n.
or subconscious
In psychoanalysis , the part of the psychic apparatus that does not ordinarily enter the individual's awareness but may be manifested by slips of the tongue, dreams , or neurotic symptoms (see neurosis ).
The existence of unconscious mental activities was first elaborated by Sigmund Freud and is now a well-established principle of psychiatry . The origin of many neurotic symptoms is said to depend on conflicts that have been removed from consciousness by repression and maintained in the unconscious through various defense mechanisms . Recent biopsychological explorations have shed light on the relationship between brain physiology and the levels of consciousness at which people retain memories.