Abstract
Preclinical studies suggest that ketamine-induced psychopathology is mediated, in part, by increased glutamate release, hypothesized to occur via inhibition of GABAergic interneurons. Using proton magnetic resonance spectroscopy (1H-MRS), we tested this hypothesis in healthy humans. Ketamine increased anterior cingulate cortex glutamate levels, which correlated with the degree of positive psychotic symptoms. Ketamine did not affect subcortical gamma-aminobutyric acid (GABA) levels.
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