Food-deprived rats (n = 32) received 55 straight runway trials for 1 or 12 pellet rewards combined factorially with 0- or 20-sec. post-reinforcement delays. The 12-pellet groups were then run for an additional 55 trials at 1 pellet while the 1-pellet groups were run for 86 trials and then shifted to 12 pellets for an additional 24 trials. The result of importance was the absence of differences between delay and no-delay groups following reward reduction. These data were contrasted with effects of post-reinforcement delay on extinction.
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