As I can't sleep, I'm taking the opportunity to post some material here that I mentioned earlier that relates to the materialism question a bit more. It's from Putnam's 'Philosophy and Our Mental Life'. I've been looking into functionalism recently, and as far as I can make it out, I don't believe it works.
There's a question about whether functionalism is Aristotelian. Putnam seems to suggest that it is. I've read an essay by John Nelson recently saying that it isn't. In any case, at the moment I find Aristotle's account of the soul unsatisfactory and for similar reasons to why I find functionalism unsatisfactory.
For me, some of the reason I find them unsatisfactory can be explained via things like the 'Flying Man' thought experiment:
https://aeon.co/ideas/what-can-avicenna-teach-us-about-the-mind-body-problem
Anyway, enough of that. I will let Putnam speak:
"If it is built into one's notion of the soul that the soul can do things that violate the laws of physics, then I admit I am stumped. There cannot be a soul which is isomorphic to a brain, if the soul can read the future clairvoyantly, in a way that is not in any way explainable by physical law. On the other hand, if one is interested in more modest forms of magic like telepathy, it seems to me that there is no reason in principle why we couldn't construct a device which would project subvocalised thoughts from one brain to another. As to reincarnation, if we are, as I am urging, a certain kind of functional structure (my identity is, as it were, my functional structure), there seems to be in principle no reason why that could not be reproduced after a thousand years or a million years or a billion years. Resurrection: as you know, Christians believe in resurrection in the flesh, which completely bypasses the need for an immaterial vehicle. So even if one is interested in those questions (and they are not my concern in this paper, although I am concerned to speak to people who have those concerns), even then one doesn't need an immaterial brain or soul-stuff.
"So if I am right, and the question of matter or soul-stuff is really irrelevant to any question of philosophical or religious significance, why so much attention to it, why so much heat? The crux of the matter seems to be that both the Diderots of this world and the Descartes of this world have agreed that if we are matter, then there is a physical explanation for how we behave, disappointing or exciting. I think the traditional dualist says '
wouldn't it be terrible if we turned out to be just matter, for then there is a physical explanation for everything we do.' And the traditional materialist says '
if we are just matter, then there is a physical explanation for everything we do. Isn't that exciting!' (It is like the distinction between the optimist and the pessimist: an optimist is a person who says 'this is the best of all possible worlds'; and a pessimist is a person who says 'you're right'.)
"I think they are both wrong. I think Diderot and Descartes were both wrong in assuming that if we are matter, or our souls are material, then there is a physical explanation for our behaviour."