![]() Given the abovementioned sound delay of about 3ms per meter of distance from the visualized object, it is not obvious how audiovisual stimuli can so often be perceived as a unitary phenomenon. ![]() Nevertheless, in our daily life audiovisual stimuli are still perceived as synchronic at the source. However, there are significant differences in the propagation time for light and sound, as sound takes about 3 milliseconds (ms) to travel 1 meter (m) and light travels approximately 299 792 m in 1 ms. When a natural audiovisual event occurs, the visual and auditory signals are synchronic at the origin, since they are caused by the same physical source and thus emitted at the same time. ![]() These problems are related both to physical and neural differences underlying sound and light propagation and processing. To perceive synchrony in audiovisual events we face intricate problems because of the relative timing of visual and auditory inputs.
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