It's my guess that early brain-machine interface is going to require a fair amount of training and conditioning to interpret information across the interface. I

It's my guess that early brain-machine interface is going to require a fair amount of training and conditioning to interpret information across the interface. I think attempting to locate, isolate, and stimulate specific nerves that carry these sensation is going to be way more difficult than just exciting the receptors at the ends of those nerves. I'd anticipate "displays" emulating external stimuli preceding brain-machine interfaces.