The contingency of the variations in the amplitude frequency parameters of the main modes of extremely-low-frequency resonances ionosphere waveguide (Shuman resonances) and changes in the parameters of human electroencephalograms in the range of the frequency "window" (6-16 Hz) was studied. The results of studies in the regimes of synchronized monitoring suggest that the contingency of the parameters of electroencephalograms and extremely-low-frequency resonances, expressed in the parameters of the cross-correlation function, is statistically significant and varies from 0.12 to 0.65 at alpha = 0.95. It was found that the magnitude of contingency is largely the function of the current value of the solar and geomagnetic activity.
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