Abstract
10 rats with bilateral dorsal hippocampal lesions and 16 control rats were pretrained in an unbaited T maze and then trained on a position habit reinforced by the opportunity for exploration. In comparison with the control Ss the hippocampal lesioned rats during pretraining perseverated more, made more maze-unit entries after some exposure, ran more slowly initially, and were less distracted by environmental change. During choice training the hippocampal lesioned rats perseverated more than control Ss and ran faster over days on forced trials. The results are consistent with a response inhibition interpretation of hippocampal function and emphasize the importance of pretraining and changes over time in interpreting the effects of hippocampal lesions.
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