Ketamine activates psychosis and alters limbic blood flow in schizophrenia

A. C. Lahti, H. H. Holcomb, D. R. Medoff, C. A. Tamminga

Research output: Contribution to journalArticlepeer-review

360 Scopus citations


The non-competitive NMDA antagonist ketamine, given to schizophrenic individuals in subanesthetic doses, produced a short-lived, discrete activation of their psychotic symptoms, which had striking similarities to symptoms of their usual psychotic episodes. To further study this psychotomimetic property of ketamine, we administered 0.3 mg kg−1 of the drug to schizophrenic individuals during a [15O] water cerebral blood flow study. Regional cerebral blood flow (rCBF) was measured using H215O and positron emission tomography (PET) before and after ketamine administration to identify regions of flow change. rCBF was increased in anterior cingulate cortex and was reduced in the hippocampus and primary visual cortex (lingual and fusiform gyri). These data encourage further consideration of altered glutamatergic transmission in schizophrenic and PCP-induced psychoses.

Original languageEnglish (US)
Pages (from-to)869-872
Number of pages4
Issue number6
StatePublished - Apr 1995


  • Cerebral blood flow
  • Cingulate
  • Glutamate
  • Hippocampus
  • Ketamine
  • Psychosis
  • Schizophrenia

ASJC Scopus subject areas

  • Neuroscience(all)


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