppression on signal fidelity.
To determine if noise contributes to the degradation of percepts under suppression.
To identify the source of noise introduced by suppression.

Main Methods:

Psychometric functions were measured for stimuli presented under conditions of dominance and suppression (Experiment 1).
The orientation bandwidth of noise masking was examined under suppression to identify the source of noise (Experiment 2).

Main Results:

Psychometric function slopes were shallower under suppression, indicating increased noise in signal representation.
Orientation tuning bandwidth significantly broadened under suppression.
Suppression weakens stimulus discriminability through both reduced signal strength and increased neural noise due to broader tuning.

Conclusions:

Noise plays a significant, previously unrecognized role in degrading percepts during binocular rivalry suppression.
Broader orientation tuning under suppression contributes to reduced signal fidelity and impaired discriminability.
These findings offer new insights into the neural mechanisms underlying visual awareness and suppression.