Borderline disorders--the validity of the diagnostic concept

Area of Science:

• Psychiatry
• Psychological Medicine
• Personality Disorders

Background:

• Establishing reliable diagnostic concepts is crucial for valid research into personality disorders.
• The study focuses on Borderline personality disorder (BPD) and Schizotypal personality disorder (SPD) as defined by DSM-III.

Purpose of the Study:

• To review and discuss the empirical evidence for the descriptive, construct, and predictive validity of BPD and SPD.
• To assess the strengths and weaknesses of existing research on these borderline concepts.

Main Methods:

• Literature review of empirical studies examining the validity of BPD and SPD definitions.
• Analysis of evidence pertaining to descriptive, construct, and predictive validity.

Main Results:

• Borderline personality disorder (BPD) demonstrates descriptive validity but lacks strong construct and predictive validity.
• Schizotypal personality disorder (SPD) exhibits both descriptive and construct validity, yet predictive validity remains insufficient.
• Identified limitations and strengths in the empirical research supporting these personality disorder concepts.

Conclusions:

• While BPD and SPD have established descriptive validity, further research is needed to strengthen their construct and predictive validity.
• The current empirical evidence suggests distinct validity profiles for BPD and SPD, highlighting areas for future investigation.