THE PROJECTION OF THE BINOCULAR VISUAL FIELD ON THE OPTIC TECTA OF THE FROG

The projection of the binocular visual field on the optic tecta of Rana temporaria has been mapped by recording action potentials evoked in the tectum by a spot of light in the visual field. The binocular visual field extends for about 100° on the horizontal meridian. Only the central region of the binocular field is represented through both eyes on both ipsilateral and contralateral tecta. The binocular field to the left and right of this central region is represented through both eyes on one tectum only: the left side of the field projects through both eyes to the right optic tectum, while the right side of the field projects through both eyes to the left tectum. Corresponding retinal points project to the same tectal locus.