Free Will might be nothing more than a trick the brain plays on itself
blogs.scientificamerican.com
blogs.scientificamerican.com
Suppose there are nonphysical entities (whatever that means) that interact with the physical world (for example to control our bodies). Either those interactions follow some set of laws of nonphysics and are deterministic (or maybe stochastic), in which case free will has the same problems it has under materialism, or they are nondeterministic/random, in which case does that qualify as free will?
Does an AI need to feel in control? What kind of role can an illusion of choice have in reinforcement learning? Wouldn't it introduce errors on smaller time scales, e.g. when catching a ball? Or in building up procedural memory in general?
The problem is we have no satisfactorily logical and coherent case for explaining how a human agent exerts controlling causality on itself and the space around it through time. Because of this, most attempts at defending/arguing the existence of free will typically hinges on altering the definition of freedom that must be obtained in willing, an effort to carve out a defensible position that looks like free will, but is a rather amusing game of endlessly moving the goal posts toward a compatible definition of freedom.
For compatibilists, this pretty much always turns into a logical playground of arguing that being able to do otherwise would be the case if some increasingly creative number of things about oneself had been different. Peter van Inwagen's replays-by-god are a pretty amusing example here. Compatibilists accept causal determinism outside the human agent, but seek to carve out a space within for the human agent to will and act freely.[1]
Incompatibilists, naturally, reject the notion that freedom and causal determination can co-exist. So they typically argue over a number of varying-strength propositions that seem to more often accept agent freedom as a given, but causality as the thing worth arguing over.
For some time yet, I imagine we will continue to argue over and shift the lines of where the human will may be considered the causal source of human action. But I don't think we're ever likely to come up with a definitive argument that is intelligible enough to be satisfactory.[2]
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[1]: There are, of course, some who like to differentiate between acting and willing freely, of course.
[2]: I can't help but wonder where this conversation would be if we hadn't had many intervening centuries of religious dominance in various human endeavors, including philosophy, that sent us on centuries of building gods into our arguments, and then subsequently taking gods back out and winding up nowhere closer to a decision. Well, maybe a bit closer, but we're still dealing with the implications of gods on human will and action in the 21st century.