First of all, I'm going to be arrogant and solipsistic in my approach to understanding Free Will. This is a personal feature every human has, whether it's "real" or a delusion or illusion. At this point, I don't see enough consensus out there, except for the Godidit talking point that "God gave us Free WIll". (Bullcrap! I mean, even if God did didit, we're still stuck with the "science" of understanding how it works. Even if God left us billion year old fossils six thousand years ago, He still left it up to us to understand what He gave us as best we can, and solve our own human problems. Fine, so worship The Maker. But we still have to cure diseases and build shelter from natural disasters, and... oh-oh, I felt an uncontrollable rant ramping up inside me, but decided I should stop it.) So...
Free Will is one of those things that hasn't been scientifically defined yet, just as we are still defining and trying to understand consciousness. We'll be able to define it better and better over time, but I'll bet it will always be mostly a philosophical discussion rather than scientific. Why? Because the question will always come down to whether I as a human being can be separate from the Me as a meat body. The brain is where it is (i.e. where I is), at least in this lifetime, and while I'm writing this, so any other entertainment of this question has to consider whether or not I can exist without my body. That question will always lead to a religious, spiritual, or indeed even an arrogant and solipsistic soliloquy or conversation.
So what really matters to each of us regarding this question about Free Will? 1) What each of us experiences inside, ala qualia. 2) How can or does our persoanl definition of Free Will jive with everyone else's.
This is so much like any discussion about religion, isn't it? In fact, I'll go so far as to admit that what I believe about Free Will is not much more valid than any faith. I believe that the qualia I cannot exist separate from meat Me, and therefore my behavior in the strictest definition of the term is predetermined. However, here I am, feeling unquestionably that my behavior is pure choice. It feels like I'm making my free choices, albeit only in the context of what's possible in reality. I.e., I can't decide to fly like a bird, but I can decide whether or not to put a period at the end of this sentence
Furthermore, we are social beings, as are most animals, but even more than most animals. I cannot even define myself without the context of other humans, or you readers. My selfish, arrogant definition of Free Will is also in that context. What you do can affect me, and what I do can affect you. Our Free Wills, or whatever we should call this interactive, group aspect of it feels just as real, and just as valid as my personal, isolated Free Will, no matter how stubborn I am about what I believe, and no matter how each of us defines these things. I can exist solitary on an island somewhere, but I'll never be able to exist without knowledge of the larger context of humanity.
I want to write more, but maybe this is a good place to stop and simmer for a while? I won't even proofread until later. Any and all contributions from the rest of my reality (i.e. you people) will be appreciated. I think I wanted to talk about new research wrt scientific measurments wrt neurological timing of personal decision making, or similar, but I haven't read enough about it yet. I suspect it won't ultimately add much insight into the real question, which is about mind/matter duality, other to confirm that there is no duality... and in that sense, I'm not sure I care how much science confirms what I already believe. Yes, that's arrogance! And perhaps faith in its own way, I think, but I'm still ultimately open to new observations even if they argue against my current view.