Abstract

Thirty-six water-deprived albino rats were trained to traverse an alley that terminated in a goalbox equipped with a liquid dipper. The Ss were assigned to one of four groups produced by the factorial combination of a number of dipper presentations as reward per trial (2 vs 10) and interval between rewards (4 vs 10 sec). Running speed was related negatively to both interreward interval and number of rewards per trial although the effect was not reliable in the latter case. These results are discussed in terms of a “two-process” interpretation of reinforcement in instrumental conditioning.

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