Pigeon-Neck Illusion

Jun Ono, Akiyasu Tomoeda, and Kokichi Sugihara
Meiji University, JST, CREST, Japan

In this illusion a rectangle moving at a constant speed in front of stripes generates apparent reverse motion. This apparent motion is similar to the action of a neck when the pigeon walks.
Well-known kickback illusion also appears to move reversely in a moment. For the case of the kickback illusion, the width of stripes is thin. However, for the case of the pigeon-neck illusion, the width of stripes is thicker. Thus the conditions between them are different, and so the pigeon-neck illusion is new.

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