The defence neuro-psychoses 1894-001/1924.en
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    IV

    THE DEFENCE NEURO-PSYCHOSES'

    An endeavour to provide a psycho-

    logical theory of acquired hysteria,

    many phobias and obsessions, and
    rtin hallucinatory psychoses.

    (1894)

    fter a close study of several patients suffering

    from phobias and obsessions a tentative eX-

    planation of these symptoms forced itself upon
    ine; and as it later enabled me successfully to divine
    the origin of similar pathological ideas in other cases,
    I consider it worthy of publication and of further
    tests. Along with this “psychological theory of
    phobias and obsessions’, observation of these patients
    has resultedin a contribution to the theory of hysteria,
    or rather an alteration in it, which appears to account
    for an important characteristic common both to
    hysteria and to the neuroses mentioned above.
    Further, I had opportunities of gaining some insight
    into the psychological mechanism of a form of disease
    that is undoubtediy of mental origin, and then found
    that the tentative point of view I had adopted esta-
    blished an intelligible connection between these. psy-
    choses and the two neuroses mentioned. At the end
    of this essay I shall bring forward an hypothesis
    which I have employed in all three cases.

    1

    Let me begin with the alteration that in my view
    we are called upon to make in the theory of the
    hysterical neurosis.

    = Gasse published in the Neurologische Zentralblatt, 1894, Nos. 10
    And 15 ranslated by John Rickman.]

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    Since the publication of the fine work carried out
    by P. Janet, J. Breuer and others, it may be taken
    as generally acknowledged that the syndrome of
    hysteria, in so far as it permits of understanding up
    to the present, justifies the concept of a splitting of
    consciousness, with the formation of separate psych-
    ical groups; opinions are less definite, however,
    concerning the origin of this splitting of conscious-
    ness and the part which this character plays in the
    structure of the hysterical neurosis.

    According to Janet’s theory? the splitting of con-
    sciousness is a primary feature of the hysterical
    change. It is dependent on an inborn weakness in the
    capacity for psychical synthesis, on the narrowness
    of the ‘field of consciousness’ (champ du conscience)
    which in the form of a psychic stigma is evidence of
    the degeneration of hysterical persons.

    In contradistinction to Janet’s view, which seems
    to me to admit of many and various objections, we
    have that advocated by J. Breuer in our joint public-
    ation?. According to Breuer, the ‘foundation and
    condition’ of hysteria is the occurrence of peculiar
    dream-like states of consciousness with diminished
    capacity for association, for which he suggests the
    name ‘hypnoid states’. The splitting of consciousness
    is then secondary and acquired; it occurs because
    the ideas which emerge in hypnoid states are cut off
    from associative connection with the remaining
    contents of consciousness.

    I can now bring forward evidence of two other more
    extreme forms of hysteria in which it is impossible
    to regard the splitting of consciousness as primary
    in Janet’s sense. In the first of these forms I repeat-

    ? Etat mental des hysteriques, Paris, 1803 and 1894. — Quelques
    difinitions recentes de Y’'hysterie, Avchives de Neurologie, 1893,
    XXXV—XXXVL

    2 See No. II of this volume, above, p. 24.

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    1894 THE DEFENCE NEURO-PSYCHOSES 61

    edly succeeded in demonstrating that the splitting
    of the contents of consciousness is the consequence
    of a voluntary act on the part of the patient; that is
    to say, it is instituted by an effort of will, the motive
    of which is discoverable. By this I do not of course
    mean that the patient intends to produce a splitting
    of his consciousness; the patient’s aim is a different
    one, but instead of attaining its end it produces a
    splitting of consciousness.

    In the third form of hysteria, as shown by the
    mental analysis of intelligent patients, the splitting
    of consciousness plays an insignificant part, or per-
    haps none at all. These are the cases in which all
    that had happened was that the reaction to traum-
    atic stimuli had failed to occur, so that they are
    accordingly dissolved and cured by ‘abreaction’!—
    they are the pure ‘retention’ hysterias.

    In connection with what I have to say about
    phobias and obsessions I shall here deal only with
    the second form of hysteria, which for reasons that
    will soon be evident I shall designate as defence
    hysteria, and distinguish by this name from hypnoid
    and vetention hysteria. I may also provisionally re-
    present my cases of defence hysteria as cases of
    “acquired hysteria’, because there was in them no
    question either of grave hereditary taint or of indi-
    vidual atrophic degeneration.

