Generalization of conditioned suppression.

Abstract
Ten young (5 1/2 mo) and 10 old (9 mo) rats trained to lever press for food on a VI schedule were trained to suppress to a tone of either 3500 cps or 670 cps. Generalization of the CER was measured in the presence of tones lower than 3500 cps or higher than 670 cps. The results indicated that the CER will generalize along an auditory continuum without prior discrimination training: amount of suppression was inversely related to frequency difference between CS and test stimulus. Older rats showed flatter gradients than younger rats, after both groups had been trained to suppress to a 3500-cps. tone, but the groups did not differ following training with a 670-cps. tone.

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