Enhanced action tendencies in obsessive-compulsive disorder: An ERP study

Area of Science:

• Neuroscience
• Psychiatry
• Cognitive Psychology

Background:

• Obsessive-compulsive disorder (OCD) involves repetitive thoughts and behaviors.
• Understanding the neural underpinnings of action control in OCD is crucial.

Purpose of the Study:

• To investigate if OCD is associated with enhanced action tendencies.
• To examine motor response preparation in individuals with OCD using electroencephalography.

Main Methods:

• Utilized a go/no-go and stop-signal task with schematic faces (angry, neutral).
• Recorded event-related potentials (ERPs), specifically the readiness potential (RP), in 15 OCD participants and 16 healthy controls.
• Analyzed RP slope gradient and amplitude over frontoparietal motor areas.

Main Results:

• The OCD group exhibited a greater RP slope gradient and amplitude compared to controls.
• This effect was amplified when participants viewed angry faces (negative valence) versus neutral faces.
• Findings correlated specifically with OCD symptoms, not anxiety or depression.

Conclusions:

• Results support the hypothesis of heightened readiness for action in OCD, especially with threatening stimuli.
• Early motor preparation stages may contribute to the etiology and maintenance of OCD.
• These findings may explain habitual behaviors and embodiment tendencies observed in OCD.