The following is a long excerpt from an unpublished paper I wrote in 2012-2013, mostly before I was enmeshed in rationality-community ideas. The paper was a response to David Chalmers’ “hard problem of consciousness,” described well in “Facing up to the Problem of Consciousness” and “Consciousness and its Place in Nature.”
Chalmers gives various arguments for thinking that phenomenal consciousness isn’t reducible to merely physical facts. A complete reductive explanation must make it logically impossible for the reduced entity to differ in any way unless the thing you’re reducing it to also differs in some way. Chalmers argues that reductions of consciousness to physical facts can never be complete in this sense, because there is some aspect of consciousness that could in principle vary without varying any physical fact. This aspect is the first-person, subjective, phenomenal character of consciousness; what it actually feels like “from the inside” to instantiate conscious states.
I accept Chalmers’ arguments, for reasons I detail in an earlier section of the paper but won’t go into here. Rather, I agree with him that phenomenal reductionism is probably false; but Chalmers’ own position, which I call phenomenal fundamentalism (the idea that there are irreducible phenomenal states), also commits us to absurdities.
Eliezer Yudkowsky’s “Zombies! Zombies?” does a good job of articulating the core problem with non-interactionist fundamentalism, though I didn’t really understand this argument’s force at the time. Sean Carroll’s “Telekinesis and Quantum Field Theory” dispenses with interactionist fundamentalism.
By process of elimination, I conclude that phenomenal anti-realism, or eliminativism, is probably true: phenomenal consciousness is neither reducible nor irreducible (in our universe), because it doesn’t exist.
This idea seems absurd, so I endorse it only grudgingly: it’s absurd, but less absurd than the two alternatives.
There are a number of obvious objections to the idea. While I think some of these objections are partly successful, I think on the whole they aren’t successful enough to make eliminativism a worse option than reductionism and fundamentalism. Here, I’ll try to systematically address a large number of possible objections. In the process I’ll hopefully clarify for some people what I mean by “eliminativism.”
Be warned that the following is not my standard fare. It’s very much written for an audience of professional analytic philosophers, and is pretty relentless about pursuing fine distinctions and subtle counter-arguments. I think this is warranted by the fact that eliminativism is such a strange view. Philosophers to date have reasonably complained that anti-fundamentalists like Dennett and Yudkowsky have been needlessly sloppy and imprecise. My view is that the arguments of anti-fundamentalists have exhibited less rigor than those of fundamentalists for contingent historical reasons, and this shouldn’t be taken to indicate that the underlying idea is fragile and liable to collapse under close scrutiny.