Development of Posterior Medial Frontal Cortex Function in Pediatric Obsessive-Compulsive Disorder

Area of Science:

• Neuroscience
• Developmental Psychology
• Psychiatry

Background:

• Abnormal posterior medial frontal cortex (pMFC) engagement is observed in obsessive-compulsive disorder (OCD) during performance monitoring.
• The developmental trajectory of pMFC function in youth with OCD is not well understood.

Purpose of the Study:

• To investigate the developmental changes in pMFC activity during error processing in pediatric OCD patients compared to healthy controls.
• To examine the relationship between pMFC function, age, performance, and symptom severity in pediatric OCD.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to scan 69 pediatric OCD patients and 72 healthy controls (ages 8-19) during the Multisource Interference Task (MSIT).
• Region of interest (ROI) and whole-brain analyses focused on pMFC and bilateral anterior insula/frontal operculum (aI/fO) to assess responses to errors and interference.
• Statistical analyses examined group, age, performance, and interaction effects on neural activity.

Main Results:

• OCD patients exhibited greater error-related pMFC activity than controls, which increased with age in OCD patients but decreased in controls.
• In healthy controls, greater pMFC activation correlated with better performance, a link absent in OCD patients.
• In OCD patients, heightened pMFC error activation was associated with lower symptom severity, and altered activation in the right aI/fO and left aI/fO was linked to symptom severity.

Conclusions:

• The findings suggest an atypical developmental trajectory of pMFC function in pediatric OCD, characterized by an increased response to errors that may be adaptive.
• Heightened pMFC response to errors, associated with better performance in controls and lower symptom severity in OCD patients, indicates potential for therapeutic enhancement via cognitive training for improved outcomes in early-stage illness.