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- W2020166486 abstract "The present study compares the amplitudes and topographic patterns of mismatch negativity (MMN) and N2b in schizophrenic patients and normal controls. Twenty-one schizophrenic outpatients and 19 normal volunteers participated in the study. Event-related potentials (ERPs) were recorded in a selective attention task. During the task, subjects were required to focus on one ear, counting deviant stimuli, those deviating in duration from a sequence of standard stimuli. MMN was significantly attenuated in the schizophrenics as compared with the normals in the frontocentral regions. In addition to MMN, the N2b amplitude was also reduced, which showed a significant correlation with the MMN amplitude in the schizophrenics. The late negativity elicited by the deviant stimuli in the unattended condition showed different topographical features between the groups. Whereas the normals showed a lateralized distribution with an ear-related asymmetry, similar to that of the N2b, the schizophrenics showed a frontal dominance, coinciding with the sustained negativity reported by Näätänen et al. (1982), which reflects the automatic preparation for detecting possible subsequent stimulus changes. The amplitude of the sustained negativity was significantly correlated with the performance level in the schizophrenics. The results indicated that although both preattentive and controlled processings are impaired, schizophrenic patients, presumably due to the deficient controlled processing, owe much to automatic processing in the deviant stimulus detection process." @default.
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- W2020166486 date "1995-04-01" @default.
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- W2020166486 title "Eye tracking and attentional measures in the finnish adoptive study of schizophrenia" @default.
- W2020166486 doi "https://doi.org/10.1016/0920-9964(95)95578-w" @default.
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