Percentage of reinforcement and reward magnitude effects in a T maze: Between and within subjects.

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Abstract
Rats were given 1 trial per day in a T maze where the alternatives were associated with differential reward magnitude (Wg) and/or percentage reinforcement (%). Equivalent experience with the alternatives was assured by interspersing forced among free trials throughout acquisition and extinction. The 6 groups of 16 Ss [subjects] each included: 12-12:50% (12 pellets were given upon each entry into the more favorable alternative [MFA] and 12 pellets were given on 50% of the entries into the less favorable alternative [LFA], 12-12, 1-1: 50%, 1-1, 12:50%-l, and 12-1. Evidence was obtained for: (a) the effect of reward magnitude and long inter trial interval on the ubiquitous character of the PRE (partial-reinforcement effect); (b) certain simultaneous contrast effects; (c) reversed, as contrasted with conventional, PRE in terms of choice behavior; and (d) within-S effects of % which were different from those obtained between Ss.

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