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Let us be clear that the hallucinatory wishful psychosis - in dreams or
elsewhere - achieves two by no means identical results. It not only brings hidden
or repressed wishes into consciousness; it also represents them, with the
subject’s entire belief, as fulfilled. The concurrence of these two results calls for
explanation. It is quite impossible to maintain that unconscious wishes must
necessarily be taken for realities when once they have become conscious; for, as
we know, our judgement is very well able to distinguish realities from ideas
and wishes, however intense they may be. On the other hand, it seems justifiable
to assume that belief in reality is bound up with perception through the
senses. When once a thought has followed the path to regression as far back as to
the unconscious memory-traces of objects and thence to perception, we accept the
perception of it as real. So hallucination brings belief in reality with it. We
now have to ask ourselves what determines the coming into being of a
hallucination. The first answer would be regression, and this would replace the problem
of the origin of hallucination by that of the mechanism of regression. As
regards dreams, this latter problem need not remain long unanswered. Regression of Pcs. dream-thoughts to mnemic images of things is clearly the result of the
attraction which the Ucs. instinctual representatives - e.g. repressed memories of experiences -
exercise upon the thoughts which have been put into words. But we soon perceive that
we are on a false scent. If the secret of hallucination is nothing else than
that of regression, every regression of sufficient intensity would produce
hallucination with belief in its reality. But we are quite familiar with situations
in which a process of regressive reflection brings to consciousness very clear
visual mnemic images, though we do not on that account for a single moment take
them for real perceptions. Again, we could very well imagine the dream-work
penetrating to mnemic images of this kind, making conscious to us that was
previously unconscious, and holding up to us a wishful phantasy which rouses our
longing, but which we should not regard as a real fulfilment of the wish.
Hallucination must therefore be something more than the regressive revival of mnemic
images that are in themselves Ucs.