Sigmund Freud founded psychoanalysis, which emphasizes the influence of the unconscious mind on behavior. Psychoanalysis treats mental disorders by recognizing the relationship between the conscious and unconscious minds. According to psychoanalysis, people's behavior is largely influenced by their unconscious drives from early childhood. The human mind is composed of the id, ego, and superego - the id contains primal urges, the ego balances id urges with reality, and the superego contains internalized morals from parents and society. Major thinkers who expanded on psychoanalysis include Anna Freud, Erik Erikson, and Carl Jung.