The paradox of modern neuroscience is that the one reality you can't describe as it is presently conceived is the only reality we'll ever know, which is the subjective first person view of things. Even if you can find the circuit of cells that gives rise to that, and you can construct a good causal demonstration that you knock out these circuit of cells, and you create a zombie; even if you do that... and I know Dennett could dismantle this argument very, very quickly ... there's still a mystery that persists, and this is the old mind-body problem, but it’s an old problem for a reason: we don't simply feel like three pounds of meat.