Interpersonal coordination processes facilitate interpersonal synchrony through a continuous mutual adaption and corepresentation of self and others' actions. Such a process has been found to enhance prosocial behaviors, affiliation, and trust. While research has investigated the general underlying cognitive and social mechanisms that facilitate interpersonal synchrony, much less is known about how interpersonal impairments influence it in various psychopathological conditions-such as borderline personality disorder (BPD). In this study, we investigated the role of the social cognitive processes of individuals with high BPD traits during a synchronized interaction task. Participants (