Abstract
Different effects of hippocampal lesions in rats and monkeys that were reported in earlier studies of distractibility were examined in partial replications, with the goal of evaluating a possible species difference in hippocampal function. Both the reduced distractibility previously seen after hippocampal lesions in rats and the retarded habituation previously seen after hippocampal lesions in monkeys were reproduced in the rat by varying the testing conditions, pointing to a single underlying disorder rather than to species differences in the effects of hippocampal lesions. The results of the present experiments were interpreted as evidence that alterations in response to a distractor after hippocampal lesions are determined by an interaction between underlying effects of hippocampal lesions and the degree of novelty of a distracting stimulus.
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