title: Abnormal intrinsic and extrinsic connectivity within the magnetic mismatch negativity brain network in schizophrenia: a preliminary study.
abstract: Altered neuroplasticity is increasingly invoked as a mechanism underpinning dysconnectivity in schizophrenia. We used Dynamic Causal Modelling to compare connectivity during the magnetic auditory Mismatch Negativity (MMN), an index of error prediction, between schizophrenia patients and controls. Patients showed reduced intrinsic connectivity within the primary auditory cortex suggestive of impaired local neuronal adaptation and disrupted forward and backward extrinsic connectivity throughout the MMN network indicative of reduced higher order input in disambiguating activity in lower network nodes. Our study provides the first empirical description of the dysplastic changes underpinning dysconnectivity between primary sensory and higher order cortical areas in schizophrenia.
authors.affiliation: Section of Neurobiology of Psychosis, Department of Psychosis Studies, Institute of Psychiatry, King's College London, De Crespigny Park, London SE5 8AF, UK. danai.dima@kcl.ac.uk
authors.forename: D
authors.initials: D
authors.lastname: Dima
authors.forename: S
authors.initials: S
authors.lastname: Frangou
authors.forename: L
authors.initials: L
authors.lastname: Burge
authors.forename: S
authors.initials: S
authors.lastname: Braeutigam
authors.forename: A C
authors.initials: AC
authors.lastname: James
mesh_terms: D000161:Acoustic Stimulation / Q000379:methods; D000293:Adolescent; D001306:Auditory Pathways / Q000503:physiopathology; D001921:Brain / Q000503:physiopathology*; D001931:Brain Mapping; D003265:Contingent Negative Variation / Q000502:physiology*; D004569:Electroencephalography; D005072:Evoked Potentials, Auditory / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008954:Models, Biological; D009483:Neuropsychological Tests; D012559:Schizophrenia / Q000473:pathology* / Q000503:physiopathology; D013997:Time Factors