    These patients whom I analysed had enjoyed good
    mental health up to the time at which an intolerable
    idea presented itself within the content of their
    ideational life; that is to say, until their ego was
    confronted by an experience, an idea, a feeling,
    arousing an affect so painful that the person resolved
    to forget it, since he had no confidence in his power

    ı See No. II of this volume, above, p. 24.

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    to resolve the incompatibility between the unbearable
    idea and his ego by the processes of thought.

    Such unbearable ideas develop in women chiefly
    in connection with sexual experiences and sensations,
    and the patients can recollect with the most satis-
    factory minuteness their efforts at defence—their
    resolution to ‘push the thing out’, not to think of it,
    to suppress it. I will give from my experience some
    examples which I could casily multiply: A young
    girl who disapproved of herself because while nursing
    her sick father she had let her mind dwell on the
    thought of a young man who had made a slight erotic
    impression on her; a governess who had fallen in
    love with her employer and had resolved to thrust
    this affection from her mind because it appeared to
    her incompatible with her pride; and so on.t

    I do not of course assert that an effort of will to
    thrust such things out of the mind is a pathological
    act, nor am I able to say whether and in what manner
    intentional forgetting is successful in pcople who
    remain healthy, although subject to similar mental
    impressions. I only know that this kind of ‘forgetting’
    did not succeed with the patients whom I analysed,
    but led to various pathological reactions, giving rise
    either to hysteria, or to an obsession, or to an hallu-
    cinatory psychosis. The ability to bring about by
    an effort of will one of these states, which are all of
    them associated with splitting of consciousness, is to
    be regarded as the manifestation of a pathological
    disposition—which, however, is not necessarily ident-
    ical with personal or hereditary ‘degeneration’.

    In regard to the intermediate processes between the
    patient’s effort of will and the onset of the neurotic
    symptom, I have formed an opinion which may be

    ’ These examples are more fully described in Studien über Hysterie,
    Breuer and Freud. 1895.

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    expressed in the customary psychological abstractions
    somewhat as follows: The task which the ego under-
    takes in defence—of treating the unbearable idea as
    ‚non arrivee'—is absolutely insoluble; both the mem-
    ory-trace and the affect attached to the idea are
    there once and for all, and it is no longer possible to
    extirpate them. But it amounts to an approximate
    fulfilment of this task if the ego succeeds in trans-
    forming a strong idea into a weak one, in depriving
    it of its affect—the quantity of excitation with which
    the idea is charged. The weak idea will then make
    practically no demands on the work of association;
    the quantity of excitation, however, which is then
    detached from the idea, must be utilized in another
    direction.

    Up to this point the processes are the same in
    hysteria and in phobias and obsessions ; from now
    onwards their ways diverge. In hysteria the unbear-
    able idea is rendered innocuous by the quantity of
    excitation attached to it being transmuted into some
    bodily form of expression, a process for which I
    should like to propose the name of conversion.

    The conversion may be either total or partial, and
    it proceeds along the line of the motor or sensory
    innervation that is more or less intimately related to
    the traumatic experience. Thus the ego succeeds in
    resolving the incompatibility within itself; but instead
    it has burdened itself with a memory-symbol, which
    dwells in consciousness, like a sort of parasite, either
    in the form of a persistent motor innervation or else
    as a constantly recurring hallucinatory sensation,
    and remains until a reversion takes place in the
    opposite direction. The memory-trace of the repressed
    idea is not, however, annihilated by this process ;
    on the contrary, from now onwards it forms the
    nucleus of a secondary psychical group.

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    I will only add a few more words to this conception
    of the psycho-physical processes in hysteria. When
    once such a nucleus of an hysterical splitting has been
    formed owing to a “traumatic’ factor it will be
    developed by the influence of other factors (which
    might be called ‘auxiliary traumatic’ factors) as
    soon as an impression of a similar kind, subsequently
    experienced, succeeds in breaking through the barriers
    erected by the will, in furnishing the weakened idea
    with fresh affect and in re-establishing for a time an
    associative connection between the two psychical
    groups—until a further conversion creates a defence
    against it. The distribution of exeitation thus brought
    about in hysteria proves as a rule an unstable one;
    the excitation which is directed into a wrong channel
    (into somatic innervation) now and then finds its
    way back to the idea from which it was detached, and
    then compels the subject either to undertake the
    work of associative absorption or else to discharge
    it by the way of hysterical attacks—a conclusion
    which is supported by the familiar opposition between
    the hysterical attack and chronic symptoms. Breuer’s
    cathartic method achieves its results by deliberately
    effecting such a re-transmutation of the excitation
    {rom the somatic into the mental field, in order then
    to enforce a resolution of the opposed elements by
    a process of thought and a discharge of the excitation
    in speech.

