Effect of Illusion Figure’s Oscillation on Fraser-Wilcox Illusion

抄録

Fraser-Wilcox illusion is attractive for art and design. Understanding how the parameters (e.g., color, form, and size) affect the illusion is crucial to its applications. However, the effects of the parameters on the illusion have yet to reveal sufficiently for systematically understanding them. The reason for the difficulty of systematically revealing the parameters’ effects is the instability and weakness of the illusion. Some previous studies report that the oscillation of the illusion figure enhances the illusion although the details are no clear. In this study, we evaluate whether we can systematically examine the illusion by enhancing it with the illusion figure’s oscillation. For this evaluation, we conduct the experiment where the observers subjectively evaluate the illusion’s magnitude of the oscillating illusion figure. In the experiment, the oscillating vertical gratings based on the color-dependent Fraser-Wilcox illusion are generated with a mobile workstation. There are the conditions of the oscillation’s direction, amplitude, and frequency. A 4-point scale is used for the subjective evaluation of the illusion. Three observers participate in the experiment. The results obtained from the experiment indicate that the oscillation enhances the illusion. They also indicate the oscillation’s effect depends on the oscillation’s direction, amplitude and frequency, and depends on the grating’s direction. These findings support the possibility of systematically examining the illusion by enhancing it with the illusion figure’s oscillation.