Time dilation in a perceptually jittering dot pattern.
Although it is known that a moving stimulus appears to dilate in duration compared to a stationary stimulus, whether subjective motion devoid of stimulus motion is sufficient remains unknown. To elucidate this, we used a motion illusion in which an actually static stimulus clearly appears to move, a useful dissociation between actual and subjective motions. We used the jitter aftereffect resulting from adaptation to dynamic noise as such a tool and measured subjective durations of a static random-dot pattern in which illusory jitter was seen, an actually oscillating pattern mimicking the illusory jitter, and a static pattern without illusory jitter. Pattern oscillation as tiny as fixational eye movements robustly evoked time dilation, and time dilation to a similar extent was also induced by an actually static but subjectively jittering pattern. Taken together with the previous knowledge that this subjective jitter is related to a visually based compensation of spurious retinal image motions due to fixational eye movements, these findings demonstrate that visual duration computation is influenced by a representation at a high-level motion processing stage at which a stable visual world despite jittery retinal inputs has been established.
Department of Psychology, the University of Tokyo, Tokyo, Japan.
Shunsuke
S
Aoki
Department of Psychology, the University of Tokyo, Tokyo, Japan.
Akitoshi
A
Kawano
Department of Psychology, the University of Tokyo, Tokyo, JapanThe Research Institute for Time Studies, Yamaguchi University, Yamaguchi Japanterao@yamaguchi-u.ac.jp.
Masahiko
M
Terao
Department of Psychology, the University of Tokyo, Tokyo, Japanikuya@l.u-tokyo.ac.jphttp://www.l.u-tokyo.ac.jp/~ikuya/e/index.html.
Ikuya
I
Murakami
D000221:Adaptation, Ocular / Q000502:physiology; D004106:Dilatation; D005133:Eye Movements / Q000502:physiology*; D005260:Female; D005366:Figural Aftereffect / Q000502:physiology*; D005403:Fixation, Ocular / Q000502:physiology; D006801:Humans; D008297:Male; D009039:Motion Perception / Q000502:physiology*; D009903:Optical Illusions / Q000502:physiology*; D010364:Pattern Recognition, Visual / Q000502:physiology*; D011601:Psychophysics; D012160:Retina / Q000502:physiology; D013997:Time Factors; D055815:Young Adult