2017 年 22 巻 1 号 p. 113-123
Using ambiguous motion stimulus, it has been reported that motion perception is affected by voluntary action. In this study, we investigated the effect of action on speed perception of motion. In Experiment 1, we measured the perceived speed of the moving object, which linked with participants' hand movement in the timing, motion direction and speed, and found that the faster the participant moved the hand, the faster the perceived speed was. In Experiment 2, we measured the perceived speed of the object linked to hand movement in the timing and motion direction, not speed. In this case, perceived speed was independent of hand speed when the object had the same speed with the hand. Therefore, the results suggest that speed perception as a consequence of action changed by the intention for object speed in the hand movement.