    The conclusion that the splitting of consciousness
    in acquired hysteria is based on an act of will also
    explains with surprising simplicity the remarkable
    fact that hypnosis regularly widens the narrowed
    consciousness of the hysteric and makes the psychical
    group which has been split off accessible. Indeed, we
    know it to be a peculiarity of all sleep-like conditions
    that thev abrogate that distribution of excitation

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    upon which the ‘will’ of the conscious personality
    depends.

    Thus we can see that the characteristic factor in
    hysteria is not to be found in the splitting of conscious-
    ness but in the capacity for conversion, and we may
    assume that the psycho-physical capacity to trans-
    mute such large quantities of excitation into somatic
    innervation is an important element of the dis-
    position to hysteria, which in other respects is still
    unknown.

    This capacity does not in itself preclude mental
    health and leads to hysteria only where there is some
    mental incompatibility or an accumulation of ex-
    citation. With this new turn in the theory Breuer
    and I approach Oppenheim’s! and Strümpell’s® well-
    known definition of hysteria, and recede from Janet?
    who assigns too great importance to the splitting of
    consciousness as a characteristic of hysteria. The
    presentation here given may claim to have rendered
    the relation between conversion and the hysterical
    splitting of consciousness intelligible.

    u

    If the capacity for conversion does not exist in a
    person predisposed to hysteria and yet the separation
    of its affect from an unbearable idea is nevertheless

    3 Oppenheim: Hysteria is an intensified expression of emotion.
    The ‘expression of emotion’, however, represents that quantity ol
    the psychical excitation which normally undergoes conversion.

    3 Strümpell: In hysteria the disturbance lies in the psycho-
    physical sphere, where body and mind have their connection with
    each other.

    ® In the second edition of his ingenious paper, ‘Quelgues defini-
    tions, etc’, Janet has himself dealt with the objection that splitting
    of consciousness occurs also in the psychoses and in psychasthenia,
    so-called, but in my judgement he has not solved the difficulty
    satisfactorily. It is essentially this objection that has forced him
    to regard hysteria as a form of degeneration. He cannot, however,
    adequately distinguish the hysterical splitting of conseiousness from
    he psychotic and other such forms by any characterization.

    g

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    undertaken as a defence against the latter, then this
    affect must persist in the psychical sphere. Thus
    weakened, the idea remains present in consciousness,
    detached from all associations; but its affect, now
    freed from it, attaches itself to other ideas which
    are not in themselves unbearable, but which through
    this ‘false connection’ grow to be obsessions. This
    is shortly the psychological theory of obsessions and
    phobias which I mentioned to start with.

    I will now enumerate the various elements necess-
    ary to the structure of this theory that admit of
    direct proof, and then describe those that I have
    myself supplied. Apart from the final result of the
    process, that is, the obsession, it is possible in the
    first place to demonstrate the ultimate source of
    the affect which is now falsely attached to some other
    idea. In all the cases I have analysed it was in the
    sexual life that a painful affect—of precisely the
    same quality as that attaching to the obsession—had
    originated. On theoretical grounds it is not impossible
    that this affect may at times arise in other spheres; I
    have merely to state that hitherto I have not dis-
    covered any other origin of it. Incidentally, it is
    easy to see that it is precisely in regard to the sexual
    life that unbearable ideas most frequently arise.

    Further, we have the most unequivocal utterances
    on the part of patients in proof of the effort of will,
    the attempt at defence, upon which the theory lays
    emphasis; and in at least a number of cases the
    patients themselves will inform us of the fact that
    the phobia or obsession first made its appearance
    after this effort of will had apparently succeeded in
    its aim. ‘Once something very disagreeable happened
    to me, and I did my utmost to thrust it out of my
    mind, to think no more about it. Finally I succeeded,
    but then I got this, which since then I have never

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    been rid of.” With these words a patient confirmed
    the chief points of the theory I have developed here.

    Not all those who suffer from obsessions are them-
    selves so clear about the origin of them. Asa rule,
    when one draws these patients’ attention to the
    original idea of a sexual nature, the answer is, ‘It
    can’t come from that; indeed, I thought very little
    about that. For a moment I was scared, but I turned
    my mind to something else and since then it hasn’t
    troubled me.’ In this frequent objection we have a
    proof that the obsession represents a substitute or
    surrogate for the unbearable sexual idea, and has
    taken its place in consciousness.

