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The brain's plasticity without a doubt remains a major discovery but the experience of fixity, especially at the end of treatment, nevertheless points to an initial factor of weight. The author proposes to consider the crises that can be provoked by this tension from the point of view of certain processes that, on a psychic level, reproduce the fixity of neuronal wiring that resides at the very heart of a subject's development. Certain patients can only extricate themselves from certain primitive and conditioned reactions of survival after a lengthy process of working-through of their defence system has been successfully accomplished. This effectively implies a violent crisis that offers a representation of the repetition in question in the present context of the transference, thus triggering a decisive process of reorganisation.