Event-related potential P300 microstate topography during visual one- and two-dimensional tasks in chronic schizophrenics

Kochi, Kieko; Koenig, Thomas; Strik, Werner K.; Lehmann, Dietrich (1996). Event-related potential P300 microstate topography during visual one- and two-dimensional tasks in chronic schizophrenics. European archives of psychiatry and clinical neuroscience, 246(6), pp. 288-296. Springer 10.1007/BF02189021

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Reports on left-lateralized abnormalities of component P300 of event-related brain potentials (ERP) in schizophrenics typically did not vary task difficulties. We collected 16-channel ERP in 13 chronic, medicated schizophrenics (25±4.9 years) and 13 matched controls in a visual P300 paradigm with targets defined by one or two stimulus dimensions (C1: color; C2: color and tilt); subjects key-pressed to targets. The mean target-ERP map landscapes were assessed numerically by the locations of the positive and negative map-area centroids. The centroids' time-space trajectories were searched for the P300 microstate landscape defined by the positive centroid posterior of the negative centroid. At P300 microstate centre latencies in C1, patients' maps tended to a right shift of the positive centroid (p<0.10); in C2 the anterior centroid was more posterior (p<0.07) and the posterior (positive) centroid more anterior (p<0.03), but without leftright difference. Duration of P300 microstate in C2 was shorter in patients (232 vs 347 ms;p<0.03) and the latency of maximal strength of P300 microstate increased significantly in patients (C1: 459 vs 376 ms; C2: 585 vs 525 ms). In summary only the one-dimensional task C1 supported left-sided abnormalities; the two-dimensional task C2 produced abnormal P300 microstate map landscapes in schizophrenics, but no abnormal lateralization. Thus, information processing involved clearly aberrant neural populations in schizophrenics, different when processing one and two stimulus dimensions. The lack of lateralization in the two-dimensional task supported the view that left-temporal abnormality in schizophrenics is only one of several task-dependent aberrations.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > University Psychiatric Services > University Hospital of Psychiatry and Psychotherapy > Management
04 Faculty of Medicine > University Psychiatric Services > University Hospital of Psychiatry and Psychotherapy > Psychiatric Neurophysiology (discontinued)

UniBE Contributor:

König, Thomas and Strik, Werner

Subjects:

600 Technology > 610 Medicine & health

ISSN:

0940-1334

Publisher:

Springer

Language:

English

Submitter:

Thomas König

Date Deposited:

15 Aug 2014 12:16

Last Modified:

15 Aug 2014 12:16

Publisher DOI:

10.1007/BF02189021

PubMed ID:

8908410

Uncontrolled Keywords:

P300 microstate topography, Chronic schizophrenics, Lateralization, Task difficulty, ERP microstates

URI:

https://boris.unibe.ch/id/eprint/39717

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