Summary
A study was made in children aged 11–15 yr of the potentials induced in the right and left hemispheres before and after 5–6 hr of mental work in the classroom. The EEG was analyzed by a modification of Lowell and Dossett's method to determine the coefficient of synchronization (Ks) and the energy of the synchronized oscillations (ΣAs) for each flash frequency. It appeared that, from these two indices in the majority of observations, a moderate asymmetry was present before the mental work was commenced, the indices being greater for the left hemisphere. After mental work when the brain was no longer optimally excitable, the asymmetry showed both a quantitative and qualitative increase. The values of the Ks and ΣAs indices were now no longer greater on the left, but greater for the right hemisphere. We think that this change of synchronization is another aspect of the dynamic changes in the cortex which we have previously described as taking place after similar mental work in a comparable age group.
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Pratusevich, Y.M., Khoruzhaya, S.D. Changes of electricla reactivity of the right and left cerebral hemispheres in school children after 5–6 hours mental work. Bull Exp Biol Med 55, 124–127 (1964). https://doi.org/10.1007/BF00798812
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DOI: https://doi.org/10.1007/BF00798812