Two parts (faces) of a reversible figure were differentially reinforced by giving S money whenever he was shown one of the faces and taking money from him whenever he was shown the other face. After these reinforcement trials, the 24 Ss were able to locate the face previously associated with reward reliably more rapidly than the other face. The results were interpreted as indicating that changes in figure perception may be influenced by past histories of reward and punishment associated with the figures.
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