Abstract
Five goldfish were trained to strike a key illuminated with 550 mμ to obtain food on a VI 30 min. schedule. After 30 days of single-stimulus training the Ss were divided into two groups: one group remained on single-stimulus training while the other group was given discrimination training. The discrimination training consisted of S+ (550 mμ trials randomly alternated with S− (590 mμ) trials which were not reinforced. After 15 days of training the Ss were tested for generalization in extinction using 9 different wavelengths. The Ss were then retrained so that each S who previously had single-stimulus training now received discrimination training and vice versa. After 17 days of retraining the Ss were retested for generalization. Behavioral contrast and peak-shifts were found with the goldfish. In addition, the effects of both discrimination training and the obtained stimulus generalization gradients appeared to be reversible with the goldfish.
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