People are information processing systems and is determined by the mental interpretation of exposure. Psychodynamic: driven by dark forces of the unconscious mind. Influence of self concept, perception, interpersonal relationships, and need for growth. The body and brain enables human behavior. Behavior is determined by neural structures and brain chemistry. Developmental: we go through developmental stages of life that shape our behavior. Skinner agreed with watson that behavior is controlled by external factors. Organisms tend to repeat positive responses not negative responses. Humanist agreed that psychology was dehumanizing and that they only focused on animal behavior. Humanists emphasize on qualities such as human growth and free will. Carl rogers and maslow thought that humanism is based on self concept. In wwii psychology became a clinical profession. Empirical- the premise of knowledge is based on experimentation. It is theoretically diverse-- no single theory solves the problem. Experience of emotion is physiological responses to emotion arousing stimuli.