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ChristianKl comments on [Open Thread] Stupid Questions (2014-02-17) - Less Wrong
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This is probably a stupid question:
How is rounding error not a fatal flaw in brain simulation? Meaning, even if you could copy the workings of someones brain perfectly, it's presumably still a calculation done on some computer in some way. So even if you store the first X digits of every number in the calculation, it would at some point diverge from what the real brain did, even if it took a very long time.
Therefore is it fair to call that copy that 'person' or rather do you have to switch to speaking in terms of fidelities: that copy is Y percent the original person and diverges at a rate of Z percent every so many steps?
Even an actually person diverges from who they are at 20 years of age to who they are at 40 years of age. Calling the person over that timeframe the same person means that you do allow some changes.
As far as I understand proponent of uploading think that the brain will be simulated enough that the changes in the person will be as trivial as a few years of learning.