title: Effect of ketamine on the neuromagnetic mismatch field in healthy humans.
abstract: Mismatch negativity (MMN) is a component of the auditory evoked event-related potentials (ERP) that assesses automatic sound change detection and is disturbed in schizophrenic patients. Animal experimental evidence has linked the generation of MMN to the N-methyl-D-aspartate (NMDA) receptor. We investigated the neuromagnetic mismatch field (MMF) in healthy volunteers before and after intravenous application of a subanesthetic dose of the NMDA receptor antagonist ketamine (0.3 mg/kg). Ketamine had a significant influence on latency and dipole moment of the MMF, whereas the N100m latency of the standard tone was not prolonged and its dipole moment remained stable. Our results suggest that ketamine interferes with aspects of preattentive information processing and is in line with the view that disturbed NMDA receptor function may mediate the deficient auditory mismatch response in patients with schizophrenia.
authors.affiliation: Department of Psychiatry, Friedrich-Schiller-University, D-07740 Jena, Germany. ilonka.kreitschmann@post.rwth-aachen.de
authors.forename: I
authors.initials: I
authors.lastname: Kreitschmann-Andermahr
authors.forename: T
authors.initials: T
authors.lastname: Rosburg
authors.forename: U
authors.initials: U
authors.lastname: Demme
authors.forename: E
authors.initials: E
authors.lastname: Gaser
authors.forename: H
authors.initials: H
authors.lastname: Nowak
authors.forename: H
authors.initials: H
authors.lastname: Sauer
mesh_terms: D000161:Acoustic Stimulation; D000328:Adult; D005072:Evoked Potentials, Auditory / Q000187:drug effects*; D018691:Excitatory Amino Acid Antagonists / Q000097:blood / Q000494:pharmacology*; D005260:Female; D006213:Hallucinogens / Q000494:pharmacology; D006801:Humans; D007649:Ketamine / Q000097:blood / Q000494:pharmacology*; D015225:Magnetoencephalography; D008297:Male; D011597:Psychomotor Performance / Q000187:drug effects; D016194:Receptors, N-Methyl-D-Aspartate / Q000037:antagonists & inhibitors
chemical_list: D018691:Excitatory Amino Acid Antagonists; D006213:Hallucinogens; D016194:Receptors, N-Methyl-D-Aspartate; D007649:Ketamine