Open AccessSimilar Mechanisms Underlie the Detection of Horizontal and Vertical Disparity Corrugations
Author(s) -
Nirel Witz,
Jiawei Zhou,
Robert F. Hess
Publication year - 2014
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0084846
Subject(s) - horizontal and vertical , spatial frequency , narrowband , sensitivity (control systems) , anisotropy , broadband , optics , contrast (vision) , physics , materials science , biological system , mathematics , biology , geometry , electronic engineering , engineering
Our aim was to compare sensitivity for horizontal and vertical disparity corrugations and to resolve whether these stimuli are processed by similar or radically different underlying mechanisms. We measure global disparity sensitivity as a function of carrier spatial frequency for equi-detectable carriers and found a similar optimal carrier relationship for vertical and horizontal stimuli. Sensitivity as a function of corrugation spatial frequency for stimuli of comparable spatial summation and composed of optimal, equi-detectable narrowband carriers did not significantly differ for vertical and horizontal stimuli. A small anisotropy was revealed when fixed, high contrast broadband carriers were used. In a separate discrimination-at-threshold experiment, multiple mechanisms of similar tuning were revealed to underlie the detection of both vertical and horizontal disparity corrugations. We conclude that the processing of the horizontal and vertical disparity corrugations occurs along similar lines.