Abstract
Three squirrel monkeys were trained to perform a sequential matching problem by use of a fading technique. One of three differently colored standard stimuli was presented on the left key when S responded on that key. A response on the right key then resulted in presentation of a comparison stimulus on the right. Each additional response on the right key changed the color of the comparison stimulus. When the standard and comparison stimuli matched, a response on the left key was reinforced; a response on the left key when the colors did not match resulted in a time out. Exp. 2 showed that all three Ss could learn to match standard and comparison stimuli of different colors (e.g., a red standard and blue comparison stimulus.) The colors of the standard stimuli in this experiment were all different from any of the comparison colors.
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