Impulsivity, aggressiveness, and DSM-IV personality disorders

Area of Science:

• Psychiatry
• Clinical Psychology
• Personality Science

Background:

• Personality traits, including impulsivity and aggressiveness, are complex.
• Understanding their relationship with personality disorders (PDs) is crucial for diagnosis and treatment.
• Cluster B PDs (Borderline, Narcissistic, Antisocial, Histrionic) share overlapping features.

Purpose of the Study:

• To investigate if impulsive and aggressive traits exist on a continuum with DSM-IV Cluster B PDs.
• To determine specific associations between personality traits and individual Cluster B PDs.
• To explore the role of sensation seeking in Histrionic PD.

Main Methods:

• Principal component analyses were used to identify underlying personality structures.
• Regression analyses examined the specific associations between personality traits and Cluster B PDs.
• The study included 461 outpatients from a specialized PD clinic.

Main Results:

• A five-factor structure emerged for both normal and psychopathological personality traits.
• Impulsivity, aggressiveness, and novelty seeking clustered with all Cluster B PDs.
• Impulsive traits were linked to Borderline PD; aggressiveness differentiated Narcissistic from Antisocial PD; sensation seeking related to Histrionic PD.

Conclusions:

• Impulsive and aggressive traits are integral to understanding the spectrum of Cluster B PDs.
• These traits help explain the comorbidity and clinical heterogeneity observed in Cluster B PDs.
• Identifying specific trait-disorder links can refine diagnostic and therapeutic approaches.