(Substantive update ["UPDATE II"] below the fold.)
Mark Kleiman contends that
the question of how the mechanics of
neurons, synapses, and
neurotransmitters produces the subjective experience of consciousness
[is] not a question that can be answered by the analysis of
matter-in-motion, because consciousness and its operations, such as
knowing and intending, inescapably involve immaterial entities and
relations.
This begs the question, because of course if naturalism is correct,
then knowing and intending inescapably involve entities that are
material through and through. So I think the correct thing to say, the most that we can say, is that mental properties and
attitudes pose an explanatory problem that is as perplexing now as the
problem of gravitational "action at a distance" was in Newton's time
(and, let's admit it, in some ways probably still is). This mysterium fascinas
might invite the illicit, Berkeleyan temptation, but given the continued
success we've enjoyed on the naturalist assumptions of science, it
seems pretty clear that physicalism is a better induction.
And
while I appreciate Mark's point (not quoted above) about the tendency
toward tone-deafness about "spiritual"
questions among some atheists (though admittedly not among those he
names), it's important to see that we can motivate those questions even
on the physicalist
picture, namely, by pointing out that even if we could translate all
our experience into nature (and vice versa), we still couldn't grok
what it means to be a conscious physical system (even though we
necessarily know "what it's like"). After all, there's no reason a priori
to think that once endowed with an ideally complete physics we could
convert all the true propositions about the microstructure of a brain
in the thrall of some experience or another into isomorphic phenomenal
content in our own. That would be a bit like having a complete physical
description of a
typical desktop running Linux and a complete understanding of the
relevant
programming languages at all levels of hierarchy, and thinking that
based on
that you could make iTunes play Le Sacre du Printemps by
typing MIPS instructions into Word. (Or something like that.)
Anyway, as with most any post by Mark Kleiman, you should read the whole thing.
UPDATE: John Holbo posts on a related matter.
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