奥行き方向の運動知覚における重力方向の影響

抄録

In this study, we investigated the effects of gravity direction on the perception of motion in depth. We measured the magnitude of the acceleration of approaching and receding object that appeared to move with a constant velocity using the method of constant stimuli. To manipulate gravity direction from the vestibular and somatosensory systems, we used three conditions of observer's body orientation: upright, supine, and prone states. The results showed that the deceleration of the approaching motion was greater when observed with the prone and supine states than with the upright state. Moreover, the greatest acceleration of the receding motion for perceiving constant velocity was the prone state, followed in order by the upright state and the prone state. We discuss the effects of risk by the moving object and of gravity direction in normal environment on the perception of moving object.