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Why good medicine requires materialism

Posted in Denialism by Skepdude on October 30, 2008


I don’t like to repost, but Steve Novella has some great pieces up right now, and this is directly related. –PalMD

s I’ve clearly demonstrated in earlier posts, I’m no philosopher. But I am a doctor, and, I believe, a good one at that, and I find some of this talk about “non-materialist” perspectives in science to be frankly disturbing, and not a little dangerous.

To catch you up on things, consider reading one of Steve Novella’s best posts ever over at Neurologica. While you are there, you can also follow his debate with neurosurgeon Michael Egnor, the latest guru of mind-body dualism.

To sum up (remember, IANAP), most of us science-y types hold to a materialist view of reality, that is, reality is all there is. This reality is susceptible to the investigations of science. Non-materialists and mind-body dualists hold that there is also a “non-material” reality. What exactly this might be, and how one might observe or measure it is never specified. Instead, they usually use a god-of-the-gaps argument, whereby any gaps in scientific understanding are automatically ascribed to the supernatural. The proof of the supernatural is stated is a lack of disproof of the supernatural.

Personally, I have no problem with people believing in God, Satan, fairies, or the Flying Spaghetti Monster (may we all be touched by His Noodley Appendages). What I have a problem with is people applying these beliefs to science and medicine.

Non-scientific medical practices, such as homeopathy, faith-healing, and reiki state various claims of efficacy and of mechanism of action. They can never prove these, but ask us to take their word, and the word of their clients. Once again, if someone takes communion and feels closer to their God, it’s none of my business. But if someone is claiming to affect the health of an individual by invoking supernatural powers, this is immoral and harmful

The point is simple: if reiki manipulates unseen, unmeasurable forces by unseen and unmeasurable means, creating solely subjective individual results, then reiki (and practices like it) is completely irrelevant to health. What matters in medicine is results, and results that cannot be observed and measured do not, for all practical purposes, exist.

We can measure the effect of beta blockers on a population of heart attack survivors. We can compare the number of subsequent heart attacks in those who do and do not receive the drug. We can come up with a scientifically valid explanation for the results, and we can replicate them.

None of the cult medicine practices that are so popular can do this. Their effects are either unmeasurable by definition (show me a qi), or when we try to measure the results of their application, results in aggregate are no better than by chance alone.

In all this discussion about naturopathy over the last week or so, what has been left out is that it doesn’t matter if naturopaths consider what they do to be “medicine-plus”—the plus is irrelevant because it cannot be measured or observed reliably. Unless and until it can, forget the “plus”. It’s only a dream.



Reports of the Demise of Materialism Are Premature

Posted in Neurologica by Skepdude on October 23, 2008

The New Scientist has recently discovered what readers of this blog have known for a while – that the denial of materialist neuroscience is the “new creationism.”  In fact I have written extensively over the past year about the embrace by the Discovery Institute (an intelligent design group) of cartesian dualism, the notion that the mind is a different substance from the brain. The primary proponent of this argument for the DI (and a frequent foil of my blog entries) is Michael Egnor, a creationist neurosurgeon. But the New Scientist article correctly points out that this is actually part of a larger movement and a larger strategy.

The Wedge Strategy

This current attack on neuroscience has the same underlying roots as the ID attack on evolution – the real enemy for ID proponents is materialism. The infamous Wedge document makes this clear in its opening paragraphs:

The proposition that human beings are created in the image of God is one of the bedrock principles on which Western civilization was built. Its influence can be detected in most, if not all, of the West’s greatest achievements, including representative democracy, human rights, free enterprise, and progress in the arts and sciences.


The zombification of philosophy (of mind)

Posted in Rationally Speaking by Skepdude on July 30, 2008


David Chalmers is a famous philosopher of mind. His fame rests in great part on his 1996 book, The Conscious Mind: In Search of a Fundamental Theory. It’s too bad that the crucial idea behind the book, dualism, is hopelessly flawed, and — more surprising yet — that Chalmers got away with one of the most idiotic thought experiments ever, which a lot of people inexplicably seem to think is oh so very clever. This all came back to (my) mind because of a recent article in Philosophy Now by Rebecca Hanrahan (an assistant professor of philosophy at Whitman College in Washington state), who’s finally got the chutzpah to point out the obvious, telling it like it is about Chalmers’ famous “zombie argument.”

