Id, ego, and super-ego

In his later work, Freud proposed that the psyche could be divided into three parts: ego, super-ego, and id. Freud discussed this model in the 1920 essay Beyond the Pleasure Principle, and fully elaborated upon it in The Ego and the Id (1923), in which he developed it as an alternative to his previous topographic schema (i.e., conscious, unconscious, and preconscious). The id is the impulsive, child-like portion of the psyche that operates on the "pleasure principle" and only takes into account what it wants and disregards all consequences. Freud acknowledged that his use of the term Id (das Es, "the It") derives from the writings of Georg Groddeck. The term Id appears in the earliest writing of Boris Sidis, in which it is attributed to William James, as early as 1898. The super-ego is the moral component of the psyche, which takes into account no special circumstances in which the morally right thing may not be right for a given situation. The rational ego attempts to exact a balance between the impractical hedonism of the id and the equally impractical moralism of the super-ego; it is the part of the psyche that is, usually, reflected most directly in a person's actions. When overburdened or threatened by its tasks, it may employ defense mechanisms including denial, repression, and displacement. The theory of ego defense mechanisms has received empirical validation,^[37] and the nature of repression, in particular, became one of the more fiercely debated areas of psychology in the 1990s.^[38]

I learned something new today.... :)

Id, ego, and super-ego are the three parts of the "psychic apparatus" defined in Sigmund Freud's structural model of the psyche; they are the three theoretical constructs in terms of whose activity and interaction mental life is described. According to this model, the uncoordinated instinctual trends are the "id"; the organized realistic part of the psyche is the "ego," and the critical and moralizing function the "super-ego." ^[1]

Even though the model is "structural" and makes reference to an "apparatus", the id, ego, and super-ego are functions of the mind rather than parts of the brain and do not necessarily correspond one-to-one with actual somatic structures of the kind dealt with by neuroscience.

The concepts themselves arose at a late stage in the development of Freud's thought: the structural model was first discussed in his 1920 essay "Beyond the Pleasure Principle" and was formalized and elaborated upon three years later in his "The Ego and the Id." Freud's proposal was influenced by the ambiguity of the term "unconscious" and its many conflicting uses.

The terms "id," "ego," and "super-ego" are not Freud's own but are latinisations originating from his translator James Strachey. Freud himself wrote of "das Es," "das Ich," and "das Über-Ich"—respectively, "the It," "the I," and the "Over-I" (or "Upper-I"); thus to the German reader, Freud's original terms are more or less self-explanatory. The term "das Es" was borrowed from Georg Groddeck, a German physician to whose unconventional ideas Freud was much attracted.^[2] (Groddeck's translators render the term in English as 'the It').

Read more in wikipedia