Psychoanalytical criticism uses theories of psychology to analyze literature by focusing on the author's state of mind or the mind of fictional characters. It originated from Sigmund Freud's theories about the id, ego, and superego that make up the human mind. Freudian critics examine works for unconscious motives, feelings, and classic psychoanalytic symptoms. Carl Jung expanded on this to look at collective unconscious themes and universal symbols manifested in literature. Harold Bloom applies Freudian concepts like repression to literary history, arguing poets unconsciously rewrite predecessors while struggling with anxiety of influence.