Oedipus complex desire (libido) for mother, and aggression towards father, student–collaborator Carl Jung counter-proposed that girls experienced desire for father and aggression towards mother via the Electra complex—derived from the 5th-century BC Greek mythologic character Electra, who plotted matricidal revenge with Orestes, her brother, against Clytemnestra, their mother, and Aegisthus, their stepfather, for their murder of Agamemnon, her father (cf. "Electra", by Sophocles). Moreover, because it is native to Freudian psychology, orthodox Jungian psychology uses the term "Oedipus complex" only to denote a boy's psychosexual development. In classical Freudian psychology the super-ego, "the heir to the Oedipus complex", is formed as the
Oedipus complex recognition has become the "shibboleth" that distinguishes the adherents of psychoanalysis from its opponents"; thereby it remained a theoretic cornerstone of psychoanalysis until about 1930, when psychoanalysts began investigating the pre-Oedipal son–mother relationship within the theory of psychosexual development. Janet Malcolm reports that by the late 20th century, to the object relations psychology "avant-garde, the events of the Oedipal period are pallid and inconsequential, in comparison with the cliff-hanging psychodramas of infancy. ... For Kohut, as for Winnicott and Balint, the Oedipus complex is an irrelevance in the treatment of severe pathology". Nonetheless, ego psychology continued to maintain that "the