EEG coherence during hemispheric activation in schizophrenics

We studied the change of EEG alpha-band coherence between resting and motor performance ("reactivity of EEG coherence") in 18 chronic schizophrenics and 30 normal controls, examining differences between left and right hemisphere tasks. Three coherences were examined for each hemisphere. Th...

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Bibliographic Details
Published in:European archives of psychiatry and clinical neuroscience 1991-01, Vol.241 (1), p.31-34
Main Authors: Michelogiannis, S, Paritsis, N, Trikas, P
Format: Article
Language:English
Subjects:
Adult
Alpha Rhythm
Arousal - physiology
Brain Mapping - instrumentation
Cerebral Cortex - physiopathology
Dominance, Cerebral - physiology
Electroencephalography - instrumentation
Female
Humans
Male
Psychiatric Status Rating Scales
Schizophrenia - physiopathology
Schizophrenic Psychology
Signal Processing, Computer-Assisted - instrumentation
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Summary:We studied the change of EEG alpha-band coherence between resting and motor performance ("reactivity of EEG coherence") in 18 chronic schizophrenics and 30 normal controls, examining differences between left and right hemisphere tasks. Three coherences were examined for each hemisphere. The central-parietal coherence in normals increased on the left for left hemisphere tasks, and decreased on the right for right hemisphere tasks, whereas the patients showed a decrease of both measures, more on the left side. Thus, the interhemispheric difference of central-parietal coherence reactivity was reversed for the schizophrenics (P less than 0.06) and suggested a left-sided deviation. The lateral-percentral and precentral-central coherences showed no left-right deviations of reactivity in the patients. Since coherence increase is considered to be a sign of the coupled function between the studied regions, our findings suggest a defective coordination of left central-parietal regions during a task in schizophrenics.
ISSN:0940-1334
1433-8491
DOI:10.1007/bf02193751