Title

3D Shape Discrimination Using Relative Disparity Derivatives

Document Type

Article

Publication Date

11-1-2006

DOI

10.1016/j.visres.2006.08.014,

Version

Citation

Publication Title

Vision Research

Keywords

Psychophysics, Disparity, Depth, Shape perception, Surface

Subject Categories

Psychology

Abstract

Three-dimensional (3D) shape discrimination could be achieved using relative disparity signals or it could be achieved using a higher-order disparity derivative detector. Two 3D shape discrimination tasks were used to distinguish between these possibilities: a within-shape task and a between-shape task. Disparity thresholds were larger when discriminating within the same shape than when discriminating between shapes. More importantly, within-shape discriminations were dependent on the pedestal disparity (distance from fixation) whereas between-shape discriminations were not. The results suggest that a mechanism sensitive to higher-order disparity derivatives can achieve discrimination between different 3D shapes.