Laboratoire Psychologie de la Perception Institut Neurosciences Cognition Université Paris Descartes Centre National de Recherche Scientifique
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Time in Perspective

Perceptions of time and space are object to strong contextual effects. Like in physics, they appear to be bound together. The perceived spatial-extent of a constant retinal-extent increases with its perceived distance from the observer. The perceived duration (PercDur) of a moving object increases with its covered angular trajectory. It follows that the PercDur of moving objects covering identical angular trajectories should also increase with distance. Using 3D-rendered balls rolling for 600-900-1200ms and covering 5.5-11-22deg trajectories in fronto-parallel planes of a linear-perspective scene, we show that PercDur dilates by up to 50% as the fronto-parallel plane of the rolling-ball recedes from the observer. Such time-dilation is mostly contributed to by the smaller size of the distant ball. As in a 3D-world objects’ sizes and their covered trajectories per time-unit decrease with distance, and as the two factors lead to opposite PercDur-effects, the results suggest a form of time constancy in a 3D-world.



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