Is Free Will an Illusion?

[Jim__]

43. Massimo Pigliucci's free will roundtable.

There is a link at this site to a 90 minute video.

An excerpt of some of Pigliucci's thoughts:

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Let’s take a brief look at some of the above claims, starting with the issue of determinism. The best that neuroscience can do is to show that behavior X is neurally correlated with activity in brain structure Y. This has precisely nothing to do with determinism because non-deterministic effects could be present at much more physically fundamental levels than those dealt with by neuroscience and never show up on the neuroscientist’s radar. That’s why determinism is really an issue for physics. And let’s clear the air about oft-repeated claim (most recently by Alex Rosenberg, in an awful book that I’m currently reviewing for The Philosopher Magazine) that physics has shown determinism to be true. Au contraire, mon ami, physics has, once and probably for all, shown determinism to be wrong, via of course quantum mechanics. Before the good reader’s ire leads him straight to the comments section of this post, let me be clear that I know perfectly well that random quantum events do not rescue naive conceptions of free will (because randomness is not at all the same thing as deliberative decision making). But the fact remains that the best of modern physics shows us that determinism is not of this world — you are free (so to speak) to draw your own metaphysical conclusions from that bit of science, as long as you keep in mind that it ain’t neuro-science.

What about Libet’s experiments? You know, the one showing that people make unconscious decisions about when to push a button hundreds of milliseconds (according to more recent evidence, even several seconds) before they become aware of having made the decision? I always thought this was a strange way to attack either free will or consciousness, and my panelists readily agreed. First off, Libet-type experiments are conducted by telling subjects to push a button when “they feel the urge rising.” This is hardly the sort of deliberative reflection we associate with human volition, so it’s not testing anything like “free will.” Second, it would be truly surprising if a lot of decisions were not actually made by our unconscious. Indeed, we know this is the case, for instance for all automated tasks (driving a car, hitting a baseball), and we know why: conscious reflection would be too slow in most of those cases, sometimes potentially costing us our lives. Third, it is simply bizarre to think of my unconscious decisions as “not really mine.” Whose are they, then? “I” am not just the conscious processing of information and awareness of that processing, “I” am also my distributed cognition at all levels of my nervous system, including unconscious processing of information. If you disagree, this means that most of the times you are not actually driving your car, your inner zombie is (did he also decide where to go?).

Now to the much talked about fMRI data. Let’s set aside the well acknowledged (by neuroscientists) fact that this is still a very blunt instrument, that it doesn’t really measure brain activity (only oxygen consumption by brain cells, used as a proxy for brain activity), and that it is still next to impossible to carry out the scans in real time (those beautiful pictures of brains “doing” this or that are actually sophisticated statistical composites of various individuals) and in realistic situations. At the moment, all that an fMRI scan can establish is that there is a correlation between activity X and oxygen consumption by brain area Y. That’s it. While this is much better than we could do until a few years ago, and while Lau at the roundtable cautiously explained how this sort of information may help us discriminate among some functional hypotheses, it is a far cry from the sort of claims that are made these days on the basis of fMRI research.

To begin with, of course, just remember the old mantra: correlation is not causation. Correlations may be spurious or the result of a third, as yet unmeasured process, that is affecting both correlates. Moreover, even if we could establish causality, this would constitute only a very partial explanation for whatever it is that is going on. Take, for instance, the much talked about fMRI of people immersed in deep prayer. They do show that certain areas of the brain are preferentially involved in that activity. But then again, how could it be otherwise? Everything we think or do has to pass through some sort of neural signal after all. What the fMRI cannot tell us is whether, say, the mental state induced by deep prayer (or meditation) indicates a reduced proprioception (which would explain in entirely materialistic terms the sense of expanded consciousness and detachment from one’s own body that sometimes accompany the experience), or the fact that subjects are actually accessing a non-material realm, just as they claim they are, based on their phenomenological experience. Indeed, it isn’t even clear what sort of evidence could discriminate between the two “hypotheses” (just for the record, yes, I do think the second possibility doesn’t have a prayer — ah! — of being true).


more ... ( http://rationallyspeaking.blogspot.com/2011/11/free-will-roundtable.html )

Here's more from Pigliucci about the complexities involved with the issue of determinism ( http://rationallyspeaking.blogspot.com/2011/12/handy-dandy-guide-for-skeptic-of.html )