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.