Coarse-fine dichotomies in human stereopsis
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Updated: Jun 22, 2026

Measuring Sensitivity to Viewpoint Change with and without Stereoscopic Cues
Published on: December 4, 2013
Laurie M Wilcox1, Robert S Allison
1Department of Psychology, Centre for Vision Research, 4700 Keele St., North York Ontario, Canada M3J1P3. lwilcox@yorku.ca
Abstract:
There is a long history of research into depth percepts from very large disparities, beyond the fusion limit. Such diplopic stimuli have repeatedly been shown to provide reliable depth percepts. A number of researchers have pointed to differences between the processing of small and large disparities, arguing that they are subserved by distinct neural mechanisms. Other studies have pointed to a dichotomy between the processing of 1st- and 2nd-order stimuli. Here we review literature on the full range of disparity processing to determine how well different proposed dichotomies map onto one another, and to identify unresolved issues.
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