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Measured changes in the mental representation of a visually presented pattern induced by a prior sequence of static displays. In Exp I, 16 undergraduates were shown a static rectangle at 3 orientations along a possible path of rotation with each orientation being separated temporally and having an interstimulus interval (ISI) of 250 msec. Ss were instructed to remember the 3rd orientation in the sequence and were then presented with a rectangle at a 4th orientation that was either the same as, or different from, the 3rd. There were 2 ways the orientation could be different: It could be a small rotation in the same direction as the implicit motion, or an equally small rotation in the opposite direction. Ss found it harder to detect differences in the direction of implicit motion, suggesting that their memory for the 3rd orientation had been distorted along that direction. In Exp II (10 undergraduates), it was found that this effect …