NYTimes | Those
who make the Very Large Mistake (of thinking they know enough about the
nature of the physical to know that consciousness can’t be physical)
tend to split into two groups. Members of the first group remain
unshaken in their belief that consciousness exists, and conclude that
there must be some sort of nonphysical stuff: They tend to become
“dualists.” Members of the second group, passionately committed to the
idea that everything is physical, make the most extraordinary move that
has ever been made in the history of human thought. They deny the
existence of consciousness: They become “eliminativists.”
This
amazing phenomenon (the denial of the existence of consciousness) is a
subject for another time. The present point — it’s worth repeating many
times — is that no one has to react in either of these ways. All they
have to do is grasp the fundamental respect in which we don’t know the
intrinsic nature of physical stuff in spite of all that physics tells
us. In particular, we don’t know anything about the physical that gives
us good reason to think that consciousness can’t be wholly physical.
It’s worth adding that one can fully accept this even if one is
unwilling to agree with Russell that in having conscious experience we
thereby know something about the intrinsic nature of physical reality.
So
the hard problem is the problem of matter (physical stuff in general).
If physics made any claim that couldn’t be squared with the fact that
our conscious experience is brain activity, then I believe that claim
would be false. But physics doesn’t do any such thing. It’s not the
physics picture of matter that’s the problem; it’s the ordinary everyday
picture of matter. It’s ironic that the people who are most likely to
doubt or deny the existence of consciousness (on the ground that
everything is physical, and that consciousness can’t possibly be
physical) are also those who are most insistent on the primacy of
science, because it is precisely science that makes the key point shine
most brightly: the point that there is a fundamental respect in which
ultimate intrinsic nature of the stuff of the universe is unknown to us —
except insofar as it is consciousness.
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