Sorry for being so brief, I'm not well read on the matter. It's been about a year since I've looked into it so sorry if I muck up. Basically the question is "Where is the mind?" If you believe in a soul than you'd suppose that the mind is ethereal and only connected and communicating through the flesh of the brain. The other opinion that I know of is Naturalism or something to that effect, which states that the mind is a representation of physical states of the flesh. Just the same way that digestion is done by the digestive tract and not etherically linked to it. This is the opinion I hold simply since I haven't read a convincing argument against it. Unfortunately if the mind and brain are one in the same, it is impossible to transfer, and any attempt at doing so would just be making a copy.