title: Geometric and induced effects in binocular stereopsis and motion parallax.
abstract: This paper examines and contrasts motion-parallax analogues of the induced-size and induced-shear effects with the equivalent induced effects from binocular disparity. During lateral head motion or with binocular stereopsis, vertical-shear and vertical-size transformations produced 'induced effects' of apparent inclination and slant that are not predicted geometrically. With vertical head motion, horizontal-shear and horizontal-size transformations produced similar analogues of the disparity induced effects. Typically, the induced effects were opposite in direction and slightly smaller in size than the geometric effects. Local induced-shear and induced-size effects could be elicited from motion parallax, but not from disparity, and were most pronounced when the stimulus contained discontinuities in velocity gradient. The implications of these results are discussed in the context of models of depth perception from disparity and structure from motion.
authors.affiliation: Department of Computer Science, Centre for Vision Research, York University, Ont., Toronto, Canada M3J 1P3. allison@cs.yorku.ca
authors.forename: Robert S
authors.initials: RS
authors.lastname: Allison
authors.forename: Brian J
authors.initials: BJ
authors.lastname: Rogers
authors.forename: Mark F
authors.initials: MF
authors.lastname: Bradshaw
mesh_terms: D003867:Depth Perception / Q000502:physiology*; D019416:Head Movements / Q000502:physiology; D006801:Humans; D009039:Motion Perception / Q000502:physiology*; D015357:Vision Disparity; D015348:Vision, Binocular / Q000502:physiology