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After unilateral electroshocks the following stages of the recovery of EEG may be defferentiated in man: residual seizure activity, flat EEG, low-amplitude polyform arrhythmia, monoform delta-rhythm, synchronized teta- and alpha-rhythms. It is assumed that changes of these stages reflect the migration of EEG pacemakers within the system of hierarchically interrelated brain structures, which provide for various forms of regulation of the electrical activity of the cortex. It was shown that in each of the hemispheres, pacemakers operate relatively independently and that electrical stimulation of the dominant (left) hemisphere affects brain activity to a greater extent than stimulation of nondominant (right) hemisphere. The ascending influences of desynchronizing systems of the brain stem are less lateral as compared to the ascending pathways of hypothalamic and thalamic structures.