I'm sincerely struggling to interpret your last post in a rational way, or to find any argument for the existence of mind in molecules. — Daemon
I can offer you an argument more explicitly than I have done so far.
Consciousness does not admit of degree
All process or functions admit of degree
Therefore consciousness cannot be a process or function.
Every emergentist theory of consciousness I have come across associates consciousness with some kind of gradually emergent process or function. I can't improve on that, I can't think of a plausible emergentist theory that finds some binary event in nature and says 'That's where consciousness emerges'. Even if it did, there would still be the question "OK, but why can't that happen without consciousness? What is it about that that necessitates an experience?"
So, if we reject emergentist theories, we're left with
either eliminativism (consciousness doesn't exist, at least in the sense given in this argument)
or panpsychism (consciousness was around at the start and is likely in everything in some way, if we can make sense of it). Eliminativism is clearly false, therefore we are left with panpsychism.
But when we see them trip over the paving stone, we don't say "it was because the centre of gravity was too far forward, but there must also be a psychological explanation". — Daemon
I'm happy with mechanical explanations with regard to medium sized objects, where those explanations are useful and give us the information we want, as in your example. We don't need to question the exact nature of gravity for the explanation (or description) to be useful. But if we want to know what gravity is, or the nuclear forces, or magnetism, then we don't have mechanistic explanations for these field-like influences, because they do not have internal parts that mesh with each other, we can't break them down further, as far as I know anyway. We just say, well, these forces describe how matter behaves when in their influence. Some physicists might be realist about these forces, and say that they are more than just descriptions of how stuff behaves, I don't know. Anyway, the panpsychist has a problem. What role does consciousness play in the behaviour of matter at this foundational level, if any? Are we going to be epiphenomenalist about the consciousness of an atom or molecule, but not when it comes to humans and other brainy animals? Where exactly does consciousness start being causal? And when is it just a added extra that doesn't do anything (epiphenomenalism)? My talk of the consciousness of non-brainy things is an attempt to make sense of this. I'm trying to be a responsible panpsychist and actually try to tackle these questions. So the panpsychist has to attach consciousness somewhere, and the best fit seems to be at the fundamental level of field forces, it seems to me. (Tononi and Koch attach it to systems that integrate information, which makes them panpsychist, but that doesn't commit them to will in the same way that I am committed to will.) I'm suggesting, for maximum consistency, that consciousness is causal from humans all the way down to atoms and field forces. That's the simpler theoretical approach to take, and that's what I am exploring. The reason I have to do this is because panpsychism
must be true in some way or another, because we
know (I suggest) that eliminativism and emergentism is false, and these are the only alternatives. Am I entirely comfortable talking about the will of atoms? No, not really. It's a bit weird, I grant you, but necessary. I have to follow the logic. And it's not actually incoherent, at least to my mind.
So back to the paving slab (good example by the way), I agree with you that we are not looking for a psychological explanation in this case. What I'm trying to do is resolve arguments about the causal closure of the physical. The way I do it here, and the way I inject psychological causes in is not at the macro level, but at the level of fields, perhaps. The mechanistic explanation is still correct enough at the macro level, but it is reducible, I suggest, to psychological explanations at the micro level. We have a reduction of the mechanical to the psychological. By analogy, we could look at the behaviour of whole populations. Individuals do what they do because of how they feel. But on aggregate, we can describe their behaviour in quantitative terms perfectly accurately, without ever mentioning their psychological motivations, and forget that psychology was ever a part of the explanation. Nevertheless, the psychology is there in the background driving the macro-level behaviour on aggregate. With the paving slab example, I'm suggesting that psychology makes a difference at the fundamental level. Without consciousness causing things to happen at the micro-level, nothing would happen at the macro level, I suggest. Indeed the macro-level would not exist at all, if we consider that particles are persistent behaviours of fields.
But the ultimate motivation for panpsychism, as
@I like sushi has correctly explained, is that it is the result of a struggle with the question of the place of consciousness in nature, and the conclusion is (rightly or wrongly) that it is everywhere, in some sense. For me, this is by process of elimination - it's the only theory of consciousness that doesn't have fatal objections.