Abstract
Four groups of rats were trained on a random-interval schedule of positive reinforcement. During daily sessions successive 2-min exposures to the schedule were interrupted by 2-min time-outs during which the lever operandum was withdrawn from the chamber. Response-independent shock was superimposed in different portions of the behavior stream for differ en t groups so that one group was shocked in the middle of the reinforced periods, one at the end of the reinforced components, one group in the middle, and one group at the end of the time-out components. Animals shocked during or at the end of the reinforced component were suppressed by lower intensity shocks than were rats shocked outside the periods of bar-pressing. The results are consistent with several different conceptual schemes.
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