Abstract
An onset to onset rule predicts the direction and the magnitude of the displacement in depth that accompanies the successive and equal exposures of a moving object to the two eyes. This rule is ambiguous with respect to identifying the points or regions that are actually “fused”; the disparities of onsets, offsets, and average visual directions are all equal and therefore predict the same illusory displacement. Unequal exposures were used in the present experiment to determine which points or regions do define this disparity. The results revealed that neither onset locations nor offset locations predict the illusion; rather, the fusion of the entire exposed traverses (or their average visual directions) determines the displacement. Because this displacement seems exclusively determined by spatial characteristics, the similarity of this illusion to the Pulfrich effect was questioned.
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