title: The perception of shape and curvedness from binocular stereopsis and structure from motion.
abstract: The integration of binocular stereopsis and kinetic depth was measured for two distinct aspects of 3-D structure: (1) shape index, which is a measure of scale-independent structure, and (2) curvedness, which is a measure of scale-dependent structure. We found that motion contributes significantly more to judged shape index than it does to judged curvedness, and stereo contributes significantly more to judged curvedness than it does to judged shape index. This suggests that the differences in the relative contribution of motion and stereo reported here occurred because these two sources do not equally specify the scale-dependent and scale-independent aspects of surface structure. Furthermore, these results seem to be inconsistent with integration models in which the different visual cues all initially contribute to the same single representation of 3-D structure.
authors.affiliation: Department of Psychology, Ohio State University, Columbus 43210-1222, USA. jtittle@magnus.acs.ohio-state.edu
authors.forename: J S
authors.initials: JS
authors.lastname: Tittle
authors.forename: V J
authors.initials: VJ
authors.lastname: Perotti
mesh_terms: D003867:Depth Perception; D004193:Discrimination Learning; D005260:Female; D005556:Form Perception; D006801:Humans; D008297:Male; D009039:Motion Perception; D011601:Psychophysics; D015348:Vision, Binocular