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In a stream/bounce display in which two identical visual objects move toward each other, coincide (completely overlap), and then move apart, the objects can be perceived as either streaming through or bouncing off each other. Despite the perceptual ambiguity in this display, the streaming percept is dominant. However, a sound burst presented at the time that the objects coincide facilitates the bouncing percept. Herein, we report a perceptual phenomenon in which the overlap between objects is illusorily perceived as a non-overlap in the stream/bounce display accompanied with sound. In the experiment, the amount of overlap between two objects was systematically manipulated in the presence/absence of a sound. Observers were asked to judge whether the two objects overlapped with each other and then asked whether the objects appeared to stream through or bounce off each other. The results were consistent with those of previous studies showing that sound promoted the bouncing percept. Most importantly, the sound presentation facilitated the perception of a non-overlap between the objects instead of a physical overlap, suggesting that the momentary overlap was inadequately perceived. We discuss the possibility that an abrupt sound temporally interrupts visual processing such as the formation of dynamic object representations

Perceived Non-Overlap of Objects in an Audiovisual Stream/Bounce Display