We investigated the effects of auditory stimuli on the perceived velocity of a moving visual stimulus. In Experiment 1, a moving comparison stimulus (4.2~5.8 deg/s) was presented together with filled (or unfilled) white-noise bursts or with no sound. The standard stimulus was a moving visual stimulus (5 deg/s) presented before or after the comparison stimulus. The participants had to judge which stimulus was moving faster. The results showed that the perceived velocity in the auditory-filled condition was lower than that in the auditory-unfilled and no-sound conditions. In Experiment 2, we investigated the effects of auditory stimuli on velocity adaptation. The results showed that the effects of velocity adaptation in the auditory-filled condition were weaker than those in the no-sound condition. These results indicate that auditory stimuli tend to decrease the perceived velocity of a moving visual stimulus. （本研究では、運動視覚刺激の知覚速度に対する聴覚刺激の影響を検討した。その結果、持続したホワイトノイズをともなった運動刺激の知覚速度は、断続したホワイトノイズおよび無音条件の速度よりも遅いことを示した。また、持続したホワイトノイズをともなう場合、速度順応の効果は無音よりも弱くなることを示した。これらの結果は、聴覚刺激が運動する視覚刺激の知覚速度を低下させる傾向があることを示している。）
Michiaki Shibata, Jiro Gyoba.