    Between the patient’s effort of will which success-
    fully represses the intolerable sexual idea, and the
    appearance of the obsessional idea, which though
    having little intensity in itself is now endowed with
    incomprehensibly strong affect, there lies a gap which
    the theory here developed aims at filling in. The
    detachment of the sexual idea from its affect and
    the connection of the latter with another idea, suited
    to it but not intolerable, are processes which occur
    outside consciousness—they may be presumed but
    they cannot be proved by any clinical-psychological
    analysis. Perhaps it would be more correct to say:
    These processes are not of a psychical nature at all,
    but are physical processes the psychical consequences
    of which are so represented as if what is expressed by
    the words ‘detachment of the idea from its affect
    and false connection of the latter’ had really happened.

    Alongside the cases which show the unbearable
    sexual idea followed subsequently by the obsession,
    there is another series in which obsessions and painful
    sexual ideas are present simultaneously. We cannot
    very well call the latter ‘sexual obsessions’, for one
    essential feature of obsessions is missing from them;

    .*
    5:

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    they are fully justified, whereas the painfulness of
    the ordinary obsession constitutes a problem for both
    physician and patient. So far as I have been able
    to see in cases of this kind, it appears that in them
    a perpetual defence is going on against sexual ideas
    continually arising anew ; that is, we are here concerned
    with an operation that has not yet been completed.

    As long as they are conscious of the sexual origin
    of their obsessions, the patients often keep them
    concealed. When they complain about them, they as
    a rule express their astonishment that they are sub-
    ject to the affect in question—that they feel anxious,
    or that they have such and such an impulse, and so
    on. To the experienced physician this affect appears,
    on the contrary, to be justified and comprehensible;
    he only finds it surprising that an affect of that kind
    should be associated with an inappropriate idea. The
    affect of the obsession appears to him, in other words,
    to be dislocated or transposed, and if he is proceeding
    on the assumptions here laid down he can in a great
    number of cases attempt its re-translation into the
    sexual.

    Any idea which is either suited by nature to be
    associated with an affect of this quality or else bears
    a certain relation to the unbearable idea—in conse-
    quence of which it appears practicable to employ it
    as a surrogate for the latter—may be made use of
    in secondary connection with the detached affect.
    Thus for example, an unattached anxiety, the sexual
    origin of which the patient is unable to recall, will
    seize upon the common primary phobias of mankind
    in regard to animals, thunderstorms, darkness and
    the like, or upon things which are manifestly asso-
    ciated with the sexual in some way or other, such as
    urination, defscation, defilement and contagion
    generally.

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    The ego gains considerably less advantage by
    choosing the method of iransposition of affect as a
    measure of defence than it does by the hysterical
    conversion of psychical exeitation into somatic inner-
    vation. The affect which the ego had to endure
    remains unchanged and undiminished, just as be-
    fore—the only difference being that the unbearable
    idea is suppressed and cut off from recollection. The
    repressed ideas then form again the nucleus of a
    second psychical group, which, as it seems to me, is
    accessible even without the aid of hypnosis. If in
    phobias and obsessions the striking symptoms which
    in hysteria accompany the formation of an inde-
    pendent psychical group fail to appear, this is prob-
    ably because in the former the whole transformation
    takes place within the psychical sphere—the relation
    between psychical excitation and somatic inner-
    vation has undergone no change.

    To illustrate what has been said concerning ob-
    sessions I will give a few examples, which are probably
    typical:

    1. A young girl suffered from obsessive reproaches.
    If she read in the papers about counterfeiting coinage
    the thought occurred to her that she also had forged
    coins; if an unknown criminal had committed a
    murder she asked herself anxiousiy whether she had
    not done the deed. At the same time she was quite
    conscious of the absurdity of these obsessive re-
    proaches. This sense of guilt gained for a time such
    an influence over her that her critical faculty was
    stifled, so that she accused herself to her relatıons
    and her physician of having really committed all
    these crimes (psychosis through simple intensification
    —overwhelming-psychosis—Ü! berwältigungspsychose).
    A close examination then revealed the source in which
    her sense of guilt arose: Accidentally stimulated by

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    a voluptuous sensation, she had allowed herself to
    be led astray by a friend into masturbation and had
    practised it for years, with full knowledge of her
    wrong-doing and accompanied by most intense self-
    reproaches, which as usual were of no avail. An
    excessive indulgence after attending a ball had
    evoked the intensification leading to the psychosis.
    After a few months of treatment and close watching
    the patient was cured.

