Spatio-temporal conditions for apparent movement

A number of psychophysical studies on apparent translatory movement, apparent rotational movement, and compositions of these transformations are reviewed. The studies have yielded modern equivalents and extensions of Korte's third law. The results support the hypotheses that (a) apparent movements over short and long distances are processed by separate mechanisms and (b) apparent movement over a long distance is represented by impleting ("filling in") a path connecting the discrete stimulus presentations. It is suggested that impletion serves economy of processing by normalizing the internal representation of an object viewed in apparent movement to the format used for objects viewed in real movement.

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