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Updated: Jun 22, 2026

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
Published on: April 16, 2014
Illusory position shift induced by cyclopean motion
Ikuya Murakami1, Yasuhiro Kashiwabara
1Department of Life Sciences, University of Tokyo, Tokyo, Japan. ikuya@fechner.c.u-tokyo.ac.jp
Abstract:
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.
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