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[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
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. Notes: -- <=
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