能動的自己回転運動に伴う視覚運動速度が身体制御に与える影響

抄録

We measured body movement during self-rotation about the yaw axis to investigate the effects of visual information on body control. In Experiment 1, subject rotated to the indicated angle, and we manipulated the relative velocity of optical flow which was the visual motion concomitant with the movement of subject. In the result, the response angles decreased as the relative velocity of optical flow increased. We assumed that the rotation velocity would decrease while the arrival time was constant. We hypothesized that as the optical flow velocity increased, the perception of self-rotation velocity increased and the subject would keep it constant unconsciously, resulting in that the physical rotational-velocity decreased and rotational angle also decreased. In Experiment 2, we found that the rotational velocity also decreased even though the subjects proactively ignored the visual motion. It suggests that the estimation of the velocity of the self-rotation was inevitably affected by visual information even if enough information from the vestibular system is available during self-rotation.