Comparative Analysis of Cognitive Function in Schizophrenia with and without Obsessive Compulsive Disorder

Area of Science:

• Neuroscience
• Psychiatry
• Cognitive Psychology

Background:

• Schizophrenia is often associated with significant neurocognitive deficits.
• The presence of comorbid obsessive-compulsive disorder (OCD) in schizophrenia may influence cognitive profiles.

Purpose of the Study:

• To investigate and compare neurocognitive deficits in schizophrenic patients with and without OCD.
• To explore the potential impact of OCD on cognitive functions in schizophrenia.

Main Methods:

• 27 schizophrenia patients were divided into OCD and non-OCD groups.
• Cognitive assessments included IQ, memory quotient (MQ), and executive intelligence quotient (EIQ) using standardized tests.
• Symptom severity was measured using the Yale-Brown Obsessive-Compulsive Scale (Y-BOCS) and Positive and Negative Symptom Scale (PANSS).

Main Results:

• Patients with schizophrenia and OCD (10 of 27) exhibited higher IQs compared to those without OCD.
• No significant differences were observed in memory quotient (MQ) between the groups.
• Despite similar executive intelligence quotient (EIQ) scores, the OCD group performed better on Stroop-interference and verbal fluency tests, indicating preserved executive functions.

Conclusions:

• Obsessive-compulsive disorder may exert a protective effect on certain cognitive functions in schizophrenia, particularly in the early stages of the illness.
• Schizophrenia with comorbid OCD may represent a distinct subtype based on clinical and neurocognitive characteristics.