title: Electrophysiological subtypes of psychotic states.
abstract: OBJECTIVE
  This research sought neurobiological features common to psychotic states displayed by patients with different clinical diagnoses.
  
  
  METHODS
  Cluster analysis with quantitative electroencephalographic (QEEG) variables was used to subtype drug-naïve, non-medicated, and medicated schizophrenic, depressed and alcoholic patients with psychotic symptoms, from the USA and Germany. QEEG source localization brain images were computed for each cluster.
  
  
  RESULTS
  Psychotic patients with schizophrenia, depression and alcoholism, and drug- naïve schizophrenic patients, were distributed among six clusters. QEEG images revealed one set of brain regions differentially upregulated in each cluster and another group of structures downregulated in the same way in every cluster.
  
  
  CONCLUSIONS
  Subtypes previously found among 94 schizophrenic patients were replicated in a sample of 390 non-schizophrenic as well as schizophrenic psychotics, and displayed common neurobiological abnormalities. Collaborative longitudinal studies using these economical methods might improve differential understanding and treatment of patients based upon these features rather than clinical symptoms.
authors.affiliation: Brain Research Laboratories, Department of Psychiatry, New York University School of Medicine, New York, NY 10016, USA. johnr01@med.nyu.edu
authors.forename: E R
authors.initials: ER
authors.lastname: John
authors.forename: L S
authors.initials: LS
authors.lastname: Prichep
authors.forename: G
authors.initials: G
authors.lastname: Winterer
authors.forename: W M
authors.initials: WM
authors.lastname: Herrmann
authors.forename: F
authors.initials: F
authors.lastname: diMichele
authors.forename: J
authors.initials: J
authors.lastname: Halper
authors.forename: T G
authors.initials: TG
authors.lastname: Bolwig
authors.forename: R
authors.initials: R
authors.lastname: Cancro
mesh_terms: D000437:Alcoholism / Q000453:epidemiology* / Q000503:physiopathology / Q000523:psychology; D001921:Brain / Q000503:physiopathology*; D003863:Depression / Q000453:epidemiology* / Q000503:physiopathology / Q000523:psychology; D004569:Electroencephalography; D006801:Humans; D011618:Psychotic Disorders / Q000145:classification* / Q000188:drug therapy / Q000503:physiopathology*; D012559:Schizophrenia / Q000145:classification* / Q000188:drug therapy / Q000503:physiopathology*