I don't acknowledge an upload as "me" in any meaningful sense of the term; if I copied my brain to a computer and then my body was destroyed, I still think of that as death and would try to avoid it.
A thought struck me a few minutes ago that seems like it might get around that, though. Suppose that rather than copying my brain, I adjoined it to some external computer in a kind of reverse-Ebborian act; electrically connecting my synapses to a big block of computrons that I can consciously perform I/O to. Over the course of life and improved tech, that block expands until, as a percentage, most of my thought processes are going on in the machine-part of me. Eventually my meat brain dies -- but the silicon part of me lives on. I think I would probably still consider that "me" in a meaningful sense. Intuitively I feel like I should treat it as the equivalent of minor brain damage.
Obviously, one could shorten the period of dual-life arbitrarily and I can't point to a specific line where expanded-then-contracted-consciousness turns into copying-then-death. The line that immediately comes to mind is "whenever I start to feel like the technological expansion of my mind is no longer an external module, but the main component," but that feels like unjustified punting.
I'm curious what other people think, particularly those that share my position on destructive uploads.
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Edited to add:
Compare a destructive upload to non-destructive. Copy my mind to a machine non-destructively, and I still identify with meat-me. You could let machine-me run for a day, or a week, or a year, and only then kill off meat-me. I don't like that option and would be confused by someone who did. Destructive uploads feel like the limit of that case, where the time interval approaches zero and I am killed and copied in the same moment. As with the case outlined above, I don't see a crossed line where it stops being death and starts being transition.
An expand-contract with interval zero is effectively a destructive upload. So is a copy-kill with interval zero. So the two appear to be mirror images, with a discontinuity at the limit. Approach destructive uploads from the copy-then-kill side, and it feels clearly like death. Approach them from the expand-then-contract side, and it feels like continuous identity. Yet at the limit between them they turn into the same operation.
Yes, it is of importance to the me right here, right now, in the present. Under one interpretation I wake up in the other room. In the other I do not - it is some other doppelgänger which shares my memories but whose experiences I do not get to have.
If I somehow find myself in the room with my clone, it's true that there's no way short of checking external evidence like security footage or somesuch to determine which is the real me. That is true. But that is a statement about my knowledge, not the world as it exists. The map is not the territory.
If I were to wake up in the other room with the clone nearby, it no longer matters which one of us is the original or not. He isn't me. He is a separate person that just happens to share all of the same memories and motivations that I have. I want to say that I wouldn't even give this copy of me the time of day, but that would be rhetorical. In some ventures he would be my greatest friend, in others my worst enemy. (Interestingly I could accuratly tell which right now by application of decision theory to the variants of the prisoner's delima.) But even when I choose to interfere in his affairs, it is not for directly self-serving reasons - I help him for the same reason I'd help a really close friend, I hurt him for the same reason I'd hinder a competitor.
The truth has real implications for the me that does exist, in the here and now. Do I spend not-insignificant sums of money on life insurance to cover cryonic preservation for me and my family, thereby foregoing other opportunities? Do I consider assisted suicide and cryonic preservation when I am diagnosed with a terminal or dibilitating disese of the brain? Do I stipulate revival instead of uploading in my cryonics contract, knowing that it might mean never being revived if the technology can not be developed before my brain deteriorates too much? Do I continue to spend time debating this philosophical point with other people on the Internet, in the hope that they too choose revival and there is safety in numbers?
I don't understand how to distinguish "the clone is you" from "the clone is a copy of you". Those seem like identical statements, in that the worlds where yon continue living and the world where the clone replaces you are identical, atom for atom. Do you disagree? Or do you think there can be a distinction between identical worlds? If so, what is it?
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