I think it is a claim, not an argument, really (one I do happen to agree with); essentially that if we had good enough neuroscience we could find the sensation of green in the cells, signals, or whatever.

There’s something in those cells and signals that is having the first-person perspective of being me, which is experiencing the sensation of green. I believe that the matter is all there is, so it must be in there somewhere. But for example if it is in the carbon, I wonder why we haven’t found it when we look very hard at pencil lead? I mean, that’s getting way ahead of ourselves, we don’t really know how to characterize it at all other than by this one very odd thing that it seems to do.