Freud described changes in the structure of the mind, including the consolidation of the superego with resolution of the oedipal complex. Important psychoanalytic thinkers since Freud have studied and emphasized the role of pre-oedipal development in the creation of psychological structure. While each of these authors developed his or her own language and concepts, they all described a fundamental transition in the structure and working of the mind that has profound importance for the psyc...