Changes

===Definition===

As an ''adjective'', it simply refers to ''mental processes'' that are not the [[subject]] of [[conscious]] attention at a given moment.

As a ''noun'', it designates one of the ''psychical systems'' which [[Freud]] described in his first theory of [[psyche|mental]] [[structure]] (the "[[unconscious|topographical model]]").

According to this theory, the [[psyche|mind]] is divided into three systems or "psychical localities," the [[conscious]] ('''Cs'''), the [[preconscious]] ('''Pcs''') and the [[unconscious]] ('''Ucs''').

The [[unconscious|unconscious system]] is not merely that which is ''outside'' the field of [[consciousness]] at a given time, but that which has been radically [[separation|separated]] from [[consciousness]] by [[repression]] and thus cannot enter the [[conscious|conscious-preconscious system]] without [[distortion]].

In [[Freud]]'s second theory of [[mental]] [[structure]] (the "[[structural theory]]"), the [[mind]] is divided into the three "agencies" of [[ego]], [[superego]] and [[id]].