Exposure duration affects the perceived direction of cyclopean type II plaids.
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.
Patterson
R
R
Department of Psychology, Washington State University, 99164-4820, Pullman, WA, USA. rpatter@mail.wsu.edu
Shorter
S
S
Bowd
C
C
Freudenberg
R
R
Becker
S
S
D003867:Depth Perception / Q000502:physiology; D006801:Humans; D008433:Mathematics; D009039:Motion Perception / Q000502:physiology*; D013997:Time Factors; D015357:Vision Disparity / Q000502:physiology