Reversal of the color-dependent Fraser-Wilcox illusion under a dark condition A Kitaoka1, K Yanaka2 |
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1Department of Psychology, Ritsumeikan university, Japan |
| Kitaoka and Ashida (2003, VISION, 15, 261-262) analyzed the Fraser-Wilcox illusion, a pattern-dependent motion illusion which is observed in a stationary image, and separated one elemental illusion from another, which rivaled each other in the original image. Kitaoka and Ashida proposed the “optimized” Fraser-Wilcox illusion, which has a much stronger effect than the original because of cooperation of the two elemental illusions. The optimized illusion depends on a particular luminance profile and its temporal change in appearance is loose or tonic. On the other hand, Kitaoka (2010, Introduction to Visual Illusion, Asakura-shoten, Tokyo) proposed a color-dependent version, which depends on a particular color profile and its temporal change in appearance is abrupt or phasic. Yanaka and Hilano (2011, Perception, 40 ECVP Supplement, 171) revealed that shaking the image enhances the color-dependent illusion. The present study demonstrates a reversal of the direction of motion in the color-dependent illusion when a printed image is weakly illuminated or is observed in the mesopic vision. No reversal occurs in the luminance-dependent one. We discuss the reversal suggesting the role of rods in modulation of perceived brightness and possible involvement of the luminance change-induced motion illusion (Anstis 1970, Vision Research, 10, 1411-1430). |
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