Specific features of brain electrical activity of children aged with obtained visual dysfunction at 8-12 years
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Abstract
The peak frequency, absolute and relative spectral power of 5 frequency band of EEG were studied in 45 children with obtained visual dysfunctions and 49 sighted children at 8-12 years. The spectral analysis of the EEG signal was done with high resolution.
A specific feature of the electrical brain activity of children with obtained visual dysfunction during eyes-closed resting state was characterized by decrease of relative spectral power (RSP) in the beta-1 band. This was observed in the frontal and parietal brain areas of boys and throughout convexital brain cortex of girls. Boys with obtained visual dysfunction was had the decrease of RSP in the alpha-band and increase of RSP in the theta- and delta- bands in the right occipital area, as well as increasing of RSP in beta-2 band in the left occipital area.
Late obtained visual dysfunction was associated by a decrease of activity of thalamic alpha-bands’ generators and decrease of activity of midbrain reticular formation. As well the boys with obtained visual dysfunction was had increased activity of limbic-reticular complex. Late obtained visual dysfunction was associated by a decrease of electrical activity in striate cortex as well as increased neuronal excitability extrastriate cortex. This phenomenon was more typical by boys.
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