title: Motion assimilation for expansion/contraction and rotation and its spatial properties.
abstract: In a two-frame apparent motion display, a test grating was displaced horizontally or vertically in the presence of an inducer of which component gratings made up expanding/contracting or rotational motion as a whole. In the first experiment, we demonstrated that motion assimilation did occur for the test accompanied by the two-dimensional motion of the inducer. In the second experiment, we showed that the spatial limit of motion assimilation for expansion/contraction or rotation was large, extending over at least a visual angle of 14-21 deg in diameter, but spatial summation did not occur within the limit. The results were discussed in terms of the interaction between local motion detectors and higher-order detectors which monitor global motion of the whole stimulus pattern.
authors.affiliation: Laboratory of Psychology, Faculty of Engineering and Design, Kyoto Institute of Technology, Japan. ohtani@hiei.kit.ac.jp
authors.forename: Y
authors.initials: Y
authors.lastname: Ohtani
authors.forename: M
authors.initials: M
authors.lastname: Tanigawa
authors.forename: Y
authors.initials: Y
authors.lastname: Ejima
mesh_terms: D006801:Humans; D009039:Motion Perception / Q000502:physiology*; D009903:Optical Illusions / Q000502:physiology; D010364:Pattern Recognition, Visual / Q000502:physiology*; D011601:Psychophysics; D012399:Rotation