Does anyone know a mechanistic, physical theory of the process of thinking? It seems to involve observation - emotion and so much more, that I have no handle on it. The only theories I have heard are not physical but involve some spiritual or quantum tunneling out of spacetime and into a nether world of Hilbert possibility. These are usually (and probably rightfully) decried as pseudoscience. Also, besides the process of thinking, which I'm "thinking" of as analogious to the envelope, what can be said about the thought itself, i.e. the content of the letter?