Choice between magnitude and percentage or reinforcement.

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Abstract
A 3 x 3 x 2 factorial design (180 Ss) was employed with rats in a T maze in order to test: (a) certain interpretations of the partial-reinforcement extinction effect (PRE); (b) contrast effects of differential magnitude and percentage reinforcement; and (c) reward as a cue in reversal learning. During acquisition (100 trials) all Ss received 4 pellets upon each entry into the more favorable alternative and either 1, 2, or 4 pellets on either 26, 50, or 100% of their experiences with the less favorable alternative. Half the Ss were then given extinction and half reversal (27 trials). Equivalent experience with either alternative was maintained throughout. It was concluded that: (a) the obtained PRE could be more adequately interpreted in terms of frustration-based concepts than by cognitive-dissonance theory; (b, c) no evidence was found for either contrast effects or cue value of reward.

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