Will Bouwman wrote: ↑Mon Jul 29, 2024 6:09 am
Immanuel Can wrote: ↑Sun Jul 28, 2024 10:34 pm
Will Bouwman wrote: ↑Sun Jul 28, 2024 10:13 pm
How would we live differently if some kind of dualism were not true?
Like Physicalism?
You wouldn't be arguing with me, or arguing at all. For then, my opinion at any given moment would always be 100% the product of prior physical causes, not of rational beliefs of any kind...
How would your opinion be different?
Given Physicalism, there is actually no "opinion," and it can't be "different" from whatever it is. It's predetermined by the physical causes, and cannot be the product of non-physical things like rational persuasion, or recognition of evidence, or understanding of demonstration, or whatever. Those can only be stations through which the causal train flew without stopping or picking up anything.
Immanuel Can wrote: ↑Sun Jul 28, 2024 10:34 pmHave we some assurance in advance that physical causes can
only produce true beliefs?
The only assurance we have is that however we come by our beliefs, there is no guarantee of truth.
It's not even a case of "guarantee," as if we have some rationale to suppose that any of our beliefs are ever keyed to favour truth at all. Rather, all beliefs are nothing more than the product of physical causes that are utterly unconcerned about truth or falsehood either way. That turns everything...even the hardest of the sciences, into nothing more than a crap-shoot: if the scientist happened to fall into the right physical pre-conditions for a true belief, he got one; if he didn't, he didn't...but because error is much easier than truth, the chances were stacked against the belief being true, and if it was, it was only an accident that it was. In fact "true" becomes nothing more than a synonym for "accidental." As for reasoning, evidence, proof, demonstration...all had nothing whatsoever to do with which physical preconditions were in play, making it possible for the scientist to believe or disbelieve whatever he concluded.
What I'm trying to make clear to you, Will, is that you've dismissed the faculty which is supposed to mediate this. Beliefs, in my view, start with impressions or ideas or physical options we have, and then are processed by the mind for plausibility, rationality, validity, relation to intended goals, and so forth. The belief and then the behaviour that ensues is the product of our options being "filtered" in this way, so to speak, though a consciousness held by a person with a specific identity and wishes, aiming at a personal choice. Mind, person, choice, freedom, will, identity, volition, reasoning, reaction, goals...all these are a location of the instigation of consequent causal chains. They are responding to the range of options available within the noted physical limitations, but they are not predetermined by them.
And that's exactly how we all live: as if, when we choose something, there's actually a "we" who is making a "choice" which will change the outcome of what happens in the world, within the limits of our physical powers. Nobody lives as if he/she decides nothing, fatalistically resigned to whatever outcomes the physical-causal chains happen to cough up. But that's what Physicalism would suggest we should do...if Physicalism were true.
But mind, choice, volition, reason, science, will, consciousness, inclination, personhood, identity, logic... are all things that Physicalism would reduce to nothing but byproducts of physical pre-causes, without any actual contribution to make to the final belief.
Against this, I'd suggest that our beliefs and choices are mediated by
mind...which Physicalists would have to call "only brain responding to physical signals induced by non-cognitive causes," and could not regard as a real determiner of anything at all, without thereby ceasing to be rationally-consistent Physicalists.