Prototype Models of Personality Disorders: Prototype Convergence and Association With Pathological Traits

Area of Science:

• Psychiatry
• Clinical Psychology

Background:

• The Alternative Model of Personality Disorders (AMPD) aims to refine personality disorder (PD) diagnosis.
• Different theoretical models exist for classifying PDs, leading to questions about construct overlap.

Purpose of the Study:

• To compare pathological trait profiles of PD prototypes from three distinct models.
• To evaluate the convergence of these models within the AMPD framework.

Main Methods:

• Trainee clinicians (N=329) rated patients using the Shedler-Westen Assessment Procedure (SWAP-II), DSM-5 hybrid model prototypes, and Psychodynamic Diagnostic Manual (PDM) prototypes.
• Correlations between each PD prototype model and DSM-5 traits were analyzed.

Main Results:

• Theoretically similar prototypes across SWAP-II, DSM-5, and PDM demonstrated correlations with several traits, exhibiting small-to-large effect sizes.
• Generally, similar prototypes displayed comparable trait profiles, with some noted exceptions.

Conclusions:

• The SWAP-II, DSM-5, and PDM prototype models appear to assess overlapping constructs in personality pathology.
• Findings support the utility of these distinct models within the AMPD, despite theoretical differences, impacting PD diagnostic practices.