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October 1976

Physiological Aspects of Visual Perception-Reply

Author Affiliations

3 Mercer Circle Cambridge, MA 02138

Arch Neurol. 1976;33(10):730. doi:10.1001/archneur.1976.00500100064021

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In Reply.  —Dr Goldberg makes many erroneous statements. We did not describe "blindness after collicular lesion" either in 1962 or in 1976. We were interested in the nature of the response to visual stimulus remaining after recovery from bilateral complete ablation of the superior colliculus. We carefully described the great facilitation of visual identification of still objects if a small rostral fragment of one colliculus, with its related corticomesencephalic fibers, remained intact. The lesions described by Pasik et al were incomplete, and this crucial area is not illustrated in their charts. Those of Rosvold et al spared this area, and those of Anderson and Symmes spare its lateral part, even in their most severe lesion.The remarkable defect in perception in the immediate postoperative period that we described was also noted by Anderson and Symmes, and in their most complete animal by Pasik et al. Dr Goldberg should also read those articles

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