"And just who are these people in the machine, anyway? The answer will depend on who you ask. If you ask the people in the machine, they will strenuously claim to be the original persons. For example, if we scan–let’s say myself–and record the exact state, level, and position of every neurotransmitter, synapse, neural connection, and every other relevant detail, and then reinstantiate this massive data base of information (which I estimate at thousands of trillions of bytes) into a neural computer of sufficient capacity, the person who then emerges in the machine will think that “he” is (and had been) me, or at least he will act that way. He will say “I grew up in Queens, New York, went to college at MIT, stayed in the Boston area, started and sold a few artificial intelligence companies, walked into a scanner there, and woke up in the machine here. Hey, this technology really works.”
Is this really me? For one thing, old biological Ray (that’s me) still exists. I’ll still be here in my carbon-cell-based brain. Alas, I will have to sit back and watch the new Ray succeed in endeavors that I could only dream of."
by Ray Kurzweil