Illusory position shift induced by cyclopean motion.
The position of a visual pattern moving within a static aperture appears to be displaced in the direction of motion. This illusory position shift can be induced by luminance-defined as well as contrast-defined motion. The present study used a random-dot binocular correlogram in which a moving square-wave grating was solely defined by binocular correlations. This cyclopean motion was found to induce illusory position shift. Consistent with previous reports on position shift induced by second-order motion, the illusion was smaller than that found in the case of the first-order motion. This pattern of results unequivocally demonstrates the existence of a binocular mechanism mediating this illusion.
Murakami
Ikuya
I
Department of Life Sciences, University of Tokyo, Tokyo, Japan. ikuya@fechner.c.u-tokyo.ac.jp
Kashiwabara
Yasuhiro
Y
D000293:Adolescent; D000328:Adult; D015350:Contrast Sensitivity / Q000502:physiology*; D005260:Female; D006801:Humans; D008029:Lighting; D008297:Male; D009039:Motion Perception / Q000502:physiology*; D009903:Optical Illusions; D010775:Photic Stimulation / Q000379:methods; D011594:Psychometrics; D011601:Psychophysics; D015357:Vision Disparity / Q000502:physiology*; D015348:Vision, Binocular / Q000502:physiology; D055815:Young Adult