Columnar and Laminar Segregation of Retinal Input to the Primate Superior Colliculus

After the lateral geniculate nucleus, the superior colliculus is the most plentiful target of retinal projections in primates. Classically, tritium autoradiography was used to show that axon terminals emanating from one eye form irregular columns in the tectum. Unlabeled gaps were thought to be filled by the other eye, but this assumption has never been tested directly. Alternatively, ocular inputs might overlap