Abstract

Four groups of five rats each were given the opportunity to acquire lever pressing without direct experimenter assistance. Subjects in Groups 1 and 2 were first given prior magazine training with the levers retracted and the next day were presented with one or two levers, respectively. Each lever press produced a food pellet. Subjects in Groups 3 and 4 were exposed directly to one or two levers, respectively, without prior magazine training. Three of five rats in Groups 1, 3 and 4 and all rats in Group 2 acquired lever pressing within a single hour session.

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