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==Sigmund Freud==
According to [[Freud]], the [[pleasure principle]] is one of the "two principles of mental functioning" -- in addition to the [[reality principle]].
According to [[Freud]], the [[pleasure principle]] is one of the "two principles of mental functioning" -- the other being the [[reality principle]].
The [[pleasure principle]] aims exclusively at obtaining pleasure and avoiding unpleasure.
Unpleasure is related to the increase of quantities of excitation.
(and plesure to their reduction_
The latter results from increased excitation.
The [[pleasure principle]] therefore serves to reduce tension and to return the [[psyche]] to a state of equilibrium or constancy.
