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Where it starts to get murky is when we add the downloading issue into the mix and end up with copies. At the instant the download is complete and the "new you" is turned on, you are no longer a single minded entity. What then? Can we say we are still in essence a single entity but with two minds ... a "multiprocessor unit" with independent sensory inputs capable of simultaneous autonomous operation? Would many of such copies take on the persona similar to that of a "corporate entity", where all the "yous" are partly responsible for the actions of the collective? Or would the new "yous" be considered nothing more than advanced desktop computers and be considered property you could switch off at will?
I'm a little confused at what you're saying here. After a second reading, it appears you mean each mind controlling its own body (or robot simulation of a body or whatever). I at first thought you might mean several copies of the mind controlling one body.
I don't see such things being anything like a single entity. It's true they share the same exact knowledge until the copies were made, but from there they would communicate with one another the same way they communicate with other people. They'd of course have all the skills of the original, and of the original could dance like Michael Jackson, they could all put on a heck of a show, but I don't see where they would be like a "corporate" or "hive" mind.
As far as the copies being "property" one could switch off at any time, I think they might pretty quickly achieve legal status as persons. For one thing, they should certainly pass the Turing Test or any variation of it as well as any flesh-and-blood human.
Whether we like it or not, if we keep progressing the way we are, these are the kinds of issues we're facing. It's exciting and frightening at the same time. We live in amazing times.
j.r.
Things have been this way for a while now. Gutenberg made one of the most disruptive technologies ever (imagine a book reproduced at a rate many times that of hand copying!), and we're living the ramifications of that. Such new technologies are showing up more and more frequently, and the more it happens, more people notice the change not just in technology, but that such changes have effects on human culture.
Science Fiction has been around for a century or so and part of its reason for existence (besides the main reason of it being entertaining) is to explore the ramifications of scientific and technological change. Notable is the book "The Mind's I" (have I mentioned it yet?) that has at least one short story and discussion on the ramifications of exactly this technology (mind uploading/body duplication/transportation).