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Oral
OR25-24-1

Vection strength is determined by the subjective size of a visual stimulus modulated by amodal completion

[Speaker] Ogawa, Masaki:1
[Co-author] Seno, Takeharu:1, Ito, Hiroyuki:1, Okajima, Katsunori:2
1:Kyushu University (Japan), 2:Yokohama National University (Japan)

It has been reported that vection (illusory self-motion perception induced by a visual stimulus) strength is determined by the retinal size of a visual stimulus. We newly report that even though the retinal stimulus size was constant, vection strength could be varied, depending on the subjective stimulus size determined by amodal completion.
In Experiment 1, we presented a background motion stimulus that was seen through peeping windows on the foreground plane. Even though the physical (retinal) size of the windows were small, when the participants subjectively perceived the motion stimulus size as larger than the physical window size by amodal completion, they perceived enough strong vection. In further experiments, we showed that the perceived vection strength was correlated to the strength of amodal completion.
Vection strength is not determined by the physical (retinal) stimulus size but by the subjective stimulus size.
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