Abstract
Borderline personality disorder is characterized by considerable heterogeneity. The present studies attempt to describe this heterogeneity by locating the borderline construct and its facets in the overall personality structure within the Circumplex of Personality Metatraits and by using the pathological personality traits of the ICD-11. Two studies were conducted with adults – a non-clinical group and a clinical group. It turned out that two facets of the borderline can be differentiated: the Borderline Internalizing Facet and Borderline Externalizing Facet, which have distinct personality underpinnings. General borderline was explained by Negative affectivity, Dissociality, Disinhibition and Detachment. At the facet level, the Borderline Internalizing Facet was mainly explained by Negative affectivity and Detachment, while the Borderline Externalizing Facet was explained by Disinhibition and Dissociality. Moreover, in both groups the general borderline was located close to Alpha-Minus (between Alpha-Minus and Gamma-Minus in the non-clinical group and between Alpha-Minus and Delta-Minus in the clinical group) and the Borderline Internalizing Facet and the Borderline Externalizing Facet were located on both sides of the general borderline. The results of our research revealed broader personality underpinnings of borderline personality disorder and distinct personality underpinnings of its facets.
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