title: The Ouchi illusion: an anomaly in the perception of rigid motion for limited spatial frequencies and angles.
abstract: The spatial parameters underlying a novel illusion of relative motion are characterized. A simple stimulus composed of two sine-wave gratings was sufficient to generate the illusion. We measured the response of subjects to rapid, small-amplitude oscillations of this stimulus behind a fixation point. The effect was clearly strongest for acute angles between the gratings, but only when spatial frequency was between 6 and 11 cpd. We surmise that activity in the grating cells of the primate visual cortex (von der Heydt, Peterhans, & Dursteler, 1992) might be the cause of the illusion. The illusion is potentially an important tool in understanding how higher cortical areas combine disparate motion signals.
authors.affiliation: Australian National University, Canberra, Australia. t.hine@hbs.gu.edu.au
authors.forename: T
authors.initials: T
authors.lastname: Hine
authors.forename: M
authors.initials: M
authors.lastname: Cook
authors.forename: G T
authors.initials: GT
authors.lastname: Rogers
mesh_terms: D006801:Humans; D009039:Motion Perception; D009903:Optical Illusions; D014793:Visual Cortex / Q000502:physiology