It began, of course, with Freud. Psychoanalysis refers both to a theory of how the mind works and a treatment modality. In recent years, both have yielded to more mainstream, research-driven approaches, but psychoanalysis is still a thriving field.
Belief in the primacy of the unconscious fantasy, sexual desires (libido, penis envy, Oedipal complex), and dreams has wavered. But Freud also identified such basic mental maneuvers as transference, projection, and defensiveness, and demonstrated how they distort our functioning. As a treatment based on extended self-exploration, psychoanalysis has evolved beyond the silent-shrink stereotype.