부산대학교 도서관

To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/S0042-6989(97)00211-3 Byline: Martin J.M. Lankheet, Martijn Palmen (*) Keywords: Stereopsis; Binocular correlation; Transparency; Segregation Abstract: Stereoscopic segregation in depth was studied using two superimposed frontoparallel surfaces displayed in dynamic random dot stereograms. The two patterns were positioned symmetrically in front of and behind a binocular fixation point. They were either stationary, or they could move relative to each other. Sensitivity for segregation was established by adding gaussian distributed disparity noise to the disparities specifying the two planes, and finding the noise amplitude that gave threshold segregation performance. Observers easily segregate the two surfaces for disparity differences between [approximately equal to] 6 and 30-40 arcmin. Motion contrast, which by itself provides no cue to perform the task, greatly improves sensitivity for segregation. Noise tolerance rises by a factor of two or more when the patterns move at different speeds, or in different (frontoparallel) directions. The effect increases with directional difference, but the optimal directional difference deviates from 180 deg. The optimal speed varies with disparity difference. Thus, motion and disparity must interact in order to resolve the two transparent planes. Author Affiliation: (*) Department of Comparative Physiology and Helmholtz Instituut, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht, The Netherlands Article History: Received 12 February 1997; Accepted 16 June 1997