1-B-19 歩く人・走る人の背景に知覚される仮現運動(2002年度 日本基礎心理学会第21回大会優秀発表賞)

抄録

We have found a novel visual illusion where an ambiguous motion became unidirectional with the superimposition of an image of a human figure walking on a treadmill. When we presented a counterphase grating as an ambiguous backdrop, the grating appeared to drift in the opposite direction to the bipedal locomotion. This phenomenon indicates that the visual system would evaluate low-level motion signals relative to a high-level representation of an object's movement defined by its biological motion. In this study we presented images of human figures either walking forward or walking backward in order to examine the effects of a directional correspondence between human movement and form that was important for the recognition of biological motion. The results revealed that a forward walker produced the illusion more reliably than a backward walker, and confirmed that recognition of locomotion is a primary determinant for the illusion.