Rigid and extreme: a geometric representation of personality disorders in five-factor model space

Area of Science:

• Psychology
• Personality Psychology
• Clinical Psychology

Background:

• Personality disorders are often characterized by rigidity and extremity.
• The 5-factor model (FFM) provides a framework for understanding normal personality traits.
• Operationalizing personality disorder constructs within trait models is an ongoing challenge.

Purpose of the Study:

• To geometrically define and operationalize personality disorder rigidity and extremity within the FFM.
• To investigate the coexistence and spatial distribution of normal and disordered personalities in the FFM multivariate space.
• To examine the similarities and differences in personality profiles between normal and disordered individuals.

Main Methods:

• Derivation of geometric and substantive assumptions for defining personality disorder features.
• Testing these assumptions in a large sample of college students (N = 1,323) and a clinical sample of psychiatric patients (N = 86).
• Utilizing multiple measures for both personality disorders and normal personality traits.

Main Results:

• Normal and disordered personalities were found to occupy various regions within the FFM multivariate space.
• Within shared regions, personality profiles showed similar configurations but differing variability.
• Individuals with personality disorders were predominantly located in the outer regions (perimeters) of the FFM space, indicated by longer vector lengths.
• These results were consistent across different measures of personality disorders and normal traits.

Conclusions:

• Personality disorder rigidity and extremity can be effectively operationalized within the FFM using geometric principles.
• The FFM space accommodates both normal and disordered personality configurations, with disorders characterized by greater profile variability and extremity.
• The findings support a dimensional view of personality pathology within the FFM framework.