Assuming materialism; I'm making this thread because I cannot understand the position that free will exists under materialism. There are a very large number of these philosophers and neuroscientists, I've read all (or most of) their arguments, and they've yet to show exactly where the Shroedinger equation breaks down in the brain, or where the laws of thermodynamics break down, etc. I cannot understand how so many of them believe in free will under physicalism? Please, someone elucidate their position and exactly where the laws of physics breaks down in a complex system, I'm starting to go insane here. I mean, the answer to me seems pretty straightforward: 1) Given that we have 0 reason to suppose that a complex system leads to the breakdown in physical law, and 2) Given that we have 0 reason to suppose that the brain can direct where the collapsed wave-particle to discrete-state "lands", A) If collapse is determined, future brain states if modeled alongside environment are predictable, in principle [or perhaps not, but nevertheless], with 100% accuracy (you will think what you think no matter what). B) If collapse is truly stochastic, the probability distribution of future brain states if modeled alongside environment is predictable, in principle [or maybe not even in principle, but this doesn't change the thought experiment], with 100% accuracy (i.e. you would have AT BEST random will). Q.E.D., right??? Or wrong? I know that there exist some people that argue against 1). How? Do they have a reason to do so? And yes, apeiron, I have considered global~local, but this doesn't lead to a breakdown in physical law! A river's flow can still be predicted by modeling every particle in the water, banks of the river, stones in the river, etc. Does anyone understand why there are a huge number of materialist compatibilists/libertarians, and where exactly they've found a circumvention to the above? I'm sure if I'm wrong, it'll have to do with my knowledge of physics, which makes this place a good place to post this question. When I'm talking about free will, I'm talking about the free will notion that the average guy has on the street, the ability to "do otherwise".