Thus there was required a second activity—in our terminology the activity of a second system—which should not permit the memory occupation to advance to perception and therefrom to restrict the psychic forces, but should lead the excitement emanating from the craving stimulus by a devious path over the spontaneous motility which ultimately should so change the outer world as to allow the real perception of the object of gratification to take place. Thus far we have elaborated the plan of the psychic apparatus; these two systems are the germ of the Unc. and Forec, which we include in the fully developed apparatus.
In order to be in a position successfully to change the outer world through the motility, there is required the accumulation of a large sum of experiences in the memory systems as well as a manifold fixation of the relations which are evoked in this memory material by different end-presentations. We now proceed further with our assumption. The manifold activity of the second system, tentatively sending forth and retracting energy, must on the one hand have full command over all memory material, but on the other hand it would be a superfluous expenditure for it to send to the individual mental paths large quantities of energy which would thus flow off to no purpose, diminishing the quantity available for the transformation of the outer world. In the interests of expediency I therefore postulate that the second system succeeds in maintaining the greater part of the occupation energy in a dormant state and in using but a small portion for the purposes of displacement. The mechanism of these processes is entirely unknown to me; any one who wishes to follow up these ideas must try to find the physical analogies and prepare the way for a demonstration of the process of motion in the stimulation of the neuron. I merely hold to the idea that the activity of the first Ψ-system is directed to the free outflow of the quantities of excitement, and that the second system brings about an inhibition of this outflow through the energies emanating from it, i.e. it produces a transformation into dormant energy, probably by raising the level. I therefore assume that under the control of the second system as compared with the first, the course of the excitement is bound to entirely different mechanical conditions. After the second system has finished its tentative mental work, it removes the inhibition and congestion of the excitements and allows these excitements to flow off to the motility.
An interesting train of thought now presents itself if we consider the relations of this inhibition of discharge by the second system to the regulation through the principle of pain. Let us now seek the counterpart of the primary feeling of gratification, namely, the objective feeling of fear. A perceptive stimulus acts on the primitive apparatus, becoming the source of a painful emotion. This will then be followed by irregular motor manifestations until one of these withdraws the apparatus from perception and at the same time from pain, but on the reappearance of the perception this manifestation will immediately repeat itself (perhaps as a movement of flight) until the perception has again disappeared. But there will here remain no tendency again to occupy the perception of the source of pain in the form of an hallucination or in any other form. On the contrary, there will be a tendency in the primary apparatus to abandon the painful memory picture as soon as it is in any way awakened, as the overflow of its excitement would surely produce (more precisely, begin to produce) pain. The deviation from memory, which is but a repetition of the former flight from perception, is facilitated also by the fact that, unlike perception, memory does not possess sufficient quality to excite consciousness and thereby to attract to itself new energy. This easy and regularly occurring deviation of the psychic process from the former painful memory presents to us the model and the first example of psychic repression. As is generally known, much of this deviation from the painful, much of the behavior of the ostrich, can be readily demonstrated even in the normal psychic life of adults.
By virtue of the principle of pain the first system is therefore altogether incapable of introducing anything unpleasant into the mental associations. The system cannot do anything but wish. If this remained so the mental activity of the second system, which should have at its disposal all the memories stored up by experiences, would be hindered. But two ways are now opened: the work of the second system either frees itself completely from the principle of pain and continues its course, paying no heed to the painful reminiscence, or it contrives to occupy the painful memory in such a manner as to preclude the liberation of pain. We may reject the first possibility, as the principle of pain also manifests itself as a regulator for the emotional discharge of the second system; we are, therefore, directed to the second possibility, namely, that this system occupies a reminiscence in such a manner as to inhibit its discharge and hence, also, to inhibit the discharge comparable to a motor innervation for the development of pain. Thus from two starting points we are led to the hypothesis that occupation through the second system is at the same time an inhibition for the emotional discharge, viz. from a consideration of the principle of pain and from the principle of the smallest expenditure of innervation. Let us, however, keep to the fact—this is the key to the theory of repression—that the second system is capable of occupying an idea only when it is in position to check the development of pain emanating from it. Whatever withdraws itself from this inhibition also remains inaccessible for the second system and would soon be abandoned by virtue of the principle of pain. The inhibition of pain, however, need not be complete; it must be permitted to begin, as it indicates to the second system the nature of the memory and possibly its defective adaptation for the purpose sought by the mind.
