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Type of Motion in Inverted Self-Motion Perception Induced by a Foreground Stimulus

Slowly moving foreground induces an illusory self-motion perception in the same direction as its motion direction (inverted vection). In this study, the effects of motion type of the foreground stimulus on inverted vection were investigated using a sample of 3 men and 1 woman. As indices of perceived strength of the inverted vection, duration and estimated magnitude were measured. Analysis of the psychophysical experiment indicated that a translating foreground induced inverted linear vection in the same direction as the stimulus motion. However, a rotating foreground did not induce an inverted roll vection. Statistical analyses indicate that there is a significant difference between two foreground motion conditions (Duration: t3 = 14.54, p < .01; Estimation: t3 = 16.92, p < .01). This result supports the hypothesis that eye-movement information is responsible for the occurrence of inverted vection.