3D Shape Discrimination Using Relative Disparity Derivatives
Psychophysics, Disparity, Depth, Shape perception, Surface
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.
Vreven, Dawn L.. "3D Shape Discrimination Using Relative Disparity Derivatives." Vision Research 46, no. 25 (2006): 4181-4192. Accessed at http://digitalcommons.framingham.edu/psych_facpub/11