Abstract
In Experiment 1, for animals trained in the morning, Kamin effects (U-shaped retention functions) were obtained for groups receiving active avoidance training (AA) or noncontingent shocks in the avoidance apparatus (PNC), but not for animals receiving noncontingent shocks in a separate apparatus (TNC). For animals trained in the afternoon, the retention functions observed were monotonic in all cases (i.e., no Kamin effects were obtained). Experiment 2 compared groups that received avoidance training and retention testing in the same apparatus with groups that were trained and tested in a different apparatus. A Kamin effect was observed for the former groups but not for the latter.
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