In the early 1930's, Foerster investigated the effect of electrically stimulating the exposed occipital pole of one cerebral hemisphere. He found that, when a point at the extreme occipital pole was stimulated, the patient perceived a small spot of light .Subsequently, Brindley and Lewin (1968) thoroughly studied electrical stimulation of the human occipital (visual) cortex by varying the stimulation parameters to apply stimulation on small groups and even on individual retinal cells to generate "Mind's Eye" sight.

Neural tissue can be artificially stimulated by  passage of current to change in electrical potentials across visual neuronal membranes, which can initiate visual neuron action potentials, which are the means of occipital  information transfer in the nervous system.

It is possible to input information into the nervous system by coding the information as a sequence of electrical pulses which are relayed to the nervous system

Several patents issued between 2003 and 2006 have been issued to induce visual contextual "inner sight" that is only seen by the individual who has been targeted for  remote "second sight" transmissions  that require no neural  prosthetic device ...according to those stimulated with this technology the participants describe their visual over -ride as being "holographic(three -dimensional) or hallucinatory in nature