beanybag said:
So what if we have free will and therefore possesses the ability to take a different action than we otherwise would have? We only ever end up taking one - it's functionally deterministic (not taking into account relativity, quantum uncertainty, and observer perspectives). And further, why would we take a different action? I take the actions I take because they are the ones I choose based on reason, conditioning, past experiences.. everything that makes me myself.
Broadly speaking, freewill boils down to the claim we can make conscious choices. We can always imagine doing otherwise.
If you trace the origins of the idea, you can see in the early days it was the realisation that individuals could do something other than their societies or base desires might demand. The reasoning mind could rise above two kinds of unthinking prompts for action.
This was turned into a dualistic religious deal. The source of this now absolute freedom to chose came from a soul.
Then it became a monistic scientific illusion. Newtonian mechanics reduced all causality to atomistic action and so it seemed any naturalistic account of consciousness or reasoning must be micro-deterministic. Outcomes are already fixed by their initial conditions.
So we go from a mild claim - we can make reasoned choices - to an opposing pair of extreme claims, an immaterial cause guarantees free choice vs material cause forbids actual choice.
As you say, the way out of this bind is just to accept that causes are hierarchical. There are macro-level causes (reason, conditioning, past experiences) that functionally determine our choices - or indeed, are responsible for shaping the fact of choice in the first place.
If you insist on viewing the issue of choice through a Newtonian microscope, the only causation you can see are the micro-circumstances of some present moment. It is how all your molecules are at some instant that "completely determines" the next instant - and every further instant to the end of time.
But if you step back to see the wider view, then you can see that the reasoning brain is having its choices "determined" by past experience, conditioning, etc, and having its actual choice "determined" by some anticipation of future results. So the initial conditions driving some moment of action indeed have a macro-extent, reaching both into a remembered past and a predicted future.
Newtonian particles of course do not enjoy this kind of extended, memory/expectation based view of the world so it is irrelevant to their modelling. But some notion of macro-scale causation is essential for the modelling of more complex systems like brains.
At this point, scientific fundamentalists will again want to insist that macro-causes still reduce completely to micro-causes. But this remains a hollow claim unless the micro-view can actually show us how to construct the kind of global "emergent" states that constitute a memory/expectation based process of conscious reasoning and choice.
Compare for example any attempt to model human choice in terms of molecular motions and game theory -
http://en.wikipedia.org/wiki/Game_theory
One demands infinite information - an unlimited number of measurements - because it has no way of fixing the higher level constraints. The other comes up with elegant and simple formulae by directly modelling those constraints.
The freewill debate has heat mainly because scientists get drawn into defending a strong ontological position - that all causality is local effective cause, Newtonian determinism. But science is really about modelling the world. It might be guided by certain ontological intuitions at times, but these are dispensable.
That is what distinguishes science. It becomes the art of the measurable rather than the defence of the immeasurable (whether that be immaterial souls, or the kinds of material descriptions of nature that would require infinite measurements).