[The Structure of Mental Apparatus]
Our two hypotheses start out from these ends or beginnings of our knowledge. The first is concerned with localization. We assume that mental life is the
function of an apparatus to which we ascribe the characteristics of being extended in space and of being made up of several portions - which we imagine, that is, as resembling a telescope or microscope or something of
the kind. Notwithstanding some earlier attempts in the same direction, the consistent working-out of a conception such as this is a scientific novelty.
We have arrived at our knowledge of this psychical apparatus by
studying the individual development of human beings. To the oldest of these psychical provinces or agencies we give the name of id. It contains everything that is inherited, that is present
at birth, that is laid down in the constitution - above all, therefore, the instincts, which originate from the somatic organization and which find a first psychical expression here in forms unknown to us.(1)
Under the influence of the real external world around us, one portion of the id has undergone a special development. From what was originally a cortical
layer, equipped with the organs for receiving stimuli and with arrangements for acting as a protective shield against stimuli, a special organization has arisen which henceforward acts as an intermediary between the id
and the external world. To this region of our mind we have given the name of ego.
Here are the principal characteristics of the ego. In consequence of the pre-established connection between sense perception and
muscular action, the ego has voluntary movement at its command. It has the task of self-preservation. As regards external events, it performs that task by becoming aware of stimuli, by storing up experiences about them
(in the memory), by avoiding excessively strong stimuli (through flight), by dealing with moderate stimuli (through adaptation) and finally by learning to bring about expedient changes in the external world to its own
advantage (through activity). As regards internal events, in relation to the id, it performs that task by gaining control over the demands of the instincts, by deciding whether they are to be allowed satisfaction, by
postponing that satisfaction to times and circumstances favourable in the external world or by suppressing their excitations entirely. It is guided in its activity by consideration of the tensions produced by stimuli,
whether these tensions are present in it or introduced into it. The raising of these tensions is in general felt as unpleasure and their lowering as pleasure. It is probable, however, that what is felt as pleasure or
unpleasure is not the absolute height of this tension but something in the rhythm of the changes in them. The ego strives after pleasure and seeks to avoid unpleasure. An increase in unpleasure that is expected and
foreseen is met by a signal of anxiety; the occasion of such an increase, whether it threatens from without or within, is known as a danger. From time to time the ego gives up its connection with the external world and
withdraws into the state of sleep, in which it makes far-reaching changes in its organization. It is to be inferred from the state of sleep that this organization consists in a particular distribution of mental energy.
The long period of childhood, during which the growing human being lives in dependence on his parents, leaves behind it as a precipitate the formation in his ego of a special agency in which this parental influence is
prolonged. It has received the name of super-ego. In so far as this super-ego is differentiated from the ego or is opposed to it, it constitutes a third power which the ego must take into account.
An action by the ego
is as it should be if it satisfies simultaneously the demands of the id, of the super-ego and of reality - that is to say, if it is able to reconcile their demands with one another. The details of the relation between
the ego and the super-ego become completely intelligible when they are traced back to the child's attitude to its parents. This parental influence of course includes in its operation not only the personalities of the
actual parents but also the family, racial and national traditions handed on through them, as well as the demands of the immediate social milieu which they represent. In the same way, the super-ego, in the course of an
individual's development, receives contributions from later successors and substitutes of his parents, such as teachers and models in public life of admired social ideals. It will be observed that, for all their
fundamental difference, the id and the super-ego have one thing in common: they both represent the influences of the past - the id the influence of heredity, the super-ego the influence, essentially, of what is taken
over from other people - whereas the ego is principally determined by the individual's own experience, that is by accidental and contemporary events.
This general schematic picture of a psychical apparatus may be
supposed to apply as well to the higher animals which resemble man mentally. A super-ego must be presumed to be present wherever, as is the case with man, there is a long period of dependence in childhood. A distinction
between ego and id is an unavoidable assumption. Animal psychology has not yet taken in hand the interesting problem which is here presented. (From Sigmund Freud: An Outline of Psychoanalysis, 1940.)
Notes:1. This oldest portion of the psychical apparatus remains the most important throughout life; moreover,
the investigations of psycho-analysis started with it.
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