Abstract

We examined whether vection was determined by the retinal coordinate. The participants sat on a chair with their body rotated 0, 45, 90 and 135 degrees and with their head facing directly at the stimulus screen. Vection strength was changed by rotation of the body. Thus vection was affected by the body coordinate and it was not determined by the retinal coordinate alone.

Highlights

  • When stationary observers are exposed to a large-field visual motion, simulating the retinal flow generated by self-translation or self-rotation, they often experience an illusory perception of self-motion, known as vection (Fischer & Kornmuller, 1930)

  • Kano (1991) reported that vection is affected both by retinal and world coordinates. These results suggest that vection is affected by the retinal coordinate

  • If the vection is determined by the retinal coordinate, the vection strength would be constant for each of the different body postures

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Summary

Introduction

When stationary observers are exposed to a large-field visual motion, simulating the retinal flow generated by self-translation or self-rotation, they often experience an illusory perception of self-motion, known as vection (Fischer & Kornmuller, 1930). Lepecq et al (2006) reported that by adding a vestibular input during vection, the vection direction could be biased intentionally. These results implied that vection was not determined by the retinal coordinate alone. Nakamura & Shimojo (1998) reported that the vertical vection was modulated by the body posture whereas the horizontal vection was not modulated by the posture. This result implied that vection is mediated by both retinal and body coordinates. If the vection is determined by the retinal coordinate, the vection strength would be constant for each of the different body postures

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