Continuous performance test in pediatric obsessive-compulsive disorder and tic disorders: the role of sustained...

Area of Science:

• Child and Adolescent Psychiatry
• Neurodevelopmental Disorders
• Cognitive Neuroscience

Background:

• Pediatric obsessive-compulsive disorder (OCD) and tic disorders (TD) frequently co-occur with attention-deficit hyperactivity disorder (ADHD).
• Understanding the specific cognitive deficits, particularly in attention and inhibitory control, is crucial for differentiating these conditions.
• Previous research suggests overlapping but not identical cognitive profiles in these pediatric populations.

Purpose of the Study:

• To investigate the role of attention and inhibitory control in children and adolescents diagnosed with OCD alone, TD alone, or comorbid OCD and TD.
• To compare cognitive performance, specifically using a continuous performance test, across these distinct clinical groups.
• To identify cognitive markers associated with the combined presentation of OCD and TD.

Main Methods:

• A clinical cohort of 48 children and adolescents was assessed, divided into groups: OCD alone (n=20), TD alone (n=15), and OCD+TD (n=13).
• Participants underwent clinical interviews and completed the Conners Continuous Performance Test II (CPT-II), a 14-minute computerized assessment.
• The CPT-II evaluated attention, inhibitory control, and sustained attention, measuring errors of omission, commission, and response variability, with diagnoses based on DSM-IV criteria.

Main Results:

• The OCD+TD group exhibited significantly more errors of omission (distractibility) and greater variability in reaction times (hit RT block change, hit SE block change) compared to the OCD alone and TD alone groups.
• These deficits in sustained attention were correlated with younger age and the presence of hoarding symptoms.
• A formal clinical diagnosis of ADHD within the OCD+TD group was associated with poorer sustained attention performance.

Conclusions:

• A deficit in sustained attention, a hallmark of ADHD, is also evident in children with comorbid OCD and TD, distinguishing them from those with only OCD or only TD.
• These findings suggest that sustained attention deficits may represent a shared or overlapping neurobiological pathway in these conditions.
• Further genetic and neuroimaging studies focusing on the biological correlates of sustained attention could elucidate the pathophysiology underlying OCD and TD.