Both The vOICe auditory display and the Dobelle brain implant were developed for totally blind people, with the aim of conveying live visual information from a head-mounted camera to the brain. The effectiveness of both approaches for a visual prosthesis depends to a large extent on the neural plasticity of the human brain as required to master new or modified sensory mappings. Neuroscience research based on fMRI, PET, MEG and rTMS techniques has shown that, apart from responding to direct cortical stimulation, even the adult human brain can adapt and for instance cause the occipital cortex ("visual cortex") and visual association areas to respond to auditory stimuli. Would there be there anything that you can do with the brain implant that you cannot do with The vOICe? Which visual prosthesis approach gives you the best quality views? Which approach does not require surgery? Which approach may work even with cortical blindness? Which approach may also work for early blind people who probably have a differently organized "visual" cortex? Which approach is cheapest?