When repetitive mental sets increase cognitive flexibility in adolescent obsessive-compulsive disorder

Area of Science:

• Neuroscience
• Psychiatry
• Cognitive Psychology

Background:

• Obsessive-compulsive disorder (OCD) is often characterized by cognitive inflexibility.
• However, cognitive flexibility can sometimes be necessary to reinstate recently abandoned mental sets.
• This study investigates the counterintuitive hypothesis that cognitive flexibility may be superior in OCD patients under specific circumstances.

Purpose of the Study:

• To examine cognitive flexibility in adolescent OCD patients compared to controls.
• To investigate the neural underpinnings of cognitive flexibility in OCD using event-related potentials (ERPs).
• To explore the relationship between clinical symptom severity and neurophysiological modulations.

Main Methods:

• Utilized a backward inhibition (BI) paradigm with 20 adolescent OCD patients and 22 controls.
• Combined BI paradigm with event-related potential (ERP) recordings and source localization.
• Analyzed the BI effect, which measures the cost of overcoming inhibition of a recently abandoned mental set.

Main Results:

• OCD patients demonstrated a smaller backward inhibition effect compared to controls.
• EEG data showed larger P1 amplitudes in BI trials for the OCD group, linked to inferior frontal gyrus (BA47) activation.
• Clinical symptom severity predicted these neurophysiological differences, with high statistical power (95%).

Conclusions:

• Cognitive flexibility can be superior in OCD patients in situations requiring reactivation of previous mental sets.
• This enhanced flexibility may involve intensified inhibitory control mechanisms.
• Findings challenge the traditional view of OCD as solely associated with cognitive inflexibility.