Decoding moral emotions in obsessive-compulsive disorder.

Area of Science:

• Neuroscience
• Psychiatry
• Brain Imaging

Background:

• Obsessive-compulsive disorder (OCD) is associated with abnormal neural responses to emotional stimuli.
• The distinctiveness of these neural responses for differentiating OCD patients from healthy controls remains unclear.
• Previous research has not utilized multivariate pattern analysis to assess the discriminative power of fMRI responses to emotions in OCD.

Purpose of the Study:

• To investigate the discriminative power of multivariate pattern analysis of regional fMRI responses to moral and non-moral emotions in OCD.
• To identify brain regions capable of discriminating between OCD patients and healthy controls based on emotional processing.

Main Methods:

• Searchlight-based multivariate pattern analysis was employed on fMRI data.
• 18 OCD patients and 18 matched healthy controls were analyzed during provoked guilt, disgust, compassion, and anger.
• A multiemotion analysis combined responses to all four emotions to identify distinctive neural patterns.

Main Results:

• Frontostriatal regions, including the left nucleus accumbens (NAcc), discriminated OCD patients from controls during disgust and multiemotion analyses.
• The angular gyrus showed discriminant responses to anger in OCD patients.
• Lingual and middle temporal gyri responses were highly discriminant in the multiemotion analysis.

Conclusions:

• Differential neural activity beyond frontostriatal areas distinguishes OCD patients from healthy volunteers.
• The left NAcc's response to various emotions is highly discriminative for OCD diagnosis.
• Findings support current pathophysiological models of OCD and suggest new research directions.