Indicators of Impulsivity in Routine Clinical Assessment of Adult ADHD

Area of Science:

• Psychology
• Neuroscience
• Clinical Psychiatry

Background:

• Impulsivity is a core symptom of adult attention-deficit/hyperactivity disorder (ADHD).
• Existing research suggests impulsivity in ADHD is not a single trait but a complex construct.
• Understanding the structure of impulsivity is crucial for accurate ADHD assessment and treatment.

Purpose of the Study:

• To examine a proposed three-factor model of impulsivity in adults with ADHD.
• To differentiate between self-reported impulsivity, commission errors, and reaction time measures.
• To investigate the relationship between these impulsivity dimensions and clinical/demographic factors.

Main Methods:

• Confirmatory factor analyses were performed on data from 654 adults undergoing ADHD assessment.
• A three-factor model including Barratt Impulsiveness Scale, commission errors, and reaction time measures was tested.
• Network analysis was used to explore alternative conceptualizations of impulsivity.

Main Results:

• The proposed three-factor model of impulsivity (self-report, commission errors, reaction time) was consistently supported.
• Network analysis suggested a two-group structure separating performance-based from self-report measures.
• Self-reported impulsivity showed the highest severity, followed by commission errors; reaction times were least affected.
• Clinical and demographic factors predicted self-reports and commission errors but not reaction times.

Conclusions:

• Impulsivity in adult ADHD is best understood as a multidimensional construct, not a unitary trait.
• Self-report measures of impulsivity should be interpreted independently from performance-based neuropsychological tests.
• Clinical assessments may benefit from targeted measures, as some performance-based tasks may yield redundant information.