Terry, I agree completely with your devastating observation that the mind is affected by alzhiemers, drugs, trauma, etc.. Fortune's responses are totally inconsistent with all of our experience with "mind" as we know it. When we do something to the physical brain we will most likely alter its manifestations in consciousness. Both of you, however, ignore the point I've made about the ultimate nature of Reality . It is fundamentally something of the nature of Mind. Not mind as we experience it, but it is a kind of Intelligence and Consciousness, but not as we experience it. We are micro and culturally refracted expressions of universal Intelligence and Consciousness. We can't imagine that a rock is conscious or that Nature is intelligent when the rock just lies there and nature it generates gross mutations and Down Syndrome. I can't either. I DO feel, however, that at the most microlevel nature of the rock and all "things" there is (fundamentally as it were) a form of Mind. And the universal intelligence (manifested in part in the regularities of Nature, as we know it) goes beyond OUR conception of what is a rational organization of Nature. At the very least do keep in mind that this very discussion of the primacy of the physical, i.e., brain over consciousness, is a conscious experience. Our discussion about, even our belief in the primacy of the physical, is a form of Minding.
It took me years to understand Buddhism's principle that at bottom all is Mind. In order to grasp this principle I had to cease equating Mind with mind. Man is the measure of all things, but only within our human realm. There is a Universal Realm where our True Mind lives. We ARE the Cosmos, and our little human world is an expression of it, but we must not identify ourselves ONLY with that human world. To identify with the Cosmic Mind is the nature of true Religion, and it has nothing to do with beliefs, faith and Morality; it has to do with insight and joy.
I realize that my perspective is no more consistent with your experience tha is that of Fortune. That's unfortunate. But I'm sure Fortune would make the same lament. It's all a matter of perspective.