How does it come about that such an intensively accentuated presentation group should be kept so isolated? As a rule the role played by an idea in the association really increases with the sum of its affect.
This question can be answered if we bear in mind two facts which we can make use of as a safeguard: (1) That the hysterical pains originated simultaneously with the formation of these separate psychic groups, (2) that the patient exerted great resistance against the attempt to bring about the association between the separate psychic groups and the rest of the content of consciousness, and when the union was finally effected she perceived excessive psychic pain. Our conception of hysteria brings together these two moments with the fact of the splitting of consciousness, for (2) contains the indication for the motive for the splitting of consciousness while (1) shows the mechanism of the same. The motive was that of defense, it was the striving of the whole ego to agree with this presentation group and the mechanism was that of conversion, that is, instead of psychic pains which she spared herself there appeared physical pains. Thus a transformation occurred through which pain the patient had escaped an unbearable psychic state, though it was at the cost of a psychic anomaly in the form of a splitting of consciousness and a physical suffering, pains, upon which an astasia-abasia was constructed. To be sure I can give no instruction as to how one can bring about such a conversion. It is not apparently done as one intertionally does an arbitrary action, it is a process whidi is executed in the individual under the impulse of the motive of defense if an adaptation for it exists in his organization or is brought about by temporary modification.
One has the right to attack the theory more closely by asking what it is that is transformed into physical pains. The cautious reply will be something out of wbich psychic pains could have and should have been formed. If we wish to venture further and attempt a kind of algebraic formulation of the presentation mechanism we may attribute to the presentation complex of this unconsciously remaining love a certain amount of affect and designate the latter quantity as the thing converted. Direct deduction of this conception would be the fact that the "unconscious love" has through such conversion forfeited so much of its intensity that
