Competing Theories of Borderline Personality Disorder.

The authors review four theories that propose different conceptualizations of borderline personality disorder's (BPD) core psychopathology: excess aggression, emotional dysregulation, failed mentalization, and interpersonal hypersensitivity. The theories are compared in their ability to explain BPD's coaggregation of four usually distinct sectors of psychopathology, their high overlap with other disorders, their ability to distinguish BPD from other disorders, their integration of heritability, and their clinical applicability. The aims of this review are to increase awareness of these theories, to stimulate improved theories, and to f ster testable hypotheses so that research can advance our knowledge about BPD's core.