In this paper we analyzed the reason for psychology being a disunified theory unlike classical mechanics. We tried to improve the structure of information processing theory by adding a new organ, mental screen, and shown another memory device designed according to a new principle. We introduced three new scientific concepts, mental representation, mental operation and mental force, to describe status of human mental behavior. These three quantities are all vectors as they having magnitude and type and two of them have object. Finally, we built relationships between mental operation and mental force and take them as core equations for psychology to show reason about mental status.

unified theory, reductionism, information processing, cognitive psychology, mental representations