From: hal@rain.org
Date: Wed Mar 31 1999 - 23:25:05 MST
Billy Brown, <bbrown@conemsco.com>, writes:
> hal@rain.org wrote:
> > A. It is a matter of interpretation whether a given system can be
> > described as a computer running a specified program P
>
> This proposition is definitely false.
>
> It is true that information content is largely observer-dependant, in the
> sense that I can choose any scheme I like for mapping physical phenomena to
> data. In this sense you could view any complex object as encoding all sorts
> of different programs, using many different schemes. However, this does not
> imply that any system can be interpreted as 'a computer running a specified
> program P'.
So would you agree that my couch could be interpreted as having the same
structure as any given program P? Perhaps even that the couch could be
interpreted as encoding the same structure as a snapshot of Einstein's
brain? And that the reality and validity of this interpretation is as
strong as viewing Einstein's brain as encoding that same structure?
> [...]
> The problem lies in the fact that a computer is not a static body of data.
> One could view your couch as encoding a complete blueprint for my computer,
> but that is not the same thing as actually being one. To qualify as
> actually being a computer, your couch must display a certain range of
> behaviors in response to environmental stimuli. It has to maintain an
> ongoing chain of appropriate, causally connected states while running a
> program. The thermal vibrations in your couch are never going to display
> this behavior, no matter what encoding scheme you use.
Are you drawing a distinction between an encoding of a single state,
versus an encoding of a sequence of states? You can see the couch
encoding any given structure, but you can't see it encoding a specified
sequence of complex structures (say, the sequence that a programmed
computer or a brain goes through)?
Or is the issue here the fact that the sequence of structures are not
"causally connected"? We can set up a mapping by which the couch goes
through a sequence of states with the same structure as a sequence of
states in Einstein's brain. But perhaps we would say that the causal
relationship of these states is not the same, because *if* we had tweaked
some aspect of Einstein's brain state at a given moment, it would have
led to changes in the pattern of succeeding states. But making the
corresponding change to the state of the couch would not have led to
the same kind of changes in the succeeding couch states.
Hal
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