The effects of reward magnitude following nonreward and punishment

Four groups of 12 rats each received constant medium size rewards of nine 45 mg Noyes pellets prior to nonrewarded (N) and nonrewarded punishment (P) (0.25 rna shock of 0.1 sec duration) trials and either large (L) size rewards of sixteen 45 mg pellets· or small (S) size rewards of two 45 mg pellets following N and P trials in a runway. Following acquisition each of the four groups was randomly subdivided into either continuous N or continuous P extinction conditions. This resulted in a two X two X two completely randomized factorial design with the variables and its levels being L and S Post N reward magnitudes, Lands\u27 Post P reward magnitudes, and N and P extinction conditions. In acquisition, reward magnitude did not significantly affect performance. In extinction, large Post N reward magnitude produced larger resistance to extinction (Rn) than small Post N reward magnitude in the run and in the goal sections of the runway. The Post P reward magnitude did not affect performance in either acquisition or extinction. Higher Rn in the goal speed was reflected by the groups that received large Post N reward magnitude in the N extinction condition relative to the P extinction condition. The results of the present study were basically consistent with Capaldi\u27s sequential theory with regard to Post N reward magnitude but not to Post P reward magnitude