title: Convexity Bias and Perspective Cues in the Reverse-Perspective Illusion.
abstract: The present experiment was designed to examine the roles of painted linear perspective cues, and the convexity bias that are known to influence human observers' perception of three-dimensional (3D) objects and scenes. Reverse-perspective stimuli were used to elicit a depth-inversion illusion, in which far points on the stimulus appear to be closer than near points and vice versa, with a 2 (Type of stimulus) × 2 (Fixation mark position) design. To study perspective, two types of stimuli were used: a version with painted linear perspective cues and a version with blank (unpainted) surfaces. To examine the role of convexity, two locations were used for the fixation mark: either in a locally convex or a locally concave part of each stimulus (painted and unpainted versions). Results indicated that the reverse-perspective illusion was stronger when the stimulus contained strong perspective cues and when observers fixated a locally concave region within the scene.
authors.affiliation: Department of Psychology and Counseling, Marywood University, Scranton, PA, USA.
authors.forename: Joshua J
authors.initials: JJ
authors.lastname: Dobias
authors.affiliation: Department of Biomedical Engineering and Laboratory of Vision Research, Rutgers University, Piscataway, NJ, USA.
authors.forename: Thomas V
authors.initials: TV
authors.lastname: Papathomas
authors.affiliation: Department of Statistics, The Pennsylvania State University, University Park, PA, USA.
authors.forename: Vanja M
authors.initials: VM
authors.lastname: Vlajnic
keywords: Three-dimensional shape; convexity bias; fixation location; linear perspective; reverse perspective; visual context