Abstract
The current study examined the effects of electrolytic median raphe lesions on the performance of several T-maze discrimination tasks. Raphe lesions were found to impair the reversal, but not the acquisition, of a learned position habit, but to be without effect on either the acquisition or reversal of simultaneous brightness discrimination task. Rats with raphe damage were severely impaired in the acquisition of either a successive brightness discrimination task or of a delayed spatial alternation task. These results are similar to those which have been reported after limbic damage, and support the view that the paramedian midbrain tegmentum may play an important role in the functioning of limbic structures.
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