In order to improve either quality and deepness of the neurological examination, we have implemented a computerized apparatus able to provide bidimensional visual stimuli with a space of tridimensional neutral (gray) color. By exploiting the natural ability of the visual system to manage the visual disparity between right and left eyes, we have ben able to generate a structure with a plane entering or emerging from an euclidean space. This kind of 2-D stimulation has demonstrated to be able to stimulate an evoked potentials in the occipital cortex.