Role of neocortex in the learning and relearning of two visual habits by the rat.

Abstract
Effects of removal of posterior and anterior portions of neocortex on acquisition and relearning of pattern and brightness discriminations were examined in 213 rats. Anterior and posterior lesions produced characteristic and independent changes in the courses of learning and relearning a brightness discrimination. Effects of visual lesions were the same for learning and relearning of a black-white habit, whereas an anterior lesion retarded learning more than relearning. Discrimination of patterns was unaffected by anterior removals and eliminated by posterior removals. The results are viewed as supporting and extending some classical concepts of Lashley.