The psychic process which is admitted by the first system only I shall now call the primary process; and the one resulting from the inhibition of the second system I shall call the secondary process. I show by another point for what purpose the second system is obliged to correct the primary process. The primary process strives for a discharge of the excitement in order to establish a perception identity with the sum of excitement thus gathered; the secondary process has abandoned this intention and undertaken instead the task of bringing about a thought identity. All thinking is only a circuitous path from the memory of gratification taken as an end-presentation to the identical occupation of the same memory, which is again to be attained on the track of the motor experiences. The state of thinking must take an interest in the connecting paths between the presentations without allowing itself to be misled by their intensities. But it is obvious that condensations and intermediate or compromise formations occurring in the presentations impede the attainment of this end-identity; by substituting one idea for the other they deviate from the path which otherwise would have been continued from the original idea. Such processes are therefore carefully avoided in the secondary thinking. Nor is it difficult to understand that the principle of pain also impedes the progress of the mental stream in its pursuit of the thought identity, though, indeed, it offers to the mental stream the most important points of departure. Hence the tendency of the thinking process must be to free itself more and more from exclusive adjustment by the principle of pain, and through the working of the mind to restrict the affective development to that minimum which is necessary as a signal. This refinement of the activity must have been attained through a recent over-occupation of energy brought about by consciousness. But we are aware that this refinement is seldom completely successful even in the most normal psychic life and that our thoughts ever remain accessible to falsification through the interference of the principle of pain.
This, however, is not the breach in the functional efficiency of our psychic apparatus through which the thoughts forming the material of the secondary mental work are enabled to make their way into the primary psychic process—with which formula we may now describe the work leading to the dream and to the hysterical symptoms. This case of insufficiency results from the union of the two factors from the history of our evolution; one of which belongs solely to the psychic apparatus and has exerted a determining influence on the relation of the two systems, while the other operates fluctuatingly and introduces motive forces of organic origin into the psychic life. Both originate in the infantile life and result from the transformation which our psychic and somatic organism has undergone since the infantile period.
When I termed one of the psychic processes in the psychic apparatus the primary process, I did so not only in consideration of the order of precedence and capability, but also as admitting the temporal relations to a share in the nomenclature. As far as our knowledge goes there is no psychic apparatus possessing only the primary process, and in so far it is a theoretic fiction; but so much is based on fact that the primary processes are present in the apparatus from the beginning, while the secondary processes develop gradually in the course of life, inhibiting and covering the primary ones, and gaining complete mastery over them perhaps only at the height of life. Owing to this retarded appearance of the secondary processes, the essence of our being, consisting in unconscious wish feelings, can neither be seized nor inhibited by the foreconscious, whose part is once for all restricted to the indication of the most suitable paths for the wish feelings originating in the unconscious. These unconscious wishes establish for all subsequent psychic efforts a compulsion to which they have to submit and which they must strive if possible to divert from its course and direct to higher aims. In consequence of this retardation of the foreconscious occupation a large sphere of the memory material remains inaccessible.
Among these indestructible and unincumbered wish feelings originating from the infantile life, there are also some, the fulfillments of which have entered into a relation of contradiction to the end-presentation of the secondary thinking. The fulfillment of these wishes would no longer produce an affect of pleasure but one of pain; and it is just this transformation of affect that constitutes the nature of what we designate as "repression," in which we recognize the infantile first step of passing adverse sentence or of rejecting through reason. To investigate in what way and through what motive forces such a transformation can be produced constitutes the problem of repression, which we need here only skim over. It will suffice to remark that such a transformation of affect occurs in the course of development (one may think of the appearance in infantile life of disgust which was originally absent), and that it is connected with the activity of the secondary system. The memories from which the unconscious wish brings about the emotional discharge have never been accessible to the Forec., and for that reason their emotional discharge cannot be inhibited. It is just on account of this affective development that these ideas are not even now accessible to the foreconscious thoughts to which they have transferred their wishing power. On the contrary, the principle of pain comes into play, and causes the Forec. to deviate from these thoughts of transference. The latter, left to themselves, are "repressed," and thus the existence of a store of infantile memories, from the very beginning withdrawn from the Forec., becomes the preliminary condition of repression.
