Free will: where does the buck stop?
When you typed your sentence were you using your brain and nervous system to process your actions? Did you have a reason for typing the sentence, or was it a random sentence? I don't believe you had a free choice in what you wrote, your choice was determined by the specific activation weights and thresholds in your nerve cells as your sensory signals propagate through the system. At every step of the chain reaction the laws of physics determine the outcome. A choice is simply a causal chain reaction in your nervous system that weighs many factors that you are unconscious of. All of this is "coerced", even though you don't feel coerced; the whole process is perfectly natural. The reason you don't feel coerced is because there is nothing outside the laws of physics that can make it feel coerced; it's perfectly natural in that sense.
He is his brain and nervous system, though. So if his choice was determined by the specific activation weights and thresholds in his nerve cells as his sensory signals propagate through the system, then his choice was determined entirely by him.
The debate succumbs to a category error as soon as we start abstracting the self into different ways of being, like the conscious and unconscious, mind/brain and body, and apply selfhood to one aspect and not the other. It results in something so convoluted that it is a strange wonder why anyone even bothers.
If a being is capable of willing then it must be true of the entire being. If a being is not capable of willing then his actions must be determined by something else. Why do we limit the will to a tiny and arbitrary subset of actions but not to all of them, from the most obvious to the most hidden? He wills the blood to move just as much as he wills his arm to move, as he always does and must do, with the entirety of his living being. In any case, refusing to abstract the self in such a schizophrenic way makes the debate much simpler, in my opinion. Whatever action a human being performs is determined, decided, and chosen by that being; and until an action can be shown to be determined by anything else in the universe he has free will. No appeals to “laws of physics” and other metaphors need be invoked.