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 unconscious guilt. Freud believed that the Oedipal sentiment has been inherited through the millions of years it took for humans to evolve from apes. He based this on his analysis of his feelings attending the play, his anecdotal observations of neurotic or normal children, and on the fact that " Oedipus Rex" was effective on both ancient and modern audiences. (He also claimed that the play "Hamlet" "has its roots in the same soil as "Oedipus Rex"", and that the differences between the two plays are revealing. "In ["Oedipus Rex"] the child’s wishful fantasy that underlies it is brought into