Increased fronto-striatal reward prediction errors moderate decision making in obsessive-compulsive disorder

Area of Science:

• Neuroscience
• Cognitive Psychology
• Psychiatry

Background:

• Obsessive-compulsive disorder (OCD) is associated with fronto-striatal network dysfunction.
• Impaired decision-making and learning are characteristic of OCD.
• Neurocognitive mechanisms underlying these deficits remain unclear.

Purpose of the Study:

• Investigate neural mechanisms of decision-making in OCD.
• Examine reward prediction errors (RPEs) in OCD patients.
• Relate RPEs to fronto-striatal network function.

Main Methods:

• Used functional magnetic resonance imaging (fMRI) to study RPEs in OCD patients and controls.
• Applied reinforcement learning models to analyze behavioral parameters and neural RPE signals.
• Included early and late onset OCD patient groups.

Main Results:

• OCD patients showed significantly increased RPE responses in the anterior cingulate cortex (ACC) and putamen compared to controls.
• OCD patients exhibited a lower perseveration parameter.
• Neural RPE signals differed significantly between groups.

Conclusions:

• Enhanced RPE signals in ACC and putamen confirm fronto-striatal deficits in OCD.
• Abnormally strong RPEs suggest a hyper-responsive learning network in OCD.
• This hyper-responsivity may explain indecisiveness and intolerance of uncertainty in OCD.