Le 01-déc.-06, à 10:24, Stathis Papaioannou a écrit :
> Bruno Marchal writes:
>>> We can assume that the structural difference makes a difference to
>>> consciousness but
>>> not external behaviour. For example, it may cause spectrum reversal.
>> Let us suppose you are right. This would mean that there is
>> substitution level such that the digital copy person would act AS IF
>> she has been duplicated at the correct level, but having or living a
>> (1-person) spectrum reversal.
>> Now what could that mean? Let us interview the copy and ask her the
>> color of the sky. Having the same external behavior as the original,
>> she will told us the usual answer: blue (I suppose a sunny day!).
>> So, apparently she is not 1-aware of that spectrum reversal. This
>> that from her 1-person point of view, there was no spectrum reversal,
>> but obviously there is no 3-description of it either ....
>> So I am not sure your assertion make sense. I agree that if we take an
>> incorrect substitution level, the copy could experience a spectrum
>> reversal, but then the person will complain to her doctor saying
>> something like "I have not been copied correctly", and will not pay
>> doctor bill (but this is a different external behaviour, ok?)
> I don't doubt that there is some substitution level that preserves 3rd
> behaviour and 1st person experience, even if this turns out to mean
> a person to the same engineering tolerances as nature has specified
> for ordinary
> day to day life. The question is, is there some substitution level
> which preserves
> 3rd person behaviour but not 1st person experience? For example,
> you carried around with you a device which monitored all your
> behaviour in great
> detail, created predictive models, compared its predictions with your
> behaviour, and continuously refined its models. Over time, this device
> might be
> able to mimic your behaviour closely enough such that it could take
> over control of
> your body from your brain and no-one would be able to tell that the
> had occurred. I don't think it would be unreasonable to wonder whether
> this copy
> experiences the same thing when it looks at the sky and declares it to
> be blue as
> you do before the substitution.
Thanks for the precision.
It *is* as reasonable to ask such a question as it is reasonable to ask
if tomorrow my first person experience will not indeed permute my blue
and orange qualia *including my memories of it* in such a way that my
3-behavior will remain unchanged. In that case we are back to the
original spectrum reversal problem.
This is a reasonable question in the sense that the answer can be shown
relatively (!) undecidable: it is not verifiable by any external means,
nor by the first person itself. We could as well conclude that such a
change occurs each time the magnetic poles permute, or that it changes
at each season, etc.
*But* (curiously enough perhaps) such a change can be shown to be
guess-able by some richer machine.
The spectrum reversal question points on the gap between the 1 and 3
descriptions. With acomp your question should be addressable in the
terms of the modal logic Z and X, or more precisely Z1* minus Z1 and
X1* minus X1, that is their true but unprovable (and undecidable)
propositions. Note that the question makes no sense at all for the
"pure 1-person" because S4Grz1* minus S4Grz1 is empty.
So your question makes sense because at the level of the fourth and
fifth hypo your question can be translated into purely arithmetical
propositions, which although highly undecidable by the machine itself
can be decided by some richer machine.
And I would say, without doing the calculus which is rather complex,
that the answer could very well be positive indeed, but this remains to
be proved. At least the unexpected nuances between computability,
provability, knowability, observability, perceivability (all redefined
by modal variant of G) gives plenty room for this, indeed.
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