Emotional hyperreactivity (Linehan, 1993) is the most investigated construct in borderline personality disorder (BPD). However, experimental studies revealed mixed results on the topic. Our main objective is to comprehensively summarize the results on emotional reactivity in BPD compared to healthy controls (HCs), using a meta-analytic approach, considering different emotional response systems (physiology, behavior, self-report). We included 31 experimental studies (1,675 subjects). We observed null to small effect sizes for several physiological and behavioral outcomes. Conversely, BPD subjects revealed a moderate to large difference in valence attributed to emotional stimuli and a small difference in self-reported arousal. Significant differences in pooled effect sizes were found between self-report and physiological outcomes. Several sources of heterogeneity were explored. In general, the hyperreactivity hypothesis was not supported. Additional dysfunctional processes should be taken into consideration to understand BPD emotional responsiveness.
Keywords: Linehan's model; borderline personality disorder; emotional reactivity.