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Magnetic Resonance Imaging of the Thalamus in First-Episode Psychosis

OBJECTIVE: There is some evidence of thalamic abnormalities in schizophrenia. This study investigated thalamic volumes in patients experiencing their first episode of psychosis and nonpsychotic comparison subjects. METHOD: Magnetic resonance imaging scans were obtained for 38 patients and 29 comparison subjects. Patients’ symptoms were rated by research psychiatrists using the Positive and Negative Syndrome Scale. RESULTS: Thalamic volumes were smaller in patients than in comparison subjects. There were no significant correlations between thalamic volumes and symptom scores. CONCLUSIONS: Thalamic abnormalities are present close to the onset of psychosis.

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