| Autor: |
Dmitrova, E. D., Dubrovinskaya, N. V., Lukashevich, I. P., Machinskaya, R. I., Shklovskii, V. M. |
| Zdroj: |
Human Physiology; March 2005, Vol. 31 Issue: 2 p125-131, 7p |
| Abstrakt: |
Abstract Comprehensive neuropsychological and electroencephalographic examination of children with dysgraphia and dyslexia demonstrated local EEG anomalies in various zones of the cortex in both hemispheres, mainly in the posterotemporal and/or anterior regions of the left and the posterotemporal regions of the right hemisphere. The character of speech disturbances depended considerably on the localization of the baseline EEG anomalies: disturbances of motor components of writing prevailed when these anomalies were localized in the anterior parts of the left hemisphere, while phonological and morphological speech disturbances were noted in children with local anomalies in the temporal regions of both hemispheres and in posterior association regions, mainly in the right hemisphere. Spectral and correlation analyses of the EEG demonstrated the features of the cerebral organization of verbal activity in children with dysgraphia and dyslexia, namely, weakened intra- and interhemispheric integration of electrical activity of different regions of the brain cortex, particularly temporal and posterior association regions, and predominance of integration based on low-frequency EEG components (? and a1), unlike children without learning disabilities, in whom functional integration of cortical zones involved high-frequency rhythms (a2 and ß). On the whole, the results of the study testify to an important role of systemic interactions between the regions of the cortex of both hemispheres in the formation of verbal activity. |
| Databáze: |
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