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selfAdjoint
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In his opening post on Chapter Seven of Gregg Rosenberg's A Place for Consciousness, Hypnagogue says this:
Now there have already been several replies to this on the original thread, and most of them seem delighted that the unwarranted claim of physicalism that nature is causally closed under physics is being challenged. I want to open the opposite conclusion for discussion.
It seems that what Rosenberg is doing here is denial of his, and the qualists' problems. He has come close to admitting that if nature is causally closed under physical interactions, then the qualist position is just what they have accused the physicalist position of being: incoherent. On the horns of a dilemma between epiphenomenalism and dualism, as he says.
Now if your premises lead you to a false conclusion, you should reject those premises. This is the basis of the famous proof technique called reduction ad absurdam in logic and contrapositive in mathematics. And the only reason to suppose that natrue is not causally closed under physics is that the qualist premises require it!
Do a thought experiment; leave the qualist position out, and try to imagine any evidence for non-closure under physical causes. Science is often accused on these boards of ignoring everything outside of physical causes, but it does that because it works! No experiment has ever shown any force or energy flow other than physical ones. And indeed if there are non-physical forces, that are truly causal, then you are back at dualism in all but words, since you have posited an independent principle required to explain the world.
If physicalism is false, and if the world is causally closed under physics, it appears as if there is no room for p-consciousness to make a causal contribution to brain events. But clearly, our knowledge claims about p-consciousness (e.g. "I know that I am conscious right now") are driven by physical brain events. If p-consciousness is irrelevant to the causal dynamics of the brain, then, it seems that it can play no role in producing our knowledge claims about it. In short, it seems as if our knowledge claims about p-consciousness should bear no relevance to the phenomenon itself; we should have no way to really know that we are p-conscious, even though we claim that we are.
It appears as if the knowledge paradox forces the Liberal Naturalist to be caught on the dual horns of interactionist dualism and epiphenomenalism. We can escape the conundrum of the knowledge paradox if we deny the causal closure of the physical and claim that non-physical p-consciousness really does directly influence the physical dynamics of the brain. The resulting interactionist dualist ontology presents significant further problems, however, and there is no strong evidence that the world is not causally closed under physics. If we reject interactionism, we can bite the bullet and propose that p-consciousness is epiphenomenal on brain events. On this view, p-consciousness is lawfully correlated with brain events, but still does not make any contribution to their causal dynamics. Epiphenomenalism is not much better than interactionism, as it still presents us with significant problems. While knowledge claims about p-consciousness would be true under epiphenomenalism, it seems they would not be justified. Rather, they would be more like lucky coincidences, since there would be no mechanism by which we could attain reasons for making these claims. Our physical brains would cause us to utter that we are p-conscious, and mere serendipity would have it that we were in fact correct. If the laws enforcing the epiphenomenal correlation between brain events and p-conscious events were to somehow be shut off, we would go on (falsely) claiming that we are p-conscious, none the wiser.
Now there have already been several replies to this on the original thread, and most of them seem delighted that the unwarranted claim of physicalism that nature is causally closed under physics is being challenged. I want to open the opposite conclusion for discussion.
It seems that what Rosenberg is doing here is denial of his, and the qualists' problems. He has come close to admitting that if nature is causally closed under physical interactions, then the qualist position is just what they have accused the physicalist position of being: incoherent. On the horns of a dilemma between epiphenomenalism and dualism, as he says.
Now if your premises lead you to a false conclusion, you should reject those premises. This is the basis of the famous proof technique called reduction ad absurdam in logic and contrapositive in mathematics. And the only reason to suppose that natrue is not causally closed under physics is that the qualist premises require it!
Do a thought experiment; leave the qualist position out, and try to imagine any evidence for non-closure under physical causes. Science is often accused on these boards of ignoring everything outside of physical causes, but it does that because it works! No experiment has ever shown any force or energy flow other than physical ones. And indeed if there are non-physical forces, that are truly causal, then you are back at dualism in all but words, since you have posited an independent principle required to explain the world.