The Multidimensional Personality Questionnaire's inconsistency scales identify invalid profiles through internal...

Area of Science:

• Psychological assessment
• Personality psychology
• Psychometrics

Background:

• Personality assessment relies on valid self-reports.
• Inconsistency scales, like VRIN and TRIN, aim to detect invalid response styles.
• The Multidimensional Personality Questionnaire's brief form (MPQ-BF) includes such scales.

Purpose of the Study:

• To investigate the characteristics of invalid personality profiles identified by VRIN and TRIN scales.
• To compare valid and invalid profiles from the MPQ-BF in a clinical setting.
• To determine the utility of inconsistency scales in personality assessment.

Main Methods:

• Analyzed data from 1,258 emergency department patients.
• Utilized Variable Response Inconsistency (VRIN) and True Response Inconsistency (TRIN) scales of the MPQ-BF.
• Compared personality trait scores and structural consistency between valid (n=1,026) and invalid (n=132) profiles.

Main Results:

• Invalid profiles exhibited lower internal consistency and score variability, particularly with random and acquiescent response styles.
• Random response profiles showed greater psychological maladjustment.
• Acquiescent profiles generally had higher scores, and counteracquiescent profiles had lower scores compared to valid profiles.
• Component structure of invalid profiles was less consistent with established models, though negative emotionality was preserved.
• Correlations between personality traits and demographics were weaker for invalid profiles.

Conclusions:

• Inconsistency scales (VRIN, TRIN) meaningfully differentiate valid from invalid personality profiles.
• Invalid profiles present distinct response patterns and psychometric properties.
• These findings support the use of inconsistency scales for enhancing the validity of personality assessments.