Wilhelm Wundt established the first psychology laboratory in 1879 at the University of Leipzig, formally defining psychology as the study of conscious experiences. He developed structuralism, which focused on the fundamental elements of thinking, consciousness, and emotions. Sigmund Freud specialized in nervous disorders and developed psychoanalysis to study the unconscious mind and how unconscious conflicts influence behavior. Alfred Adler broke from Freud to focus on individual psychology and how people differ in their behaviors. John Watson rejected early approaches and established behaviorism, defining psychology as the objective scientific study of observable behaviors.