Change, not motion, determines subjective duration

[Speaker] Tomimatsu, Erika:1
[Co-author] Nakajima, Yoshitaka:1, Elliott, Mark A:1,2, Ito, Hiroyuki:1
1:Kyushu University (Japan), 2:National University of Ireland, Galway (Ireland)

When we compare the duration of a stimulus in which patterns of random dots successively change (dynamic duration) with the duration of stimulus in which the pattern does not change (static duration), the former is perceived to be longer than the latter. We inserted some blanks into the dynamic and the static durations in order to examine the influence of presentation frequency and the introduction of random-dot-pattern changes. Random dots that appeared for 17 ms followed by a 17- or 50-ms blank were repeatedly presented during stimuli presented in the range 217 to 1283 ms. Random-dot patterns, presented during the stimulus were either all the same or different from each other. In the present results, both higher presentation frequency and the introduction of pattern (i.e. spatial) changes lengthened subjective duration. The subjective duration seemed prolonged as a function of temporal or spatial changes in the stimulus.
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