Antisaccade task performance in obsessive-compulsive disorder and its clinical correlates.

Area of Science:

• Neuroscience
• Psychiatry
• Ophthalmology

Background:

• Obsessive-Compulsive Disorder (OCD) is linked to abnormalities in the brain's cortico-striato-thalamo-cortical (CSTC) circuitry.
• Antisaccade eye movement tasks assess voluntary behavioral control, which is sensitive to CSTC circuitry function.

Purpose of the Study:

• To investigate antisaccade eye movement parameters in individuals with OCD compared to healthy controls.
• To determine the relationship between antisaccade performance and OCD symptom severity.

Main Methods:

• Compared antisaccade performance in right-handed OCD patients (N=65) and matched right-handed healthy controls (HC, N=57).
• Utilized an Eye-Link eye-tracker (1000-Hz sampling rate) to collect eye-tracking data during the task.
• Assessed OCD symptom severity using the Yale-Brown Obsessive Compulsive Scale.

Main Results:

• OCD patients exhibited a significantly higher percentage of antisaccade errors compared to HC (p < 0.001).
• OCD patients demonstrated less accurate final eye positioning than HC (p < 0.001).
• No significant correlations were found between antisaccade parameters and OCD severity measures.

Conclusions:

• Impaired antisaccade task performance in OCD supports the hypothesis of CSTC circuitry abnormalities.
• The observed deficits in antisaccade performance appear to be independent of OCD illness severity.
• Further research in remitted OCD participants and unaffected relatives could validate endophenotype findings.