Spatial Patterns of Correlations between Amplitudes of the Main EEG Rhythms in Children in the Norm and with Central Disorders of Motor Activity

We recorded resting-state ongoing EEG in two groups of 8- to 12-year-old children, boys and girls, with no disorders in the motor sphere and with a clinically diagnosed form of cerebral palsy (control and CP groups, n = 100 and n = 78, respectively). The sign and intensity of correlations between values of the mean amplitudes of oscillations of the delta, theta, alpha, and beta rhythms in the pairs of eight recording sites were estimated. Recording electrodes were positioned in the frontal, temporal, parietal, and occipital loci of the left and right hemispheres (28 pairs of leads). Cases with the modulus of the correlation coefficient, ǀrǀ, 0.30–0.49, 0.50–0.69, and 0.70–0.99, respectively, were classified as those of weak, moderate, and strong correlation between the amplitudes. At ǀrǀ < 0.30, correlations were considered insignificant. Cases of significant direct (positive) and inverse (negative) correlations, including those with rather high r values, were observed in children of both examined groups, but the numbers of such correlations demonstrated certain intergroup differences. In children suffering from CP, such cases were met noticeably more frequently than in the control group. In boys and girls of the control group, the total number of significant (both direct and inverse) correlations between oscillations of the four above-mentioned rhythms, normalized with respect to the number of all lead pairs (n = 28), varied from 14 to 50%, and only in two cases among 16 (4 analyzed rhythms × 2 examined groups × × 2 gender subgroups) did it exceed 40%. In children with CP, this index varied between 32 and 68%, and only in two cases was it smaller than 40%. Patterns of correlations between amplitudes of the EEG rhythms in girls of both examined groups significantly differed from those in boys; girls were characterized by more frequent cases of inverse correlations.

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