That's odd. Why would they expect anything to act linearly? Of course there's a chaotic variance inherent in brain functions. That's a fundamental mandate in life. He noted the need for unpredictable escape patterns; in humans, this additionally manifests as the ability to be creative.
But I've asked people to discuss chaos theory in reference to free will before and no one seemed interested or no one knows anything. I don't know enough about fractals or the chaos mathematics in general to look at things from that perspective.
Still, as he says, it's not a question of science. The debate over free will is a philosophical one, and so necessarily begins in the definition, not in any kind of empirical knowledge. If I define "gravity" to refer to the likelihood of people to make connections with people who are dour and ill-humored, the theory of gravity would probably be disproven pretty damn quickly, since people tend to dislike dour people, and wouldn't make connections with them.
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