Dysfunctional reward circuitry in obsessive-compulsive disorder.

Area of Science:

• Neuroscience
• Psychiatry
• Neuroimaging

Background:

• Obsessive-compulsive disorder (OCD) shares features with addictive behaviors due to reward-seeking compulsions.
• Reward processing relies on the ventral striatal-orbitofrontal circuitry, often showing abnormalities in OCD.
• This study is the first functional imaging investigation focused on reward circuitry in OCD.

Purpose of the Study:

• To investigate reward circuitry function in individuals with OCD.
• To compare reward anticipation and receipt between OCD patients and healthy controls.
• To examine differences in reward processing between OCD subtypes (contamination fear vs. high-risk assessment).

Main Methods:

• Utilized a monetary incentive delay task and functional magnetic resonance imaging (fMRI).
• Compared brain activity during reward anticipation and receipt in 18 OCD patients and 19 healthy controls.
• Analyzed reward processing in OCD patients with contamination fears versus high-risk assessment.

Main Results:

• OCD patients demonstrated reduced nucleus accumbens activity during reward anticipation compared to controls.
• This reduced activity was more significant in OCD patients with contamination fears.
• Reward receipt activity was comparable between groups; preliminary findings suggested more dysfunction in treatment-resistant OCD.

Conclusions:

• Altered nucleus accumbens activation during reward anticipation may impair decision-making in OCD patients.
• Findings support the conceptualization of OCD as a disorder involving reward processing deficits and behavioral addiction.
• This research highlights the role of the nucleus accumbens in OCD pathophysiology.