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Rockstroh, Brigitte; Kissler, Johanna; Mohr, Bettina; Eulitz, Carsten; Lommen, Ursula; Wienbruch, Christian; Cohen, Rudolf; Elbert, Thomas
Biological psychiatry (1969), 04/2001, Letnik: 49, Številka: 8Journal Article
Background: A growing body of literature suggests that schizophrenic patients often do not show the normal brain hemispheric asymmetry. We have found this for simple tones presented to the right ear in a previous study. In this study we extended this investigation to left ear stimulation and verbal stimuli. Methods: With a whole-head neuromagnetometer, contra- and ipsilateral auditory-evoked magnetic fields in response to tones (1000 Hz) and to the syllables (“ba”) delivered to the left and right ears in separate runs were compared between schizophrenic patients ( n = 17) and healthy control subjects ( n = 15). Results: In response to tones, all control subjects showed the expected asymmetry (contralateral predominance) of the auditory-evoked magnetic N100m (dipole moment). In the patient sample asymmetry was reversed following tones presented to the left ear in 47% and following tones to the right ear in 24%. In response to syllables, the asymmetry was similar between groups. In patients compared with control subjects the N100m was located more anterior without asymmetry between hemispheres. Conclusions: Results suggest that deviation from the normal functional lateralization in schizophrenia appears in a proportion of patients at a basic stage of auditory processing, but may be compensated for at higher levels such as the processing of syllables.
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