[The specificity of the recovery processes in the brain of patients with diencephalic and hemispheric lesions (an EEG coherence analysis)].

Inter- and intrahemispheric EEG coherence and its asymmetry was studied in 65 patients with head tumors, 70 patients with head injury before and after surgery. Control characteristics were obtained from 20 healthy subjects. EEG and clinical data were compared in patients with right and left hemispheric tumors. Patients with left hemispheric tumors were characterized by a shorter recovery period (EEG and clinical data), earlier stage of diencephalic activation, and by the right hemispheric asymmetry of EEG coherence. These characteristics were not observed in patients with right hemispheric tumors. Interhemispheric coherence decreased to a higher degree in patients with right hemispheric damages in comparison to those with the left ones, especially in the central leads in the theta-range. In patients with the left foci the maximal interhemispheric coherence decrease was observed in the frontal recordings. Coherence characteristics and their dynamics were shown to be alike in patients with right hemispheric and diencephalic damages.