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Related Experiment Video

Updated: May 14, 2026

Measuring Sensitivity to Viewpoint Change with and without Stereoscopic Cues

Measuring Sensitivity to Viewpoint Change with and without Stereoscopic Cues

Published on: December 4, 2013

Phantom surfaces in da Vinci stereopsis.

Susan G Wardle¹, Barbara J Gillam

¹School of Psychology, The University of New South Wales, Sydney, Australia. s.wardle@unsw.edu.au

Journal of Vision

|February 12, 2013

Summary

The visual system creates a phantom contour to perceive depth from monocular regions, even without physical cues. This finding advances our understanding of stereoscopic edge processing and depth perception models.

Area of Science:

Vision science
Perceptual psychology
Computational neuroscience

Background:

Binocular viewing of 3D scenes involves occlusion, creating monocular regions visible to only one eye.
These monocular regions can contribute to depth perception, particularly on the nasal side of a surface.
Existing conditions for nasal monocular regions include apertures or camouflage, which were avoided in this study.

Purpose of the Study:

To investigate depth perception from monocular regions without apertures or camouflage.
To examine the formation of phantom contours and their depth precision.
To explore implications for stereopsis and edge processing models.

Main Methods:

Creation of novel stimuli featuring monocular regions with complex textures.

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Measuring Sensitivity to Viewpoint Change with and without Stereoscopic Cues

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Observer tasks involving depth matching using a probe.

Analysis of perceived depth and contour formation.

Main Results:

Observers perceived a strong phantom contour in near depth at the edge of the monocular region.
The depth of this phantom occluding surface was precisely matched to binocular disparity stimuli.
Monocular regions on the temporal side were perceived as expected by occlusion geometry, without phantom surfaces.

Conclusions:

The visual system precisely locates edges in depth lacking luminance contours using occlusion geometry and complex matching.
Findings challenge existing models of stereopsis and suggest a role for Panum's limiting case.
Phantom contours from monocular regions demonstrate a sophisticated depth perception mechanism.