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Visual discrimination performance in rats following nucleus posterior thalami and di-mesencephalic juncture damage.

Following training on both a size discrimination and a pattern discrimination problem, adult albino rats were given either 1-stage or 2-stage nucleus posterior lesions, 1-stage lesions to the di-mesencephalie juncture, or no lesions. Postoperative testing revealed that (a) brain-damaged jSs performed more poorly than normal controls in relearning the two visual habits, (b) 2-stage nucleus posterior lesioned Ss were not significantly different from 1-stage nucleus posterior lesioned animals, and (c) brain-damaged Ss did not differ significantly from normals with respect to performance on a size thres­ hold task. This pattern of results suggests that neither diaschitic effects nor loss of visual acuity can adequately account for visual discrimination retention deficits induced by nucleus posterior lesions. The data also provide further evidence for the existence of a pathway through the di-mesencephalic juncture which is functionally significant in visual discrimination performance.