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Abstract
Rats with posteromedial thalamic lesions were impaired in learning position reversal problems in a T maze. Test trials given after learning each reversal problem disclosed defective retention in the posteromedial thalamic group. Neither bilateral amygdaloid lesions nor unilateral neocortical ablations had any remarkable effects on learning or retention of this spatial task. Analyses of lesion placements suggest that damage to the parafascicular region is critical for the appearance of these learning and retention defects. It is proposed that the parafascicular region contributes to consolidation of spatial memory traces.
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