Archaic is the term used in psychoanalysis to refer to an aspect of the psyche that was organized in the distant past and which contrasts with a new or more evolved organization. The term is used in two specific senses. For Freud the term served essentially to refer to a phylogenetic heritage that involved a way of thinking (1933a [1932]), the requirement of a superego (1923b), or an anxiety associated directly with a prehistoric reality. Freud's theoretical advances did not affect the nature of the archaic understood in this sense. For Melanie Klein the archaic increasingly refers to that which is not reworked by the development of the depressive position, becoming a synonym of sorts for the pregenital.