    2. Another young girl had suffered from the dread
    of being forced to pass water and wet herself ever
    since the time when an impulse of this kind had
    really obliged her to leave a concert during a per-
    formance. This phobia had gradually made her
    completely unable to enjoy herself or to go into
    society. She only felt well if there was a closet near
    at hand to which she could have access without
    arousing attention. Any organic complaint justifying
    this lack of confidence in her control of the bladder
    was excluded; at home under quiet conditions and
    at night the urgency did not arise. A penetrating
    enquiry showed that the urgency had appeared for
    the first time in the following circumstances: A
    gentleman to whom she was not indifferent had been
    sitting not far from her at the concert; she began to
    think about him and to imagine how she would sit
    beside him as his wife. During this erotic reverie
    she had that bodily sensation which is to be com-
    pared with erection in men and which in her casc—I
    do not know if it is always so—ended with a slight
    desire to micturate. She became greatly frightened
    by the sexual sensation, to which she was otherwise
    quite accustomed, because she had resolved within
    herself to overcome her affection for this man as
    well as for all others, and the next moment the affect
    transferred itself to the accompanying desire to

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    micturate and compelled her to leave the hall after
    a very painful struggle. In her life she was so prudish
    that ‘she positively shuddered at anything sexual
    and could not even contemplate the thought of
    marrying; on the other hand, she was sexually so
    hyperzsthetic that during every erotic reverie, which
    she willingly indulged in, that pleasurable sensation
    appeared. The erection was always accompanied by
    the desire to micturate which, up to the time of the
    scene at the concert, had made no impression on her.
    Treatment led to a nearly complete mastery of the
    phobia.

    3. A young woman who in five years of married
    life had’had only one child complained to me of an
    obsessive impulse to throw herself from the window
    or balcony, and also of the fear of stabbing her child
    which seized her at the sight of a sharp knife. She
    confessed that marital relations seldom occurred,
    and only with precautions against conception; but
    she added that this was no privation to her as she
    was not of a sensual nature. I ventured to tell her
    that at the sight of a man she had erotic ideas and
    that she had therefore lost confidence in herself and
    regarded herself as a depraved person, capable of
    anything. The re-translation of the obsession into
    the sexual was successful; in tears she confessed at
    once to her long-concealed misery in her marriage and
    later on related in addition some painful thoughts
    of an unchanged sexual nature, such as the often-
    recurring sensation of something foreing itself under
    her skirts.

    I have turned experiences of this kind to thera-
    peutic advantage by re-directing the attention of
    patients with phobias and obsessions, in spite of all
    their protestations, back to the repressed sexual
    ideas and, where feasible, in blocking the source

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    whence they arose. I naturally cannot assert that
    all phobias and obsessions arise in the manner here
    described; for, first, my experience of them embraces
    only a limited number as compared with the relative
    frequency of these neuroses, and secondly, I myself
    know that these ‘psychasthenic’ symptoms, as Janet
    terms them, are not all to be estimated alike.* There
    are, for example, pure hysterical phobias. I believe,
    however, that the mechanism of transposition of
    affect will be found to exist in the great majority of
    phobias and obsessions; and I would therefore urge
    that these neuroses, which are as often found in an
    isolated form as combined with hysteria or neur-
    asthenia, should not be loosely classified together
    with ordinary neurasthenia, in which there is absol-
    tely no ground for assuming a psychical mechanism
    of the principal symptoms.

    II

    In both the cases described above defence against
    an unbearable idea was effected by detachment of
    its affect from it; the idea itself remained in con-
    sciousness, although weakened and isolated. Now
    there exists a very much more energetic and success-
    ful kind of defence, which takes the following form:
    the ego rejects the unbearable idea together with its
    associated affect and behaves as if the idea had
    never occurred to the person at all. But, as soon as
    this process has been successfully carried through,
    the person in question will have developed a psychosis,
    and his state can only be described as one of ‘hallu-

    i The group of typical phobias, of which agoraphobia is a model,
    cannot be traced back to the psychical mechanism mentioned above;
    on the contrary, the mechanism of agoraphobia differs from that
    of true obsessions, and of the phobias derived from them, in one
    decisive particular—there is here no repressed idea from which the

    affect of anxiety would be detached. The anxiety of these phobias
    has another origin.

