Identity pathology and borderline personality disorder: an empirical overview

Pathological identity-related functioning is a core feature of borderline personality disorder (BPD) that is grievously underrepresented in the empirical literature. Burgeoning evidence indicates that identity pathology is multifaceted, influenced by transactions between social and endogenous processes, and associated with a wide variety of maladaptive outcomes. Although historically defined by patterns of instability (e.g. frequent and rapid changes to career goals, religious beliefs, core values, friend groups, etc.), accumulating research indicates that identity pathology also manifests as distress and functional impairment related to excessive rigidity (i.e. unrelenting negative self-evaluations; overidentification with a restricted role or group membership) and/or incongruous behavior (i.e. simultaneously holding discordant beliefs/values/attitudes, actions that are grossly contradictory with values, incoherent sense of self, etc.). Despite the complex nature of this construct, and its centrality to BPD, researchers often assess identity pathology indirectly, inadequately, or fail to measure it entirely. In this article, we briefly describe how identity pathology may fit into etiological models of BPD, highlight emerging themes from recent research, and identify important gaps in our knowledge. We also discuss limitations associated with current assessment practices, recommend alternatives, and articulate a research agenda for the future.