Auditory gap transfer modulates perception of visual apparent motion L Chen |
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Peking University, China
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| Auditory gap transfer illusion refers to that when a long glide with a temporal gap in the middle crossed with a shorter, continuous glide at the temporal midpoint, the gap is perceived in the shorter pitch trajectory [Nakajima et al.2000, Perception & Psychophysics, 62,1413-1425]. Here auditory gap transfer paradigm was employed to investigate how perception of visual apparent motion is modulated with two competing glides. Ternus display was used. The Ternus display involves a multielement stimulus that can induce either ‘element motion’ or ‘group motion', dependent on the inter-stimulus-interval between two visual frames. In Experiment 1, Ternus display was embedded in a temporal gap (100 ms) of either a long glide or a short glide. The longer glide biased the perception of visual Ternus to be more reports of "group motion" than the short glide did. In Experiment 2, a shorter continuous glide crossed the middle of a long glide with a temporal gap. The gap was perceived in the shorter glide and the percentage of reporting "group motion" was decreased as in Experiment 1. The results indicated that with competing auditory events, the salient temporal grouping of auditory events precedes and dominates in affecting perception of visual apparent motion. |
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