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Updated: Feb 11, 2026

Signal Attenuation as a Rat Model of Obsessive Compulsive Disorder
Published on: January 9, 2015
Hippocampus volume alterations and the clinical correlates in medication naïve obsessive compulsive disorder
Sandeep Rao1, Dhanya Raveendranathan2, Venkataram Shivakumar1
1Translational Psychiatry Laboratory, National Institute of Mental Health and Neurosciences (NIMHANS), Bangalore, India.
Background:
Converging evidence suggests the role of hippocampus in the pathophysiology of Obsessive-Compulsive Disorder (OCD). The role of hippocampus, which might have a cardinal role in the neurobiology of OCD through its mediating effect on various cognitive and affective processes, needs further investigation. This study is a region-of-interest analysis of hippocampal volume and its clinical correlates in a medication-naïve sample with low comorbidity rate.
Method:
T1 weighted MRI (1.5T) was analysed for medication-naive DSM IV OCD patients (n = 26) patients and 20 age and sex matched healthy controls (HC) using a region-of-interest (ROI) method separately for the anterior and posterior subdivisions of hippocampus.
Results:
We found significantly greater left hippocampus volume compared to healthy controls. Furthermore, the severity of the compulsion score and the left posterior hippocampus volume demonstrated a significant negative correlation among the OCD patients.
Limitation:
Modest sample size precludes examination of the effect of symptom dimensions on hippocampal volume.
Conclusions:
The study results highlight the role of hippocampus in the neurobiological basis of OCD and in mediation of the illness severity.
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