To address the issue of whether the luminance-dependent (linear) and contrast-dependent (nonlinear) processes in stereo and motion have a common computational basis, we compare both carrier-dependent and envelope-dependent performance for these two modalities by using the same stimulus and task: two-flash apparent motion/depth for a wide range of displacements. We do this for different densities, bandwidths, contrasts, spatial frequencies, and exposure durations. The results suggest that there is concordance not only between the luminance-dependent (linear) processes of motion and stereo but also between the envelope-dependent (nonlinear) processes of both modalities. Only one exception was found, but we show this to be amenable to an explanation based on a different contrast dependence for the nonlinear mechanisms of stereo and motion. This suggests that the computational basis of linear and nonlinear processes may be similar for stereopsis and motion.
© 1999 Optical Society of America
(330.1400) Vision, color, and visual optics : Vision - binocular and stereopsis
(330.4150) Vision, color, and visual optics : Motion detection
(330.5510) Vision, color, and visual optics : Psychophysics
(330.6790) Vision, color, and visual optics : Temporal discrimination
R. F. Hess, C. L. Baker, Jr., and L. M. Wilcox, "Comparison of motion and stereopsis:linear and nonlinear performance," J. Opt. Soc. Am. A 16, 987-994 (1999)