title: Exposure duration affects the perceived direction of cyclopean type II plaids.
abstract: This study investigated the effect of exposure duration on the perceived direction of cyclopean Type I and Type II plaids moving in the X/Y plane. The cyclopean plaids were created from grating components defined by binocular disparity embedded in a dynamic random-dot stereogram. The results showed that the cyclopean Type I plaid appeared to move in the intersection-of-constraints (IOC) direction across the range of exposures tested. However, the cyclopean Type II plaids appeared to move in a direction different from the IOC with short exposures but near the IOC with long exposures. This perceived directional shift was also obtained with luminance-defined Type II plaids. A common pattern-motion mechanism that processes cyclopean and luminance motion signals appears responsible for the perceived directional shift of the Type II plaids.
authors.affiliation: Department of Psychology, Washington State University, 99164-4820, Pullman, WA, USA. rpatter@mail.wsu.edu
authors.forename: R
authors.initials: R
authors.lastname: Patterson
authors.forename: S
authors.initials: S
authors.lastname: Shorter
authors.forename: C
authors.initials: C
authors.lastname: Bowd
authors.forename: R
authors.initials: R
authors.lastname: Freudenberg
authors.forename: S
authors.initials: S
authors.lastname: Becker
mesh_terms: D003867:Depth Perception / Q000502:physiology; D006801:Humans; D008433:Mathematics; D009039:Motion Perception / Q000502:physiology*; D013997:Time Factors; D015357:Vision Disparity / Q000502:physiology