In the most favorable case the development of pain terminates as soon as the energy has been withdrawn from the thoughts of transference in the Forec., and this effect characterizes the intervention of the principle of pain as expedient. It is different, however, if the repressed unconscious wish receives an organic enforcement which it can lend to its thoughts of transference and through which it can enable them to make an effort towards penetration with their excitement, even after they have been abandoned by the occupation of the Forec. A defensive struggle then ensues, inasmuch as the Forec. reinforces the antagonism against the repressed ideas, and subsequently this leads to a penetration by the thoughts of transference (the carriers of the unconscious wish) in some form of compromise through symptom formation. But from the moment that the suppressed thoughts are powerfully occupied by the unconscious wish-feeling and abandoned by the foreconscious occupation, they succumb to the primary psychic process and strive only for motor discharge; or, if the path be free, for hallucinatory revival of the desired perception identity. We have previously found, empirically, that the incorrect processes described are enacted only with thoughts that exist in the repression. We now grasp another part of the connection. These incorrect processes are those that are primary in the psychic apparatus; they appear wherever thoughts abandoned by the foreconscious occupation are left to themselves, and can fill themselves with the uninhibited energy, striving for discharge from the unconscious. We may add a few further observations to support the view that these processes designated "incorrect" are really not falsifications of the normal defective thinking, but the modes of activity of the psychic apparatus when freed from inhibition. Thus we see that the transference of the foreconscious excitement to the motility takes place according to the same processes, and that the connection of the foreconscious presentations with words readily manifest the same displacements and mixtures which are ascribed to inattention. Finally, I should like to adduce proof that an increase of work necessarily results from the inhibition of these primary courses from the fact that we gain a comical effect, a surplus to be discharged through laughter, if we allow these streams of thought to come to consciousness.
The theory of the psychoneuroses asserts with complete certainty that only sexual wish-feelings from the infantile life experience repression (emotional transformation) during the developmental period of childhood. These are capable of returning to activity at a later period of development, and then have the faculty of being revived, either as a consequence of the sexual constitution, which is really formed from the original bisexuality, or in consequence of unfavorable influences of the sexual life; and they thus supply the motive power for all psychoneurotic symptom formations. It is only by the introduction of these sexual forces that the gaps still demonstrable in the theory of repression can be filled. I will leave it undecided whether the postulate of the sexual and infantile may also be asserted for the theory of the dream; I leave this here unfinished because I have already passed a step beyond the demonstrable in assuming that the dream-wish invariably originates from the unconscious.[2] Nor will I further investigate the difference in the play of the psychic forces in the dream formation and in the formation of the hysterical symptoms, for to do this we ought to possess a more explicit knowledge of one of the members to be compared. But I regard another point as important, and will here confess that it was on account of this very point that I have just undertaken this entire discussion concerning the two psychic systems, their modes of operation, and the repression. For it is now immaterial whether I have conceived the psychological relations in question with approximate correctness, or, as is easily possible in such a difficult matter, in an erroneous and fragmentary manner. Whatever changes may be made in the interpretation of the psychic censor and of the correct and of the abnormal elaboration of the dream content, the fact nevertheless remains that such processes are active in dream formation, and that essentially they show the closest analogy to the processes observed in the formation of the hysterical symptoms. The dream is not a pathological phenomenon, and it does not leave behind an enfeeblement of the mental faculties. The objection that no deduction can be drawn regarding the dreams of healthy persons from my own dreams and from those of neurotic patients may be rejected without comment. Hence, when we draw conclusions from the phenomena as to their motive forces, we recognize that the psychic mechanism made use of by the neuroses is not created by a morbid disturbance of the psychic life, but is found ready in the normal structure of the psychic apparatus. The two psychic systems, the censor crossing between them, the inhibition and the covering of the one activity by the other, the relations of both to consciousness—or whatever may offer a more correct interpretation of the actual conditions in their stead—all these belong to the normal structure of our psychic instrument, and the dream points out for us one of the roads leading to a knowledge of this structure. If, in addition to our knowledge, we wish to be contented with a minimum perfectly established, we shall say that the dream gives us proof that the suppressed, material continues to exist even in the normal person and remains capable of psychic activity. The dream itself is one of the manifestations of this suppressed material; theoretically, this is true in all cases; according to substantial experience it is true in at least a great number of such as most conspicuously display the prominent characteristics of dream life. The suppressed psychic material, which in the waking state has been prevented from expression and cut off from internal perception by the antagonistic adjustment of the contradictions, finds ways and means of obtruding itself on consciousness during the night under the domination of the compromise formations.