QM is irrelevant. To say that aspects of our behaviour are intrinsically random is just as much to explain it as strict determinism.
Do you mean "random" or "probabilistic"?
We've been over this before, Ian, you have to distinguish between "random", which most people use to mean "completely random", or "probabilistic" which does not necessarily mean completely random, especially when a system has memory, as drkitten brings up now:
Internal states? You mean mental states? I'm going to assume you do so mean this.
So, we have a system with some probabilistic elements, some internal states, and some probabilities of transitions between states.
Do you see, yet, why this completely dismembers your argument?
Furthermore, it shows that QM is utterly germane to the issue, and germane to determinism. Random does not mean "predetermined", after all.
Physical state of organism? Well, I include that as part of the environment. But let me rephrase it. "It is only necessary that we are familiar with physical laws and the state of the environment, and the physical state of the organism in order to predict behaviour.
Again, you're wrong. QM implies a probabilistic component to anything whatsoever made of material. Ergo, you can not predict behavior as you assert.
And it is different for humans? This is the problem. You're talking about some knowledge existing over and above physical facts. This is a direct contradiction to materialism.
Please show me some evidence that humans are anything but wetware. There is neither evidence nor need for anything above and beyond "physical facts", they just aren't the facts you want them to be, Ian.
I agree. But it's not relevant to the point I made I'm afraid. Such internal states are not the real cause of our behaviour,
"proof" by blatant assertion, I think.
otherwise you're not talking about reductive materialism.
I won't speak for drkitten, who quite capably speaks for herself, but I will point out that "reductive materialism" now a creeping bar, and you're trying to shift the bar from materalism to "reductive materialism".
Internal states of the brain exist, physically, and have been shown to exist. Ergo, any physical theory has to account for that. Whatever it is you're talking about can't be part of physical theory unless it acknowledges these physical states that have been measured (although their meaning is not clear or trivially decoded), and accounts for them.
In short, you're proposing something incommensurate with observation and then trying to put it in the mouth of something that can't possibly assert it.
You have to maintain it's the correlates of mental states which is causally efficacious, not the mental states themselves.
No, Ian, I don't.
Right, so you've refuted materialism. That's the implication.