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Lihan Chen, Huihui Zhang, Xiaolin Zhou; Adaptation to temporal interval modulates the perception of visual apparent motion. Journal of Vision 2012;12(9):1029. doi: 10.1167/12.9.1029.
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In current study, we asked whether and how adaptation to the time interval between two sound beeps would influence the perception of the subsequent visual apparent motion. We presented participant with two successive stimulus frames of a visual Ternus display (Petersik & Rice, 2006; Ternus, 1926), in which each frame had two discs, with the second disc of the first frame and the first disc of the second frame being presented at the same location. Depending on the inter-stimulus interval (ISI) between the two frames, participants could perceive either "element motion" (short ISI) or "group motion"(long ISI). In Experiment 1, participants adapted to either "element motion" (ISI=50 ms) or "group motion"(ISI=200 ms). In Experiment 2, participants adapted to a time interval of 50 or 200 ms through observing two disks flashing at the center of the screen. In Experiment 3, participants adapted to a time interval of 50 or 200 ms through hearing a sequence of two paired sound beeps. After adaptation in each trial, participants were presented with a Ternus probe in which the ISI between the two frames was equal to the transitional threshold of perceiving "element motion" or "group motion", as determined by a pretest. Results showed that adaptation to the short interval (50 ms) led to more reports of "group motion" for the subsequent Ternus probe. However, no obvious adaptation aftereffect was observed for the long interval (200 ms), except that adaption to the auditory interval gave rise to more "group motion" reports. Overall, these findings suggest that adaptation to a (short) time interval conveyed cross-modally may lead to more expanded perception of the time interval between two visual frames in Ternus display; it is possible that a common neural mechanism underlies the adaptation to the timing of intra- and cross-modal events.
Meeting abstract presented at VSS 2012
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