Factors facilitating lever-press avoidance.

Abstract
To assess factors which hinder discriminated lever-press avoidance, rats which had learned to respond to a CS [conditional stimulus] by crossing the experimental chamber to press a lever in order to avoid shock were retained during the intertrial interval in the experimental chamber or In a carrying case. Locus of intertrial placement enhanced performance more than required chamber crossing. All experimental groups performed better Ss[subjects] retained in lever chamber without door drop as part of CS. A 2nd experiment demonstrated that superiority of experimental groups in Experiment 1 was due inpart to effectiveness of a door-drop CS. Experiment 3 showed that training under optimal conditions of Experiment 1 did not transfer to control conditions and vice versa.

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