3 groups of 4 rats completed run-to-lick contingencies with delay of reward intervals of 0, 3, and 10 sec. imposed between the FR 10 running requirement and delivery of a 4% sucrose solution. Following acquisition sessions, Ss received extinction sessions which continued until instrumental responding stabilized. The experimental design continued over 4 replications. There were no differential effects of delay of reward conditions on either total acquisition or extinction responding.
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