machine brains

Malcolm McMahon malcolm at pigsty.demon.co.uk
Fri Mar 5 01:52:44 EST 1999


On Thu, 04 Mar 1999 08:34:04 -0500, Michael Edelman <mje at mich.com>
wrote:

>
>
>
>Is there in fact a clear distinction in digital computers? Other than the fact that we
>know, a priori, that programs have to be loaded into computers, the distinction isn't
>really clear. To an outside observer the program is a essentially description of the
>state transitions in the digital computer. It's not clear what constitutes program and
>what constitutes data

But it _is_ pretty clear what constitutes wiring and what constitute
transient electrical states in that wiring.

>
>The brain similarly looks like an voltage-based analog device at the level of the
>neuron, and a rate-responsive device at a higher level. At some very high level it
>looks rather like an intelligent entity. Nonetheless it could theoretically be
>described at any instant in time by a very large set of differential equations that
>would predict what the voltages would be in the next millisecond.
>

Here's the point though. Information stored in the brain isn't just
electrical states, it goes, in fact, beyond chemical states into actual
changes in the brain's layout. New synapses form while other disappear.
You can give someone ECT and completely scramble the electrical state of
the brain but only short term memories are affected.

>> And, BTW, I still don't see any reason to believe consciousness is part
>> of the mind.
>
>That strikes me more as a definition than as a statement regarding function. Does
>conciousness exist? Well, we all certainly have the phenomenological experience of
>conciousness, and we believe that others do as well, and all act in our day to day
>lives as if we and others do. That certainly suggests not only that  conciousness is
>an important enough phenomenon to study, but that it is possible to study it in
>objective ways.

But our only awareness of consciousness is inherently subjective. We
can't perceive consciousness, only experience it.




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