Contingent Delay versus Noncontingent Delay during Acquisition and Extinction
Three groups of rats were first trained with food and then extinguished in a runway. Running terminated either in no delay, bar pressing at FR16, or a delay equal to the time required for bar pressing. Terminal acquisition running speeds were ordered, from fastest to slowest, as the ordering of groups above. Extinction proceeded at about the same rate from each of the three terminal acquisition levels.