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Disturbed interpersonal relationships specific to borderline personality disorder (BPD) suggest biased processing of social information. The goal of this study was to examine alterations in mental state decoding (MSD) and their associations with early maladaptive schemas (EMS) that may lead to the misinterpretation of incoming information. In addition, the authors' aim was to evaluate the effects of a co-occurring current major depressive episode (MDE) on the MSD performance of BPD patients. Seventy-eight BPD patients (34 with MDE) and 76 matched healthy controls (HC) were assessed for Reading the Mind in the Eyes Test (RMET) and the level of EMS. The authors found that impairment in the total RMET performance, as well as specific impairment regarding the recognition of positive and neutral items, was associated with EMS, and enhanced vigilance to negative mental states was characteristic to BPD with MDE. Results suggest that MSD ability is altered in two independent ways in BPD.

The authors examined social decision-making strategies in borderline personality disorder (BPD) using the Ultimatum Game (UG). They sought to extend previous findings by investigating altruistic punishment, a behavior that increases group cooperation in the long term. They tested the effect of the proposer's facial expression on responses. BPD patients (n = 47) and healthy controls (n = 43) played the responder's role in a series of computerized UG interactions, with proposers expressing positive or negative emotions. BPD patients accepted unfair offers at a higher rate compared to controls. The effect of facial expression differed in the two groups, as positive expressions increased the acceptance likelihood in the control group at stakes from 20:80 to 50:50. In the BPD group, this effect was observed only at higher stakes (40:60 and 50:50). These results suggest that BPD patients exhibit altruistic punishment to a lesser extent and are less influenced by their partners' emotional expression in the UG.

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