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From the standpoint of physics, I had merely introduced into my brain a small collection of foreign particles. But that change was enough to eliminate the familiar impression that I freely control the activities playing out in my mind. While the reductionist-level template remained in full force (particles governed by physical laws), the human-level template (a reliable mind endowed with free will navigating through a stable reality) was upended. Of course, I am not presenting a mind-altering moment as an argument for or against free will. But the experience made visceral an understanding that would otherwise have remained abstract. Our sense of who we are, the capacities we have, and the freedom of will we seemingly exert all emerge from the particles moving through our heads. Fiddle with the particles, and those familiar qualities can fall away. It’s an experience that helped align my rational grasp of the physics with my intuitive sense of the mind.
Everyday experience and everyday language are filled with references, implicit and explicit, to free will. We speak of making choices and coming to decisions. We speak of actions that depend on those decisions. We speak of the implications that these actions have on our lives and the lives of those we touch. Again, our discussion of free will does not imply that these descriptions are meaningless or need to be eliminated. These descriptions are told in the language appropriate to the human-level story. We do make choices. We do come to decisions. We do undertake actions. And those actions do have implications. All of this is real. But because the human-level story must be compatible with the reductionist account, we need to refine our language and assumptions. We need to set aside the notion that our choices and decisions and actions have their ultimate origin within each of us, that they are brought into being by our independent agencies, that they emerge from deliberations that stand beyond the reach of physical law. We need to recognize that although the sensation of free will is real, the capacity to exert free will—the capacity for the human mind to transcend the laws that control physical progression—is not. If we reinterpret “free will” to mean this sensation, then our human-level stories become compatible with the reductionist account. And together with the shift in emphasis from ultimate origin to liberated behavior, we can embrace an unassailable and far-reaching variety of human freedom.
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Brian Greene (Until the End of Time: Mind, Matter, and Our Search for Meaning in an Evolving Universe)