title: Illusory motion produced by dichoptic stimuli during saccades.
abstract: A new motion illusion is reported in which saccadic eye movements can produce a perceived jump of a static stimulus presented dichoptically. In three experiments, observers made saccades while viewing a stationary stimulus consisting of a disk and random dots presented separately to the two eyes. In experiments 1 and 2, by measuring the strength of the perceived motion and the velocity of binocular eye movements, we found that (a) motion ratings were high for the stimulus that contained a large interocular difference in luminance, and (b) the saccadic strategy of the observer was virtually identical across different stimulus conditions. In experiment 3, by measuring the detectability of a short temporal gap introduced into the stimulus around saccades, we found that saccadic suppression was normal in the dichoptic presentation. We discuss possible mechanisms underlying the illusory motion.
authors.affiliation: Department of Human Sciences, Faculty of Human-Environment Studies, Kyushu University, 6-19-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan. mitsudo@psycho.hes.kyushu-u.ac.jp
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Mitsudo
authors.forename: Sachio
authors.initials: S
authors.lastname: Nakamizo
mesh_terms: D006801:Humans; D007088:Illusions; D009039:Motion Perception / Q000502:physiology*; D010364:Pattern Recognition, Visual / Q000502:physiology*; D010775:Photic Stimulation; D012016:Reference Values; D012438:Saccades / Q000502:physiology*