title: The cyclopean ternus display and the perception of element versus group movement.
abstract: This study investigated the perception of bistable stroboscopic motion (Ternus display) with cyclopean stimuli created from retinal disparity embedded in dynamic random-element stereograms, the responses to which arise at binocular-integration levels of the visual system. To provide comparison data, observers were also tested with luminance-domain stimuli matched as closely as possible to their cyclopean counterparts. The results showed that the perception of element vs group movement was similar for both stimulus domains: element movement predominated at short interstimulus intervals (ISIs) while group movement predominated at long ISIs, and there was a tendency for a greater percentage of group movement to occur with a longer frame duration. These results cast suspicion on the interpretation of bistable motion that assumes element movement is a signature of a lower-level, short-range motion system whereas group movement is a signature of a higher-level, long-range system; both percepts are engendered at binocular-integration levels of vision.
authors.affiliation: Department of Psychology, Washington State University, Pullman 99164.
authors.forename: R
authors.initials: R
authors.lastname: Patterson
authors.forename: P
authors.initials: P
authors.lastname: Hart
authors.forename: D
authors.initials: D
authors.lastname: Nowak
mesh_terms: D003867:Depth Perception / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D009039:Motion Perception / Q000502:physiology*; D010364:Pattern Recognition, Visual / Q000502:physiology; D010775:Photic Stimulation; D013997:Time Factors; D015348:Vision, Binocular / Q000502:physiology