Full context:   Freud conceptualised the structural model because it allowed for a greater degree of precision and diversification. While the need contents of the id are initially unconscious (can become unconscious again as a result of an act of repression), the contents of the ego (such as thinking, perception) and the superego (memory; imprinting) can be both conscious and unconscious. Freud argued that his new model included the option of scientifically describing the structure and functions of the mentally healthy living being and therefore represented an effective diagnostic tool for clarifying the causes of mental disorders: Transference neuroses correspond to a conflict between the ego and the id; narcissistic neuroses, to a conflict between the ego and the superego; and psychoses, to one between the ego and the external world.