On Oct 17, 7:45 pm, Stathis Papaioannou <stath...@gmail.com> wrote:
> On Sun, Oct 16, 2011 at 11:44 PM, Craig Weinberg <whatsons...@gmail.com> 
> wrote:
> >> As an engineering problem as well as for the purpose of the thought
> >> experiment, we replace a part at a time and, as with the mechanic and
> >> the car, see whether it works the same. If the subject says they have
> >> gone blind or feel weird or something then the replacement part is not
> >> working properly. If they say they feel normal and they seem to you to
> >> behave normally then the replacement part is working properly.
> > I agree that would be a decent way of finding out. I'm saying that
> > they will not feel normal though, and they will most likely not behave
> > normally over time.
> But they have to say they feel normal since the speech centres of
> their brain receives the same electrical input and the neurons there
> fire in the same sequence as they normally would. Only if the neurons
> are affected by non-physical inputs (which would by assumption be
> missing if the artificial neurons are installed) would the subject be
> able to say that something was awry.

They wouldn't have to say that they feel normal, because the 'speech
centers' are not controlled by the artificial neurons. The speech
centers are used by the conscious areas of the brain so they can
vocalize anything that the subject cares to vocalize. If you were
colorblind and you replaced part of a computer monitor with an area of
pixels which looked like a perfect physical match to you, the user
would still be able to see the difference if they were the wrong
colors or monochrome.

Since we know absolutely that we have experiences which cannot be
observed directly in the tissue of the brain, there is no sense in
imagining that replicating what we observe in the brain will not be
missing crucial capacities which we can't anticipate. Even replacing
simpler organs with actual human organs have a risk of rejection. Why
would the brain, which is presumably infinitely more sensitive than a
kidney, have no problem with a completely theoretical and unrealizably
futuristic artificial device?


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