Psychology is the “study of mind and behavior.” The Twentieth Century saw the advent of concepts like behaviorism (study of observable and measurable behaviors) as well as the interpretation of dreams as the desires/fears of the subconscious. With the science of psychology beginning to take shape as a quantifiable, rather than mystical and abstract science, there could be more focus on the what drives people to do what they do. Rhetorical practices used to persuade and convince could make use of the knowledge of what motivates humans. This is especially true in the Twentieth Century, in which there is an emphasis on the observable in both disciplines.