The author, using the example of two clinical cases, the first one about an autistic child and the latter about a borderline adolescent, examines the analyst’s difficulty in dealing with acting-outs and enactments that take place during the psychoanalytical treatment. The affective-emotional involvement of the two components of the analytical pair is stressed, which pertains to the "analytic third" register, when, according to concurrent needs, the setting is modified in order to maintain the therapeutic relation.
Keywords: Enactment, sensory empathy, analytic third.