A study is reported in which the cortical responses to monocular and binocular scanning of patterned stimuli, both simple and complex, were recorded. In particular, the computer-summated parieto-occipital potentials, time-locked to eye movement (the lambda response), were used. No over-all asymmetries appeared between the hemispheres, whether the scanning was monocular or binocular, although responses were in general of greater amplitude for binocular than for monocular scanning. However, there were individual and other differences which were thought to be related to complex parameters of the lambda response itself.