On 09 Apr 2015, at 01:29, Bruce Kellett wrote:
Bruno Marchal wrote:
The main point is that for a physical universe to exists in some
primary form, you have to abandon the idea that a brain is Turing
emulable.
Not so. You essentially admit as much in the 'yes doctor' scenario.
If you are happy to replace your physical brain with one simulated
in a computer, then you are saying that the physical brain is Turing
emulable.
The relevant part for my consciousness. No need to emulate the whole
physics of the brain.
This stands to reason if you believe that the brain is essentially
classical in its operation -- it is large and warm so quantum
effects decohere far too rapidly to have any significant large-scale
effect. The operation of this physical object is then completely
classical, and determined by physical laws that are deterministic.
If you know the laws and the initial conditions, then the future
activity of that brain can be completely calculated on a computer.
Even if it is a quantum computer. OK.
The problem, of course, arises with the requirement that you know,
or can determine, the initial conditions. I suggest that this is
impossible in principle. Physical limitations are such that in any
attempt to extract a complete map of the state of a living brain at
any instant, the machinery would destroy the brain *before* any such
map could be completed.
That is not really relevant. I suppose a high comp level in step 1-6,
to ease the argument, but at step seven, we need only the concrete UD,
and at step 8 the UD which exist and is run in arithmetic.
'Yes doctor' fails because the necessary starting conditions cannot
be realized for physical reasons.
OK. But then comp is already false, and you make my point.
This does not mean that one cannot create a physical computer that
completely models the human brain -- in other words, you could
create a conscious human-like entity. But you would necessarily
always create a /different/ person in this way, not a copy of an
existing person.
That depends on the level, and is not relevant for the reversal. Your
FPI still rely on just the copies in arithmetic, after step 7 and 8.
But whether these means that consciousness is primarily
computational or primarily physical is just a matter of which way
the rabbit jumps.
?
Bruno
Bruce
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