On 7/22/2019 1:35 PM, Stathis Papaioannou wrote:
Brain scans might have some bearing on whether not your brain can
be replaced by some equivalent digital device. Once you can do
this, questions about personal identity become an empirical
matter, as has been pointed out several times.
The substantive problem is a philosophical one, since by assumption in
these debates the copied brain is identical by any empirical test.
But what if, as seems likely to me, it is theoretically impossible to
copy a brain to a level that it undetectable, i.e. it will necessarily
be possible to distinguish physical differences. Now these differences
may not matter to consciousness, or they may imply only a brief glitch
at the conscious/classical level, but we know from Holevo's theorem that
the duplicate can't be known to be in the same state.
Brent
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