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Rats with cytotoxic ventral hippocampal lesions which removed approximately 50% of the hippocampus (including dentate gyrus) starting from the temporal pole, displayed a reduction in freezing behaviour following the delivery of an unsignalled footshock in an operant chamber. This was more plausibly a result of reduced susceptibility to fear than a result of a lesion-induced increase in general motor...
Electrolytic lesions of the dorsal hippocampus (DH) produce deficits in both the acquisition and expression of conditional fear to contextual stimuli in rats. To assess whether damage to DH neurons is responsible for these deficits, we performed three experiments to examine the effects of neurotoxic N-methyl-d-aspartate (NMDA) lesions of the DH on the acquisition and expression of fear conditioning...
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