Abstract
Development and extinction of a complex visual discrimination were investigated in human subjects, using 3 fixed-ratio schedules of reinforcement and 3 different stimulus intervals. Both a continuous response measure and a verbalized response were studied. The degree of discrimination was found to be inversely related to the ratio used in conditioning and directly related to the length of the stimulus interval. Resistance to extinction was greater when higher ratios had been used. The likelihood of correct verbalization was directly related to the extent to which discrimination had advanced in conditioning, but was not essential for a high resistance to extinction.
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