There is no I that is separate from your physical body. There is an I. It is made of cells. That is what chooses. The process of choosing is a physical/chemical/electrical/whatever process. This process = choice.
If we are a meat machine and the process is bound by cause and effect, the laws of the physical universe,
what makes the choice? If the result is inevitable, where is a choice made? Can a proton choose whether or not to cross a membrane? Can a synapse choose whether or not to fire? The process may be what we call choice, and it looks like choice or will because the input is too complicated and the wiring too little understood to make predictions or anticipate the outcome, but seriously, where is there true option, under some kind of conscious control, at any step of that process?
btw, I don't think we can predict from input to output, and don't know that we ever will be able to. Remember when you get down to the atomic level, you're dealing with quanta, which can never be fully predicted or accounted for. There is a certain amount of fuzziness/probability there.
Even if it pans out that due to quantum mechanics there is fuzziness that translates to randomness in chemical reactions (now wow - that's going to blow the mind of a lot of chemists!), there is no 'tiny invisible man' sorting out the random events, shuttling the ones he likes into the process - is there? Where is the conscious control there?
It turns out that brain "wiring" changes constantly, as it is used, and one way to change it is to change what you think and what you think about.
Exactly. How is that wiring changed? - By the sensory input it receives. Let me say that again. How is that wiring changed? - By the sensory input it receives. See, you read that sentence twice and now that neural network is stronger than if I just typed it once.
If there is no "I" there is no "you" to consciously change what you think and what you think about. "You" are a meat machine, bound by the laws of cause and effect.
I don't think you can say the output is inevitable. I don't know if I said this before, but for me ontology always reduces to epistemology.
Yes, you said that and I see the practicality in that. Seriously, I'm not sure what else we have.
We can know someone's genetic heritage, know a lot about their life experience, and still not be able to predict perfectly what they will believe.
Our inability to predict just means that there are too many variables, many of them unknown, and the machinery is just too complex. And as we just discussed above, the machinery changes as it is used.
OTOH, and I think this is important, we can make a lot of predictions, if we know those things. We can see patterns. For example, if I know that you were born in Sana'a to Muslim parents, and have never left Yemen, are female and not educated beyond 6th grade, I can predict with a fairly high degree of accuracy that you are Muslim, Shi'ite and wears niqab or equivalent. Just for an example.
Yes, we can make a lot of predictions about behavior because of the dependability of cause and effect, although human choices are one of the areas where we are most in the dark.
Does she have free will? Why is she less likely to wear her head uncovered and worship Jesus? Etc.
I don't think we've yet addressed how any meat machine can have will, free or otherwise.
There is an I. It is made of meat.
I am going by the idea that we are fully meat machines. I put "I" and "you" in quote marks when I am trying to get at exactly what it is that chooses anything, at any level.