Object relations theory is a school of thought in psychoanalytic theory centered around theories of stages of ego development. Its concerns include the relation of the psyche to others in childhood and the exploration of relationships between external people, as well as internal images and the relations found in them. Thinkers of the school maintain that the infant's relationship with the mother primarily determines the formation of its personality in adult life. Particularly, attachment is the bedrock of the development of the self or the psychic organization that creates the sense of identity.