The Interaction of Changing Disparity and Interocular Velocity Difference in Motion in Depth Perception
56.443, Tuesday, May 14, 2:45 - 6:45 pm, Orchid Ballroom
Joel Persinger1, Rui Ni1; 1Psychology, Liberal Arts and Sciences,Wichita State University
There are two sources of binocular information that contribute to the perception of binocular motion in depth (Rashbass & Westheimer, 1961). One source of information consists of the rate of changing disparity (CD) over time and the other consists of interocular velocity difference (IOVD). Recent research (Persinger & Ni, 2012) showed different response curves as a function of dot lifetime for CD displays and IOVD displays. The purpose of this study was to compare the stereomotion perception in CD and IOVD displays when observers sensitivity was set at a comparable level between the two types of displays. In the current study, uncorrelated random dot stereograms (URDS) were used to present displays with IOVD information only, and dynamic correlated random dot stereograms (DRDS) were used to present displays with CD information only. Dot lifetimes were selected that produced similar sensitivities to the two types of stimuli. The interaction between DRDS and URDS displays was measured using a motion aftereffect (MAE) paradigm. Observers were examined in the pretest and posttest on their sensitivities to DRDS stimuli, between which they were adapted with URDS stimuli. The results showed a significant difference in sensitivity between the pretest and posttest, indicating the adaptation to URDS displays has a significant effect on the stereomotion perception in DRDS displays.