Clinical Characteristics of Cognitive Subgroups of Obsessive Compulsive Disorder

Area of Science:

• Neuroscience
• Psychiatry
• Cognitive Psychology

Background:

• Obsessive-compulsive disorder (OCD) is characterized by significant clinical heterogeneity.
• Previous symptom-based classifications have yielded inconsistent results in resolving this heterogeneity.
• Neurocognitive performance may offer a more effective basis for classifying OCD subtypes.

Purpose of the Study:

• To investigate clinical differences between obsessive-compulsive disorder (OCD) patient subgroups defined by neurocognitive performance.
• To explore potential neurobiological underpinnings of identified cognitive clusters in OCD.

Main Methods:

• Combined data from three prior studies, including 135 OCD outpatients and 106 healthy controls (HCs).
• Utilized the 17-Item Hamilton Depression Rating Scale (HDRS-17), Yale-Brown Obsessive Compulsive Scale (Y-BOCS), and a comprehensive neuropsychological battery.
• Employed k-means cluster analysis to identify neurocognitive subgroups.

Main Results:

• Two neurocognitive subgroups were identified: globally impaired (GI) and cognitively intact (CI).
• The GI subgroup exhibited significantly worse performance across all neurocognitive tests compared to HCs and the CI group.
• The GI group showed higher compulsive symptom severity, Y-BOCS scores, and earlier age of onset, with lower educational attainment than the CI group.

Conclusions:

• The identified neurocognitive clusters suggest potential subtypes of OCD with distinct neurobiological bases.
• Further research into the cognitive structure of OCD could aid in genetic and neuroimaging studies.
• Dissecting cognitive profiles may lead to more targeted diagnostic and therapeutic strategies for OCD.