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Related Experiment Video

Updated: May 24, 2026

How to Create and Use Binocular Rivalry

How to Create and Use Binocular Rivalry

Published on: November 10, 2010

Depth from binocular rivalry without spatial disparity

¹Centre for Vision Research, York University, North York, Ontario, Canada.

|January 1, 1995

Summary

This summary is machine-generated.

New stereoscopic effects, like the sieve effect, emerge from dichoptic stimuli without binocular disparity. These visual phenomena demonstrate novel depth perception mechanisms beyond traditional disparity cues.

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Area of Science:

Vision Science
Perceptual Psychology
Neuroscience

Background:

Binocular disparity is the primary cue for stereoscopic depth perception.
Previous research has not extensively explored stereoscopic effects generated without physical binocular disparity.

Purpose of the Study:

To investigate novel stereoscopic effects arising from dichoptic stimuli.
To characterize the conditions under which these effects, particularly the 'sieve effect,' occur and are perceived.

Main Methods:

Presentation of identical arrays of black discs to both eyes.
Superimposition of smaller white discs onto one eye's array.
Varying the size and characteristics of the discs to observe changes in perceived depth and visual effects.

Main Results:

The 'sieve effect,' an impression of a surface with holes, was observed with small superimposed white discs.
Larger discs resulted in binocular lustre instead of the sieve effect, indicating a loss of alternating rivalry.
The sieve effect requires well-defined binocular rims; it diminishes with same-sized discs or when white discs become dots, leading to apparent parallax or vergence instability.

Conclusions:

Novel stereoscopic effects can be generated using dichoptic stimuli lacking binocular disparity.
The 'sieve effect' is a distinct perceptual phenomenon dependent on specific stimulus parameters like disc size and contrast.
These findings suggest alternative mechanisms contributing to depth perception beyond conventional binocular disparity.