…to emphasize its epochal character; The Interpretation of Dreams), he presented his findings. Interspersing evidence from his own dreams with evidence from those recounted in his clinical practice, Freud contended that dreams played a fundamental role in the psychic economy. The mind’s energy—which Freud called libido and identified principally, but…

… introduced the concept in his Interpretation of Dreams (1899). The term derives from the Theban hero Oedipus of Greek legend, who unknowingly slew his father and married his mother; its female analogue, the Electra complex, is named for another mythological figure, who helped slay her mother.

In his Die Traumdeutung (1899; The Interpretation of Dreams) he posited a phenomenon called the Oedipus complex, that is, the male child’s repressed desire for his mother and a corresponding wish to supplant his father. (The equivalent for girls was the Electra complex.) According to Freud, this phenomenon was detectable…

Among Freud’s earliest writings was The Interpretation of Dreams (1899), in which he insisted that dreams are “the royal road to knowledge of activities of the unconscious mind”—in other words, that dreams offer a means of understanding waking experience. He held this theory throughout his career, even mentioning it in…