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 AmericaFull Article | PDF Article
Harvey S. Smallman and Donald I. A. MacLeod
J. Opt. Soc. Am. A 11(8) 2169-2183 (1994)
R. E. Fredericksen, Peter J. Bex, and Frans A. J. Verstraten
J. Opt. Soc. Am. A 14(1) 1-12 (1997)
Hugh R. Wilson, Randolph Blake, and D. Lynn Halpern
J. Opt. Soc. Am. A 8(1) 229-236 (1991)