Abstract
Rats were pretrained in the presence of an auditory click rate stimulus of 14 pps correlated with variable-interval or variable-ratio reinforcement. During subsequent discrimination training, the added stimulus, correlated with extinction, was 18, 36, 72, or 0 (no sound) pps. After discrimination, Ss were given a generalization test session, in extinction, in which five click rate stimuli were presented. The inverse relationship between physical separation of the discrimination training stimuli and amount of peak shift of the generalization gradient occurred regardless of the original positive reinforcement schedule during training. Behavioral contrast was not produced by all Ss. Results demonstrated no effect of separation of training stimuli on behavioral contrast and that behavioral contrast and peak shift need not covary.
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