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Visual perception must often be dependent on bilateral neural interaction between the visual areas of the two cerebral hemispheres, or between the two sides of the brain at other levels of the central visual system. The need for this interaction arises as a result of the anatomical relations between the retinas and the nervous system, which a r e such that the homonymous halves of the retinas are represented in the separate cerebral hemispheres. Anatomical facts lead naturally to the presumption that the corpus callosum plays a n important role in this bilateral interaction. Accordingly, a group of patients with surgical section of the corpus callosum provided an opportunity to investigate the extent to which conections between the cerebral cortices participate in visual discriminations apparently dependent on integration of function between the two sides of the b r a h a Measurements hgve been made of binocular depth perception, binocular fusion and movement perception which involved heteronymous stimulation of the eyes. The patients investigated had undergone a surgical operation of which the corpus callosum was partly or completely sectioned in order to control convulsive disorders.'