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    cinatory confusion’. A single example will serve to
    illustrate this.

    A young girl gave her first impulsive affection to
    a man and firmly believed in the return of her love.
    As a matter of fact she was mistaken; the young
    man had another motive for visiting the house. Dis-
    appointments were not spared her; first of all she
    defended herself against her experiences by means
    of hysterical conversion, thus preserving her belief
    that he would one day come and seek her hand;
    but at the same time she felt unhappy and ill on
    account of incomplete conversion and of the perpet-
    ual experience of fresh painful impressions. Finally
    on a certain day, the day of a family festival, she
    waited for him in a state of intense excitement. The
    day wore on without his coming; after all the trains
    by which he could arrive had gone by, her condition
    passed into one of hallucinatory confusion. He is
    come, she hears his voice in the garden, hastens
    downstairs in her night-dress to receive him. From
    that time she lived for two months in a happy dream,
    of which the content was that he is there, ever by
    her side, everything is as it was a little while ago
    (before the time of the disappointment against which
    she had so strenuously defended herself). The hysteria
    and the depression of spirits were both overcome;
    nothing of the latter period of doubt and suffering
    was alluded to during her illness; she was happy as
    long as she was left undisturbed, and only raved
    when some circumstance of her surroundings pre-
    vented her from carrying out the logical promptings
    of her blissful dream. This psychosis, which at the time
    of its occurrence had been unintelligible, was explained
    ten years later with the aid of an hypnotic analysis.

    The fact to which I now wish to call attention is
    that the content of such an hallucinatory psychosis

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    consists precisely in the accentuation of the very
    idea which was first threatened by the experience
    occasioning the outbreak of the illness. One is there-
    fore justified in saying that the ego has averted the
    unbearable idea by a flight into psychosis; and the
    process by which this result is obtained again with-
    draws itsclf out of range of self-perception as well
    as of psychological-clinical analysis. It is to be
    regarded as the expression of a high degree of patho-
    logical predisposition and may perhaps be described
    somewhat as follows: The ego has broken away from
    the unbearable idea; but, the latter being insepar-
    ably bound up with a part of reality, in so far as the
    ego achieves this result it has also cut itself loosc
    irom reality, totally or in part. In my opinion, this
    is the condition under which certain ideas acquire
    hallucinatory vividness, and consequently when this
    form of defence is successfully carried through the
    person finds himself in a state of hallucinatory
    confusion.

    I have very few analyses of psychoses of this kind
    at my disposal; but I think we must here be con-
    cerned with a type of psychical illness that is very
    frequently developed, for in no insane asylum are
    analogous examples wanting—for instance, the mo-
    ther who, falling ill after the loss of her baby, is to be
    seen incessantly rocking a log of wood in her arms,
    or the jilted bride arrayed in all her finery who has
    for years been awaiting her betrothed.

    It is perhaps not superfluous to point out that the
    three modes of defence here described, together with
    the three forms of illness to which they lead, may all
    be combined in the same person. The simultaneous
    appearance of phobias and hysterical symptoms,
    observed so often in practice, is one of those factors
    which render it difficult to distinguish hysteria in a

  • S.

    1894 THE DEFENCE NEURO-PSYCHOSES 75

    clear-cut manner from other neuroses, and make it
    necessary to set up the category of ‘mixed neuroses’.
    To be sure, hallucinatory confusion is not often
    compatible with a continuance of hysteria, nor of
    obsessions, as a rule. On the other hand, it is not
    rare for a defence psychosis to break out episodically
    in the course of an hysterical or mixed neurosis.

    I should like finally to dwell for a moment on the
    hypothesis which I have made use of in the exposition
    of the defence neuroses. I mean the conception that
    among the psychic functions there is something which
    should be differentiated (an amount of affect, a sum
    of exeitation), something having all the attributes of
    a quantity—although we possess no means of measur-
    ing it—a something which is capable of increase,
    decrease, displacement and discharge, and which
    extends itself over the memory-traces of an idea like
    an electric charge over the surface of the body. We
    can apply this hypothesis, which by the way already
    underlies our theory of ‘abreaction’,' in the same
    sense as the physicist employs the conception of a
    fluid electric current. For the present it is justified
    by its utility in correlating and explaining diverse
    psychical conditions.

    "2 See No. II of this volume, above, p. 24.