Of 21 pigmented rats, 13 were surgically restricted to a single cerebral hemisphere and were then sequentially given monocular training on each of 2 diametrically opposed visual pattern discriminations mediated by opposite eyes. 8 served as controls. All but 4 Ss (3 operated and 1 control) were able to learn the opposing discriminations. Acquisition by way of ipsilateral visual pathways was slower than acquisition by way of fibers from the contralateral eye, a finding consistent with known anatomic density of the two optic fiber systems.
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