title: Perceptual organization of moving stimuli modulates the flash-lag effect.
abstract: When a visual stimulus is flashed at a given location the moment a second moving stimulus arrives at the same location, observers report the flashed stimulus as spatially lagging behind the moving stimulus (the flash-lag effect). The authors investigated whether the global configuration (perceptual organization) of the moving stimulus influences the magnitude of the flash-lag effect. The results indicate that a flash presented near the leading portion of a moving stimulus lags significantly more than a flash presented near the trailing portion. This result also holds for objects consisting of several elements that group to form a unitary percept of an object in motion. The present study demonstrates a novel interaction between the global configuration of moving objects and the representation of their spatial position and may provide a new and useful tool for the study of perceptual organization.
authors.affiliation: Vanderbilt U, Vanderbilt Vision Research Ctr, Dept of Psychology.
authors.forename: Katsumi
authors.initials: K
authors.lastname: Watanabe
authors.forename: Romi
authors.initials: R
authors.lastname: Nijhawan
authors.forename: Beena
authors.initials: B
authors.lastname: Khurana
authors.forename: Shinsuke
authors.initials: S
authors.lastname: Shimojo
mesh_terms: D005403:Fixation, Ocular / Q000502:physiology; D006801:Humans; D009039:Motion Perception / Q000502:physiology*; D011930:Reaction Time; D014796:Visual Perception / Q000502:physiology