2007 年 25 巻 2 号 p. 212-220
Seven experiments investigating the distortion in time perception during seeing motion patterns are reviewed. The first and second experiments showed the fundamental results in which duration estimates increase with motion velocity but duration estimates in the stationary condition are greater than those of the slowest velocity condition. The former is called as the velocity effect on time perception. The next experiment showed that the velocity effect remains even if observers focus on the other stimulus superimposed with motion pattern. Other experiments showed that the velocity effect can be the temporal-frequency effect and occur in the portion of stimulus onset and offset and that the temporal-frequency effect is also observed in the auditory modality. The last two experiments examined a relationship between the velocity effect and the asynchronous phenomenon of color and motion and showed that different processes are involved in these effect and phenomenon. These results indicate that multiple processes intricately concern the distortion in time perception.