22 巻 (2017) 3 号 p. 391-394
We examined whether the visually induced self-motion perception (vection) was influenced by body posture. The participants observed optic flow through head mounted display and judged the subjective strength of vection by using a 101-point rating scale. Experiment 1 showed that vection was weaker when face was moved upward than when face was to the front. However, there were no effect of torso position (seating, standing, and supine) and no interaction between torso and head positions. In Experiment 2, the result showed that vection was weaker the inverted torso-and-head position than the normal torso-and-head position. We suggest that vection is weaker a less experienced body posture than a habitually experienced body posture in daily life.