title: Perceptual shrinkage of a one-way motion path with high-speed motion.
abstract: Back-and-forth motion induces perceptual shrinkage of the motion path, but such shrinkage is hardly perceived for one-way motion. If the shrinkage is caused by temporal averaging of stimulus position around the endpoints, it should also be induced for one-way motion at higher motion speeds. In psychophysical experiments with a high-speed projector, we tested this conjecture for a one-way motion stimulus at various speeds (4-100 deg/s) along a straight path. Results showed that perceptual shrinkage of the motion path was robustly observed in higher-speed motion (faster than 66.7 deg/s). In addition, the amount of the forwards shift at the onset position was larger than that of the backwards shift at the offset position. These results demonstrate that high-speed motion can induce shrinkage, even for a one-way motion path. This can be explained by the view that perceptual position is represented by the integration of the temporal average of instantaneous position and the motion representation.
authors.affiliation: Laboratory for Human Informatics, Graduate School of Information Systems, The University of Electro-Communications, Tokyo, Japan.
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Nakajima
authors.affiliation: Laboratory for Human Informatics, Graduate School of Information Systems, The University of Electro-Communications, Tokyo, Japan.
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Sakaguchi
mesh_terms: D000328:Adult; D006801:Humans; D008297:Male; D009039:Motion Perception / Q000502:physiology*; D033281:Nontherapeutic Human Experimentation; D010775:Photic Stimulation; D011601:Psychophysics / Q000295:instrumentation / Q000379:methods