Chronic medication does not affect hyperactive error responses in obsessive-compulsive disorder.

Area of Science:

• Neuroscience
• Clinical Psychology
• Psychiatry

Background:

• Obsessive-compulsive disorder (OCD) is associated with altered performance monitoring.
• Previous research noted increased error-related negativity (ERN) in OCD, but medication effects were not controlled.
• Serotonin system alterations in OCD may influence performance monitoring.

Purpose of the Study:

• To investigate the error-related negativity (ERN) in obsessive-compulsive disorder (OCD) patients, controlling for medication status.
• To determine if medication influences the ERN in OCD.
• To explore the relationship between ERN amplitude and anxiety/depression severity in OCD patients versus controls.

Main Methods:

• Compared ERN amplitudes in four groups: unmedicated OCD patients, medicated OCD patients, medicated patient controls, and unmedicated healthy controls.
• Utilized electroencephalography (EEG) to measure ERN.
• Assessed severity of generalized anxiety and depression.

Main Results:

• OCD patients exhibited significantly greater ERNs compared to all control groups, irrespective of medication.
• Medication status did not influence the ERN amplitude in OCD patients.
• In healthy controls, ERN amplitude correlated with anxiety and depression severity; this association was absent in OCD patients.

Conclusions:

• The exaggerated error response (ERN) is a robust finding in obsessive-compulsive disorder (OCD) and is not attributable to medication.
• Elevated error signals in OCD appear to be disorder-specific.
• The dissociation of ERN amplitude from anxiety/depression in OCD patients suggests unique neural mechanisms underlying error processing in this condition.