4 stumptail monkeys and 4 albino rats were trained in a discrete-trials latency-correlated reinforcement (DRL) situation. Phenomena investigated were: (a) acquisition of temporal discriminations, (b) effects of within-S intertrial interval variations, (c) disinhibition of responses by novel extraneous stimuli, (d) effects of reinforcement magnitude, and (e) differential conditioning based upon reinforcement of short vs long latencies. Detailed quantitative descriptions of these phenomena were obtained by automated procedures permitting direct species comparisons.
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