Effects of removal of the anterior or posterior portions of the neocortex on learning and retention of a visual habit

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Effects of removal of the rostral or occipital portions of the neocortex on acquisition and relearning of a visually conditioned response (VCR) were examined in 46 rats. Results indicate that: (a) Lesions in the anterior as well as in the posterior half of the neocortex produce a profound deficit on learning and relearning of VCRs. (b) The deficit in postoperative acquisition of VCRs is greater with the removal of the posterior than of the anterior half of the hemisphere. The removal of the posterior half alone causes the animal to perform as if it were completely neodecorticate. (c) There is no effect of previous experience on animals with rostral ablations of the neocortex. Rats with occipital removals relearn a VCR significantly better than animals without preoperative experience. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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