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Data from our own cross-sectional MRI work has identified bilaterally smaller hippocampal volumes in first-episode and chronic schizophrenia, while "high-risk" mindividuals did not eiffer from normal controls. This finding calls into question the neurodevelopmental hypothesis of schizophrenia.'H Proton MRS provides measures of neuronal integrity and density (NAA) while choline represents a major component of the myelin in the brain. Using MRS this study will examine the neural and non-neuronal elements of the hippocampus to assess the relative contribution of these elements to changes in hippocampal volume. This study will examine 30 patients from three groups ("high-risk, first-episode, chronic schizophrenia) and matched healthy controls. The high-risk group and 15 controls will be re-assessed after the onset of psychosis. Patients will be recruited from EPPIC and PACE clinics at Orygen Youth Health. Controls will be recruited via an database established from previous research. Subjects
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