Abstract
Rats were trained on a fixed-interval schedule where each interval had an equal probability of being terminated by reinforcement or by an auditory stimulus. In testing, the concentration of the milk reinforcer and the intensity of the sound were varied. The durations of both the postreinforcement and the poststimulus pauses were found to be increasing functions of reinforcer magnitude and stimulus intensity, respectively. It is suggested that the effect of changes in the reinforcer magnitude upon the duration of the postreinforcement pause reflects the enhancement or impairment of the discriminative function of the reinforcer in the same way that the discriminative function of any stimulus may be affected by changes in its intensity.
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