Motion perception plays a role in the Anti-Gravity Lens illusion.

[Speaker] Yanagi, Junji:1
[Co-author] Ichikawa, Makoto:1
1:Chiba University (Japan)

When a certain SOA is introduced between the inducer and the target of "Gravity Lens illusion" (Naito & Cole, 1994), the direction of the illusory shift of the target can be reversed ("Anti-Gravity Lens illusion"). In this study, we examine how the directional relationship between the inducer and target affects the Anti-Gravity Lens illusion. The target was displayed at an eccentricity of 5 deg and the inducer was either on the nearer or farther side of it. It was found that the amount of the illusory shift of the target was greater in the centrifugal direction (the inducer was nearer than the target to the fixation point) than in the centripetal direction (the inducer was farther than the target). This directional anisotropy is consistent with the characteristic of motion perception which prefers centrifugal motion, suggesting the contribution of the motion processing system to the Anti-Gravity Lens illusion.
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