Oedipus scorn of her mom. The psychoanalytic mainstream Among Freud's mainstream followers, Otto Fenichel highlighted the displacement of affect, either through postponement or by redirection, or both. More broadly, he considered that "in part the paths of displacement depend on the nature of the drives that are warded off". Freud's daughter, Anna Freud, also played an important role in the upbringing of these defense mechanisms by the twentieth century. She introduced and analyzed ten of her own defense mechanisms and her work has been used and increased through the years by newer psychoanalysts. Eric Berne in his first, psychoanalytic work, maintained that "some of the most interesting and socially useful displacements of libido occur when both the aim and the object are partial substitutions for the biological aim and object...sublimation". Lacan In 1957, psychoanalyst Jacques Lacan, inspired by an article by linguist Roman Jakobson on metaphor and metonymy, argued that the unconscious has the structure of a language, linking displacement to the poetic function of metonymy, and condensation to that of metaphor. As Lacan put it, "in the case of , 'displacement', the German term is closer to the idea of that veering off of signification that we see in metonymy, and which from its first appearance in Freud is represented as the most appropriate means used by the unconscious to foil censorship". Aggression Within the Freudian psychoanalytic framework, the aggressive drives may be displaced in a similar manner to the libidinal drives. Business or athletic competition, or hunting, for instance, may offer opportunities for the expression of displaced aggression. In such scapegoating behavior, aggression may be displaced onto items or people with little to no connection to the cause of the aggressors frustration. Displacement can also act in what looks like a 'chain-reaction,' with people unwittingly becoming both victims and perpetrators of displacement. For example, a man is angry with his boss, but he cannot express this properly, so he hits his wife. The wife, in turn, hits one of the children, possibly disguising this as a "punishment." (rationalization) Ego psychology sought to use displacement in child rearing, a dummy being used as a displaced target for toddler sibling rivalry. With a purpose to apprehend how the ego uses defense mechanisms, it is important to apprehend the defense mechanisms themselves and the way they function. A few defense mechanisms are visible as protecting us from the internal impulses (e.g.,