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> [W]hile electron positions are unpredictable, molecular reactions, the sort that happen in the human brain are pretty predictable. Basically, my response to this is "That would be relevant if we had black holes or large hadron colliders in our heads, but we don't, so...".

What about those quantum effects that have recently been shown to potentially be part of brain activity:

https://www.sciencedaily.com/releases/2014/01/140116085105.h...

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You could make the same argument to say that your PC adding 2+2 is indeterminate because it has the same underlay of supposed random quantum behavior. But at our material level, the world is pretty deterministic just as your PC or phone adding 2+2 is. And as far as neuroscience has gathered, quantum randomness hasn't affected it enough for those scientists to think it's non-deterministic, or else they wouldn't have a job.

Quantum effects are part of brain activity because they underly all electrochemistry--that's never been in question. The question is whether those quantum effects impart any non-determinism to the brain system, and the link you posted doesn't make any claims that they do or don't.

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