The Dot Counting Test adds up: Validation and response pattern analysis in a mixed clinical veteran sample

Area of Science:

• Neuropsychology
• Clinical Psychology
• Forensic Psychology

Background:

• Performance validity tests (PVTs) are crucial for detecting noncredible effort in clinical evaluations.
• The Dot Counting Test (DCT) is a non-memory-based PVT requiring further validation in diverse clinical samples.
• Veteran populations present unique challenges for performance assessment due to potential cognitive and psychological comorbidities.

Purpose of the Study:

• To cross-validate the Dot Counting Test (DCT) as a performance validity test (PVT) in a mixed clinical veteran sample.
• To examine the influence of cognitive impairment on DCT performance, including completion time and error patterns.
• To determine the diagnostic accuracy of the DCT in identifying noncredible responding within this population.

Main Methods:

• A cross-sectional study involving 77 veterans who completed the DCT during clinical evaluation.
• Participants were classified as valid (74%) or noncredible (26%) using established PVTs (Word Memory Test and Test of Memory Malingering).
• Cognitive impairment status was assessed, and DCT completion times and error scores (E-scores) were analyzed by validity and cognitive groups.

Main Results:

• The DCT demonstrated significant differences in completion times and error rates between valid and noncredible participants.
• Noncredible individuals exhibited longer completion times, more errors, and higher E-scores compared to valid participants.
• DCT E-scores accurately predicted group membership (83.1% accuracy, AUC=.87), with an optimal cut-score of 15 yielding 70% sensitivity and 88% specificity.

Conclusions:

• The Dot Counting Test (DCT) is a valid and reliable performance validity test (PVT) for use with mixed clinical veteran samples.
• The DCT effectively distinguishes between credible and noncredible responding, even in the presence of cognitive impairment.
• Findings support the DCT's utility as a non-memory-based PVT, contributing valuable data to neuropsychological assessments in veteran populations.