In Freudian psychoanalysis, the pleasure principle (Lustprinzip) is the instinctive seeking of pleasure and avoiding of pain to satisfy biological and psychological needs. Specifically, the pleasure principle is the animating force behind the id.
Epicurus in the ancient world, and later Jeremy Bentham, laid stress upon the role of pleasure in directing human life, the latter stating: "Nature has placed mankind under the governance of two sovereign masters, pain and pleasure".
Freud's most immediate predecessor and guide however was Gustav Theodor Fechner and his psychophysics.
Freud used the idea that the mind seeks pleasure and avoids pain in his Project for a Scientific Psychology of 1895, as well as in the theoretical portion of The Interpretation of Dreams of 1900, where he termed it the 'unpleasure principle'.
In the Two Principles of Mental Functioning of 1911, contrasting it with the reality principle, Freud spoke for the first time of "the pleasure-unpleasure principle, or more shortly the pleasure principle". In 1923, linking the pleasure principle to the libido he described it as the watchman over life; and in Civilization and Its Discontents of 1930 he still considered that "what decides the purpose of life is simply the programme of the pleasure principle".
While on occasion Freud wrote of the near omnipotence of the pleasure principle in mental life, elsewhere he referred more cautiously to the mind's strong (but not always fulfilled) tendency towards the pleasure principle.
Freud contrasted the pleasure principle with the counterpart concept of the reality principle, which describes the capacity to defer gratification of a desire when circumstantial reality disallows its immediate gratification. In infancy and early childhood, the id rules behavior by obeying only the pleasure principle. People at that age only seek immediate gratification, aiming to satisfy cravings such as hunger and thirst, and at later ages the id seeks out sex.
Maturity is learning to endure the pain of deferred gratification.
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Repression is a key concept of psychoanalysis, where it is understood as a defense mechanism that "ensures that what is unacceptable to the conscious mind, and would if recalled arouse anxiety, is prevented from entering into it." According to psychoanalytic theory, repression plays a major role in many mental illnesses, and in the psyche of the average person. American psychologists began to attempt to study repression in the experimental laboratory around 1930.
Ego psychology is a school of psychoanalysis rooted in Sigmund Freud's structural id-ego-superego model of the mind. An individual interacts with the external world as well as responds to internal forces. Many psychoanalysts use a theoretical construct called the ego to explain how that is done through various ego functions. Adherents of ego psychology focus on the ego's normal and pathological development, its management of libidinal and aggressive impulses, and its adaptation to reality.
In classical Freudian psychoanalytic theory, the death drive (Todestrieb) is the drive toward death and destruction, often expressed through behaviors such as aggression, repetition compulsion, and self-destructiveness. It was originally proposed by Sabina Spielrein in her paper "Destruction as the Cause of Coming Into Being" (Die Destruktion als Ursache des Werdens) in 1912, which was then taken up by Sigmund Freud in 1920 in Beyond the Pleasure Principle.
In the Freudian theory of the psychical apparatus, the introduction from the 1920s onward of the second drive dualism appears as a major turning point. The idea of a "death drive," first expressed in Beyond the Pleasure Principle (Freud, 1920), is generall ...