ConradDJ said:
I'm just not grasping what you mean by "free will", I guess. What exactly is it that "there's no room for", whether the universe is deterministic or not?
The evidence strongly suggests that at the quantum level, when systems interact, new information gets created. Decisions get made that are dependent on a context of prior conditions, but not uniquely "determined" by them.
One point still missing in these discussions is Pattee's epistemic cut which distinguishes between rate dependent dynamics (all the deterministic/probablistic action down at the physical level) and rate independent information (a "something else", that is not physically determined, and whose actual status is a little hard to speak about).
Now physical determinism claims that the world is composed of atomistic events following fixed rules (holonomic boundary conditions). At the Newtonian level, there is no choice. Mass and energy fix the course of every particle in block universe style.
So this is why we get so many arguing that even brains are deterministic devices. It is physics all the way up with no room for anything different than rate dependent dynamics.
But Pattee's point is about computational devices. About symbolic processing.
Something changes when you have a set of switches that can change state "at no cost". Or rather, all at exactly the same cost. Suddenly mass and energy and even spacetime drop out of the picture as physically, the cost of coding any bit of information becomes the same. So the only causes determining the action become symbolic one, computational ones.
We are completely out of the Newtonian paradigm where you can look at the physics and say this caused that to happen. If every event is zeroed to have the same energetic cost, then there are no Newtonian causes visible to explain what is happening.
This is what we have with a computer, a Turing machine. There is a complete divorce of hardware and software. The hardware don't know what the software is doing. The state of the machine may change, but this is not determined by the physics of the machine, purely by the patterns conjured up by the software. The symbols and their rules are determining the action. The physical machine becomes so irrelevant that a Turing machine can be implemented on any suitable "tape and gate" handling structure.
Now life and mind use this "computational" trick in a variety of grades to create the complexity that gives them autonomy, choice, memory, identity, a "subjective POV". They do literally remove a part of themselves from the brute deterministic flow of Newtonian physics by creating this computational back-story - a private realm of memory and habits and intentions. The non-holonomic constraints that Pattee talks about.
And obvious rate independent device is DNA. Energetically, it cost the same to code for any combination of codons, and hence for DNA to represent any kind of protein. Remembering a protein becomes a free choice for the genes. They can chose this one, or that one, and it is all the same in the end so far as Newtonian mechanics goes. The choice becomes purely a private or subjective one. If it suits the organism, it will remember that protein instead of the millions of alternative choices it could have made with equal ease.
Of course, having made a choice, that does have deterministic consequences of a kind. The genes are pretty computational and will manufacture that protein under the right combination of external circumstances. So when the Newtonian world of rate dependent dynamics is sensed to have reached some critical point, the genes will pump out some enzyme to control that reaction, shut it down, speed it up. Change the boundary conditions that prevail so that the metabolic activity self-organises into a new state.
Yet the genes can make new choices. There is also a further informational machinery to evolve their state. Sexual reproduction makes use of randomness - gaussian or constrained to a single scale randomness, so still quite constrained - to mix the protein recipes about. A computational shuffling of the deck that is cost-free in terms of energetics (and so why it can be properly "random"). Then the shuffled deck is thrown back into the Newtonian fray - the organism goes through life and there is differential breeding success that updates the information represented by the gene pool.
So with genes, and sex, we can see the dance between the two realms - the Newtonian fray which is "completely determined" according to Kim, Q Goest, and others, a closed causal tale, and then the private realm of symbols and rules that is, in principle, absolutely free to play its own games.
The same with words. It costs us as much to say peanut as universe. Each is just a puff of air, a quick effort by our throat muscles. The symbolic weight of the words may be hugely different, but there are no Newtonian constraints acting on the words we chose to utter. The ideas they represent can be as small or large, general or particular, vague or crisp, as we like.
As a Vygotskean aside, it should thus be obvious why the human invention of speech created a rapid mental revolution. The thinking of animals is still energetically constrained. They can easily think about whatever is present (the way their brains are organised, they have no choice), but they have no free machinery for thinking about things that are not present. Without symbols to shuffle ideas about "at no cost", the thoughts of animals are reality-constrained. Every idea is having to pay for itself in terms of how it is serving the immediate demands of the moment - brains existing to balance energy needs against energy opportunities in terms of current behaviours.
So when it comes to talking about Newtonian determinism, the whole point about life is that it arose by finding a way to beat the game. It discovered computational mechanism - a symbolic determinism that could stand apart from the physical determinism. That is a new level that was itself undetermined, but could invent/evolve its own world of rule-based action.
So forget QM or even non-linear dynamics. Newtonian determinism just cannot touch a computational realm of action. Once the Newtonian cost of representing symbols and executing rules has been zeroed, then Newtonian determinism can no longer choose between states of representation. That choice becomes a purely internal one.
Of course in practice, the two levels of action are in interaction. There is no point having a symbolic capacity except to serve the purpose of controlling the Newtonian fray. Well, that is how it works for life and mind. Actual computers could not care because there really is no interaction between their software realm and their hardware realm. But for life and mind - complex adaptive systems - there is an active interaction that makes all the activity meaningful. The system has a memory, a history, goals, intentions, plans.
This does not tell you what freewill is (freewill is a human social construct, wrapped around a brain's ability to make intelligent choices based on general goals) but it should convince that Newtonian determinism cannot determine the patterns playing out at the level of software. The symbols and their rules are literally out of sight so far as that level of physical description goes.