Electra complex classical psychoanalytic theory, the child's identification with the same-sex parent is the successful resolution of the Electra complex and of the Oedipus complex; his and her key psychological experience to developing a mature sexual role and identity. Sigmund Freud instead proposed that girls and boys resolved their complexes differently—she via penis envy, he via castration anxiety; and that unsuccessful resolutions might lead to neurosis. Hence, women and men who are fixated in the Electra and Oedipal stages of their psychosexual development might be considered "father-fixated" and "mother-fixated". As a psychoanalytic term for daughter–mother psychosexual conflict, the Electra complex derives from
Oedipus complex "disappointment over a woman" (object drives) or "a mishap in social relations with other men" (ego drives) is the cause of regression or symptom formation. Triangulation can take place with a romantic rival, for a woman, or with a work rival, for the reputation of being more potent. When Sigmund Freud (1856–1939) proposed that the Oedipus complex was psychologically universal, he provoked the evolution of Freudian psychology and the psychoanalytic treatment method, by collaborators and competitors alike. In countering Freud's proposal that the psychosexual development of boys and girls is equal, i.e. equally oriented – that each initially experiences sexual