Childhood trauma affects processing of social interactions in borderline personality disorder: An event-related potential study investigating empathy for pain.

Patients with borderline personality disorder (BPD) have difficulties in empathising with others and show disturbances in social interactions. Using a 'Social Interaction Empathy Task', we found that BPD patients judged neutral and psychologically painful conditions as more painful than healthy subjects. Here, we present the neural correlates underlying these differences in empathy for pain. Female BPD patients and healthy controls completed the 'Social Interaction Empathy Task' during EEG recording. Event-related potentials (ERP) were analysed for an early anterior component and a late latency positivity. Empathic abilities were assessed using the Interpersonal Reactivity Index and early aversive experiences were measured by the Childhood Trauma Questionnaire (CTQ). ERPs in the patient group matched the behaviour results and correlated with the level of personal distress and CTQ. In addition, ERPs of patients were predicted by childhood maltreatment and stress. Taken together, our findings indicate that the observed behavioural differences between patients with BPD and controls might be due to modulatory effects of empathic abilities on the evaluation of pain-related social stimuli, which are supposed to be based on childhood maltreatment.