Using a Transparent Motion Display in Which Two Dot Patterns

Using a transparent motion display in which two dot patterns moved in opposite directions, Lankheet and Verstraten found that:

A) Attention to one direction produced subsequent motion aftereffects in the other direction
B) Attention to one direction produced subsequent motion aftereffects in the same direction
C) Attention to one direction raised contrast thresholds for faint patterns moving in that direction
D) Had no effect on subsequent motion perception

Correct Answer:

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