Does consciousness always and essentially involve self-consciousness, or consciousness-of-consciousness, as Brentano, Husserl, and Sartre held (in verying detail)? If so, then every act of consciousness either includes or is adjoined by a consciousness-of-that-consciousness. Does that self-consciousness take the form of an internal self-monitoring? If so, is that monitoring of a higher order, where each act of consciousness is joined by a further mental act monitoring the base act? Or is such monitoring of the same order as the base act, a proper part of the act without which the act would not be conscious?