Abstract
Rats with hippocampal damage were compared to cortically lesioned and normal controls in the acquisition of a shuttlebox avoidance task. It was hypothesized that animals with lesions of the hippocampus are superior to controls at this task because they are more fearful. Before avoidance training, all animals were allowed to lick at a drinking tube containing a highly palatable solution of glucose and saccharin. Following avoidance training, animals were returned to the drinking situation and the shuttlebox CS presented while the rat licked. The extent to which the CS suppressed licking provided an estimate of the fear transferred from the avoidance situation. According to this measure, animals with lesions of the hippocampus were more fearful than control animals. This result was interpreted in terms of heightened ACTH levels seen following damage to the hippocampus.
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