Abstract
Seven hooded rats with electrolytic lesions centered in the dorsal medial nucleus of the thalamus and nine sham-operated animals were given a postoperative reacquisition-retention test of a preoperatively acquired compound stimulus, visual-tactile, discrimination problem. Also, 10 rats with the same lesion and eight animals with sham operations were tested for postoperative acquisition of the same discrimination problem. The animals with thalamic lesions were found to be deficient relative to the sham-operated animals on both retention and acquisition of the discrimination task. Tests for maze activity, food consumption, and visual placing response failed to produce any evidence for differences between the thalamically damaged and sham-operated animals.
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