title: Systematic distortion of perceived three-dimensional structure from motion and binocular stereopsis.
abstract: The geometric relation between physical and perceived space as specified by binocular stereopsis and structure from motion was investigated. Four experimental tasks were used, each of which required a different aspect of three-dimensional (3-D) structure to be performed accurately. To examine whether the transformation between physical and perceptual space preserved the 3-D structural properties required to perform each of our tasks, the constancy of judged shape over changes in a depicted object's viewing distance or orientation was examined. Our results reveal that observers' judgments of 3-D shape from binocular stereopsis and motion contained systematic distortions: Perceived 3-D shape from motion was not invariant over orientation change and perceived 3-D structure from stereo, and motion and stereo in combination was not invariant over changes in viewing distance.
authors.affiliation: Department of Psychology, Ohio State University, Columbus 43210, USA.
authors.forename: J S
authors.initials: JS
authors.lastname: Tittle
authors.forename: J T
authors.initials: JT
authors.lastname: Todd
authors.forename: V J
authors.initials: VJ
authors.lastname: Perotti
authors.forename: J F
authors.initials: JF
authors.lastname: Norman
mesh_terms: D003196:Computer Graphics; D003867:Depth Perception; D004215:Distance Perception; D005260:Female; D006801:Humans; D008297:Male; D009039:Motion Perception; D009903:Optical Illusions; D009949:Orientation; D010364:Pattern Recognition, Visual; D010469:Perceptual Distortion; D011601:Psychophysics; D015348:Vision, Binocular