You don’t really exist, do you?

by Massimo Pigliucci

www.universaltheory.org

For some time I have been noticing the emergence of a strange trinity of beliefs among my fellow skeptics and freethinkers: an increasing number of them, it seems, don’t believe that they can make decisions (the free will debate), don’t believe that they have moral responsibility (because they don’t have free will, or because morality is relative — take your pick), and they don’t even believe that they exist as conscious beings because, you know, consciousness is an illusion.

As I have argued recently, there are sensible ways to understand human volition (a much less metaphysically loaded and more sensible term than free will) within a lawful universe (Sean Carroll agrees and, interestingly, so does my sometime opponent Eliezer Yudkowsky). I also devoted an entire series on this blog to a better understanding of what morality is, how it works, and why it ain’t relative (within the domain of social beings capable of self-reflection). Let’s talk about consciousness then.

The oft-heard claim that consciousness is an illusion is an extraordinary one, as it relegates to an entirely epiphenomenal status what is arguably the most distinctive characteristic of human beings, the very thing that seems to shape and give meaning to our lives, and presumably one of the major outcome of millions of years of evolution pushing for a larger brain equipped with powerful frontal lobes capable to carry out reasoning and deliberation.

Still, if science tells us that consciousness is an illusion, we must bow to that pronouncement and move on (though we apparently cannot escape the illusion, partly because we have no free will). But what is the extraordinary evidence for this extraordinary claim? To begin with, there are studies of (very few) “split brain” patients which seem to indicate that the two hemispheres of the brain — once separated — display independent consciousness (under experimental circumstances), to the point that they may even try to make the left and right sides of the body act antagonistically to each other.

But there are a couple of obvious issues here that block an easy jump from observations on those patients to grand conclusions about the illusoriness of consciousness. First off, the two hemispheres are still conscious, so at best we have evidence that consciousness is divisible, not that it is an illusion (and that subdivision presumably can proceed no further than n=2). Second, these are highly pathological situations, and though they certainly tell us something interesting about the functioning of the brain, they are informative mostly about what happens when the brain does not function. As a crude analogy, imagine sawing a car in two, noticing that the front wheels now spin independently of the rear wheels, and concluding that the synchronous rotation of the wheels in the intact car is an “illusion.” Not a good inference, is it?

Let’s pursue this illusion thing a bit further. Sometimes people also argue that physics tells us that the way we perceive the world is also an illusion. After all, apparently solid objects like tables are made of quarks and the forces that bind them together, and since that’s the fundamental level of reality (well, unless you accept string theory) then clearly our senses are mistaken.

But our senses are not mistaken at all, they simply function at the (biologically) appropriate level of perception of reality. We are macroscopic objects and need to navigate the world as such. It would be highly inconvenient if we could somehow perceive quantum level phenomena directly, and in a very strong sense the solidity of a table is not an illusion at all. It is rather an emergent property of matter that our evolved senses exploit to allow us to sit down and have a nice meal at that table without worrying about the zillions of subnuclear interactions going on about it all the time.

What about the neurobiological research that seems to show quite conclusively that consciousness is just a post-facto add-on to our decision making? Don’t we know that “we” don’t actually make our decisions, that it’s all going on subconsciously?

To begin with, I find it bizarre to talk as if unconscious thinking isn’t part of what “we” do. Who else is doing it? “We” are made of our conscious and unconscious processing of information, of our bodies, and of our interactions with the social and physical world. That’s who “we” are, and to limit the definition of “we” to just the conscious part is misguided.

Moreover, a closer look at the evidence does not bear out the increasingly persistent myth that “it’s all unconscious anyway.” Here very interesting work has been done by Alfred Mele at Florida State University. In his Effective Intentions: The Power of Conscious Will, Mele critically examines claims to the effect that, for instance, our brains make decisions before we become conscious of them, or that intentions don’t play a role in producing actions. He finds the evidence for such extraordinary claims extraordinarily deficient and — to the contrary — lines up evidence from neurobiology for the conclusion that consciousness plays a major role in (some, most certainly not all) of our decisions, particularly when it comes to the sort of decisions we normally do attribute to conscious deliberation (like whether to change career, say, not just when to push a button on a computer screen, a la Libet experiments).

One more thing strikes me as strange from the point of view of the “consciousness is an illusion” school of thought. Its supporters have no account of why this illusion would evolve. If we take seriously the commonsensical idea that consciousness aids deliberative reasoning, then we see that it has a (important) biological function. But if it is just an illusion, what’s it for? Now, as a biologist I am perfectly aware that sometimes in evolution shit just happens (“spandrels,” as Stephen Gould and Richard Lewontin referred to structures that seem adaptive but are in fact byproducts of evolution). But if a large amount of metabolic energy used up by the brain goes into maintaining the illusion of consciousness surely one wants an answer to the question of why did natural selection bring this situation about or — if consciousness is a spandrel — why does it persist in the face of what should be strong selection against it. We know that when organisms don’t need complex structures/functions natural selection quickly eliminates them (for instance, in the case of eyes for cave animals).

It won’t do to claim that the illusion of consciousness is there because that way we feel in control and suffer less psychological stress. First, this is clearly an ad hoc and hard to test hypothesis (the evolutionary part of it, not the psychological: we do know that people become stressed by perceived lack of control). Second, the problem is only removed by one step: why would we evolve a psychological system that causes stress when we perceive a loss of control? Most other animal species seem to get along in life just well without these psychological mechanisms, so clearly something is missing from the “illusion” account.

Seems to me, therefore, that the increasingly fashionable idea that consciousness is an illusion is both too quick and not actually supported by a careful reading of the neurobiological literature, and skeptics and freethinkers would do well to pause and reflect on it before continuing to spread it. Of course that assumes that you can reflect on things in a way that is conducive to decisions implementing what your conscious will wants to do.