[Electrophysiological aspects of the indicators of hemispheric asymmetry during reparative processes in the brain after unilateral lesions].

The gears of the conjugate activity of hemispheres in the presence of damage in one were studied before and after removal of a tumor by using an interhemispheric asymmetry index. On left hemispheric exposure, the index decreased in the anterior brain regions having mainly morphofunctional connections with the activating structures of the stem. The posterior cortical regions changed the index on exposures of the right hemisphere or synchronizing stem structures. In an operated-on patients, the damaging action at any site reduced the index in the anterior cortical regions. Interhemispheric asymmetry of the posterior regions increased or unchanged with left hemispheric damage and decreased with right hemispheric one. These changes are interpreted as a reflection of compensatory rearrangements of interhemispheric interactions which are accomplished under the influence of the activating and synchronizing systems of the brain stem.