Temporary double representation in expanded ipsilateral retinocollicular projection of neonatally one-eye-removed rats.

Retinotopic representations of the expanded projection to the ipsilateral colliculus were studied in albino rats of various ages after neonatal unilateral eye removal. Besides the projection from the lower temporal retina the projection from the central retina was observed in 3-6 month-old one-eyed rats. Such double retinotopic representation was not observed in 1-month- or 1-year-old one-eyed rats. A postnatally growing temporary process was suggested for the expanded ipsilateral retinocollicular projection in rats.