The Psychodynamic Approach Model Definition. The approach that  concentrated on the unconscious forces that drive our behavior; belief that the inner forces over which individuals have little control motivate behavior. • Founded by Sigmund Freud, the most influential figure in the history of psychology. • The basis of motivation and behavior lies in inner forces; forces that are predetermined, and forces over which humans have little control, which the person is not aware of i.e., unconscious determinants of behavior • It maintained that instincts are the driving force ...