The brain bioelectric activity changes in patients, suffering comatose state, may not be revealed by electroencephalography (EEG) data. This obstacle makes difficult to accomplish the patient functional state estimation and restricts the conducted treatment efficacy. That's why there was elaborated a quantitative diagnostic criterion of EEG--coefficient of a subcortex activation, permitting precisely and objectively to estimate the changes of functional state of the comatose patient brain.
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