Let us start by recalling what dualism is: in philosophy the idea traces back at least to Descartes (though some would consider Plato a dualist), and his contention that while everything else in humans and animals is “mechanical” (i.e., made of matter), the mind is an exception, since it’s made of some kind of distinct mind stuff (he was pretty vague about exactly what this mind stuff might be, and so is Chalmers, incidentally). Descartes immediately got into trouble because he couldn’t provide an account of how is it that the non-material mind seems to interact so well with the physical world and have tangible effects (that’s what happens every time, say, you make up your “mind” of wanting a martini, and your body responds by walking you to the bar and starting the shaking of spirits and the piling of olives).

Descartes then famously dug himself even deeper into an intellectual quagmire when he proposed that the place where (somehow) mind stuff and body stuff “meet” is the pineal gland, at the center of the brain. Turns out that we now know that the pineal gland is actually involved in the production of melatonin which, while important in keeping the day/night cycle straight (it helps with jet lag), and likely relevant to normal sexuality (the gland is larger in children, where it inhibits sexual development) is far from the seat of the soul. If it were, most of us would be in trouble because in many adults the gland calcifies, becoming essentially non functional.

Back to Chalmers. He claimed to have revived dualism — despite the generally bad reputation the word has even among philosophers — and developed the following argument in support of his startling conclusion (this is Hanrahan’s, I think fair, formalization of if):

premise 1: We can conceive of a world populated by some zombie twins, who act exactly as we do, have our same physiology and internal structure, our brain and our psychology. But they do not have any conscious experience whatsoever.

premise 2: Conceivability provides us with a guide to possibility.

premise 3: It is possible that there is a world populated by our zombie twins.

conclusion 1: If this is possible, then materialism [the idea that everything is made of matter/energy] is false.

conclusion 2: If materialism is false, then dualism is true.

QED (Quod Erat Demonstrandum, as we wished to demonstrate)

I refer you to Hanrahan’s short and eminently digestible article for the details, but you can easily see that even if one of the stated premises is not true, then none of the conclusions will follow. Now, let’s take a look at the three premises, beginning with the last one, p3.

I suppose that it is possible that there may be living beings that are made like us but do not have conscious experiences, although they would be really strange beings. I find that possibility to be extremely unlikely, but I don’t see that it contradicts any known physical or logical law. p1 is also true: we can indeed conceive of the kind of zombies that Chalmers imagines, though it must be noted that these are not the lively flesh-eating chaps we see in the movies.

The real problem, of course, is with p2: conceivability is not a reliable guide to possibility. I can conceive of impossible things, such as the idea of squaring the circle, or of a god that is omnipotent and yet can make a mountain so big that she couldn’t move it, and so on. Chalmers comes up with an (admittedly ingenious) little story, and we are supposed to deduce from it the momentous conclusion that there is more than matter/energy to the universe? When things appear to be too good to be true there is often good reason to think that they in fact are too good to be true.

Moreover, although this is an unstated implication of the above deduction, possibility in turn is not a particularly good guide to reality. There are plenty of things that are possible but that are not in fact realized in the actual world. Remember that the question that Chalmers wishes to answer is whether human mental experience is compatible with materialism, as is strongly suggested by the fact that nobody has ever seen a mental state occur independently of the presence of a physical brain (what some philosophers call the “no ectoplasm clause”). While I think it is very reasonable to assume that anything that is real must also be possible (either that or our logic is seriously faulty), it is just bizarre to suggest that one can go from possibility to claims about reality, the way Chalmers does. Has he not learned anything from the failure of the rationalist program in philosophy?

Incidentally, I would note that mine (or Hanrahan’s, from what I can tell) is not an argument against thought experiments in general. They can be useful to evaluate our intuitions, and — contrary to popular belief — they are not just something that “armchair philosophers” (a redundant phrase if there ever was one) engage in. Scientists from Galileo to Einstein have used thought experiments to sharpen their thinking about the world. But just like any tool, it needs to be used according to reasonable instructions and to solve the appropriate problems, just because all you’ve got is a hammer that doesn’t turn everything into a nail.

As readers of this blog know, I am a scientist with a background in philosophy, and am very sympathetic to the whole philosophical approach to things. But just in the same way I think a lot of scientists do a disservice to themselves and to the public by not taking philosophy seriously, I am also convinced that people like Chalmers don’t help philosophy even a bit, either among scientists or the public. Let’s relegate zombies to B-movies and try to be a little more serious about our philosophy, shall we?