Abstract
In the first experiment, rats given a 5-min period of preexposure (simple exploration) to a two-compartment box showed poorer passive avoidance of the compartment where they were subsequently shocked than a control group which was not preexposed to the apparatus. The second experiment involved preexposure to sugared milk (SM), flashing light and loud noise (LN), or simply the apparatus (EC). One group received no exposure to the apparatus (NC). Following one shock trial, the groups were ordered LN > NC > EC > SM from most to least passive avoidance. The results were discussed in the context of latent inhibition and an averaging model of positive and negative events.
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