Freud's seduction theory emphasizes the causative impact of nurture: the shaping of the mind by experience. This theory held that hysteria and obsessional neurosis are caused by repressed memories of infantile sexual abuse. Infantile sexual abuse, the root of all neurosis, is premature introduction of sexuality into the experience of the child. Trauma creates affects and thoughts that simply cannot be integrated. The adult who had a normal, non traumatic childhood is able to contain and assimilate sexual feelings into a continuous sense of self. Freud proposed that adults who experienced sexual abuse as a child suffer from unconscious memories and feelings incompatible with the central mass of thoughts and feelings that constitute his or her experience. Psychic disorders are a direct consequence of experiences that cannot be assimilated. Unconscious memories of infantile sexual abuse was a necessary condition for the development of certain disorders, hysteria in particular. But another condition had to be met: There had to be an unconscious memory of the abuse.