Psychometric properties of impulsivity measures: temporal stability, validity and factor structure

Area of Science:

• Child Psychology
• Neurodevelopmental Disorders
• Behavioral Science

Background:

• Impulsivity is a complex construct with varying definitions and measures.
• Understanding the psychometric properties of impulsivity measures is crucial for accurate assessment in children.
• Differentiating between normal and behaviorally disordered children requires reliable and valid measures of impulsivity.

Purpose of the Study:

• To evaluate the temporal stability, discriminant validity, and factor structure of performance measures of impulsivity.
• To determine if these measures can differentiate between normal and behaviorally disordered children.
• To identify the underlying cognitive and motivational components of impulsivity.

Main Methods:

• Assessed temporal stability and discriminant validity of impulsivity measures.
• Utilized factor analysis to determine the factor structure of the measures.
• Included samples of normal (N=48) and behaviorally disordered children (N=88), ages 6-16.
• Controlled for intellectual aptitude and age in group comparisons.

Main Results:

• Only 31% of impulsivity measures met a conservative criterion for adequate temporal stability.
• Of the stable measures, 83% successfully discriminated between groups after controlling for covariates.
• Factor analysis revealed a two-factor solution representing cognitive (inhibitory control) and motivational (reward/punishment insensitivity) aspects of impulsivity.

Conclusions:

• Many common impulsivity measures lack sufficient temporal stability for reliable use in children.
• Validated measures can effectively discriminate between normal and behaviorally disordered children.
• Impulsivity in children appears to comprise distinct cognitive and motivational dimensions.