During error-processing, patients with pediatric OCD (A) and healthy subjects (B) activated the pMFC. Deactivation of the vMFC was also observed in healthy youth (B). Patients exhibited greater error-related activation of the vMFC (C) than healthy youth. Parameter estimates for error, incongruent and congruent trials relative to implicit baseline (i.e., fixation) were extracted from the vMFC for patients (shown in red) and controls (shown in blue); estimates were positive for patients (i.e., activation), but negative for healthy youth (i.e., deactivation) across both error and incongruent trials (D).