[Experimental detection of inadequate affect regulation in patients with self-mutilating behavior].

According to DSM-IV affective instability in borderline personality disorder is due to marked reactions to environmental events. The aim of this study was to investigate affective responsiveness of abnormal personalities with self-harming impulsive behaviors by means of an affect-stimulation design. The first experiment was based on the presentation of a short story that allowed affective responses to various stimuli to be assessed in regard to quality, intensity, and alterations over time. The second one presented a typical frustration design, which provoked specific feelings of anger and disappointment. Impulsive personalities showed an affective hyperreactivity that was characterized by a decreased threshold for affective responses, as well as by intensive, rapidly changing affects. Furthermore, affect experiences turned out to be qualitatively diffuse and undifferentiated. Results support that affective instability of patients with borderline personality disorder should be differentiated from the autonomous deviations of mood typical of affective disorders. Their affective hyperreactivity is a crucial part of impulsive personality functioning.