[Contemporary legislation and importance of psychophysiologic examination in system of medical support for workers engaged into production with radiation and nuclear danger].

In accordance with contemporary legislation, the article covers materials on specification and approbation of concept model for psychophysiologic examination in medical establishments during medical examination of workers engaged into production with raidation and nuclear danger. The authors defined methodology, examination methods and designed an order of psychophysiologic examination. The psychophysiologic examination and purpose-oriented rehabilitation appeared efficient.

[Asymmetry of power in the EEG rhythms as a parameter of the brain function]. / Velichina asimmetrii moshchnostei ritmov EEG kak pokazatel' funktsional'nogo sostoianiia mozga.

Comparison of power asymmetry (PA) has shown that low PA values occurred in the posterior cortical parts in adult examinees free of focal brain pathology, in anterior and posterior cortical parts in children and in patients with affected left hemisphere. In view of immaturity of the brain and unbalanced subcortical-cortical relationships in children there was enhanced functional activity of diencephalo-truncal structures. It is suggested that in patients with damaged left hemisphere functional activity of the right hemisphere dominates, therefore dominates functional activity of synchronizing diencephalo-truncal structures. High interhemispheric asymmetry was detected in anterior parts of the cortex in patients free of focal brain pathology as well as in anterior and posterior parts of the neocortex in patients with damaged right hemisphere. This can be explained by prevalence of activating stem structures in brain functioning. Damage to the right hemisphere affects more synchronizing truncal structures and intact left hemisphere becomes leading in CNS activity. This hemisphere has primarily functional relations with activating stem structures. Thus, the value of interhemispheric asymmetry of EEG biopotentials' powers may characterize brain function forming in participation of nonspecific stem system regulating functional condition of the brain.

[Electrophysiological aspects of the indicators of hemispheric asymmetry during reparative processes in the brain after unilateral lesions]. / Elektrofiziologicheskaia kharakteristika pokazatelei mezhpolucharnoi asimmetrii pri vosstanovitel'nykh protsessakh v mozge posle ego odnostoronnego povrezhdeniia.

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.

[Interhemispheric asymmetry in the anterior and posterior sections of in the normal human brain and in unilateral cortical damage]. / Sostoianie mezhpolusharnoi asimmetrii v perednikh i zadnikh otdelakh mozga cheloveka v norme i pri odnostoronnem povrezhdenii kory.

The study of interhemispheric bioelectrical asymmetry (IBA) of the brain as a result of pair activity of the hemispheres has shown that in normal subjects IBA was greater in the frontal lobes than in the occipital ones. In patients with injured right hemisphere the asymmetry increased in the occipital lobes. In patients with injured left hemisphere the asymmetry diminished in the frontal lobes.

[Interhemisphere bioelectric asymmetry in the process of recovery in dysfunctions of the brain after unilateral lesion]. / Mezhpolusharnaia bioélectricheskaia asimmetriia v protsesse vosstanovleniia narushennykh funktsii mozga posle ego odnostoronnego povrezhdeniia.

The interhemispheric organization of brain electrical processes was shown to depend on the lateralization of an injury. The EEG asymmetry was significant with a tumor being in the right hemisphere as compared with that of healthy subjects. When a tumor was in the left hemisphere, the asymmetry was more considerable than that in healthy persons. An analysis of electrophysiological findings and clinical symptomatology makes the author to regard interhemispheric asymmetry as a significant index of the functional interactions of the hemispheres and the nature of a postoperative process.

[Interhemispheric asymmetry in patients in the rehabilitation period after unilateral damage to the cerebral cortex]. / Sostoianie mezhpolusharnoi asimmetrii u bol'nykh v vosstanovitel'nom periode posle odnostoronnego povrezhdeniia kory golovnogo mozga.

The studies revealed that the level of interhemispheric bioelectric asymmetry, which reflects the functional relations between the hemispheres, is one of the major indices of the functional interaction of the two hemispheres. There were changes in interhemispheric asymmetry in relation to the tumor damage to the right or left hemisphere. The structural lesion of the left hemisphere did not appear to affect interhemispheric asymmetry, whereas right hemispheric dysfunction led to its significantly marked asymmetry, i. e. the mechanisms ensuring the stability and symmetry of electric activity of the two hemispheres are mainly associated with the structures of the right hemisphere.

[The electrophysiological characteristics of the compensatory and restorative processes in the central nervous system of neurosurgical patients in relation to the lateralization of the injury]. / Elektrofiziologicheskie kharakteristiki kompensatornykh i vosstanovitel'nykh protsessov v tsentral'noi nervnoi sisteme u neirokhirurgicheskikh bol'nykh s uchetom lateralizatsii porazheniia.

The authors studied the functional condition of the brain during the restorative period after operative damage to one of the hemispheres. In the early stages of the restorative period in neurosurgical patients with a slow rhythm afferent stimuli (rhythmic light stimulation) induced the appearance of a marked alpha-rhythm, which is evidence of restoration of the functional condition of the cortical and subcortical structures taking part in the generation of this rhythm. Such dynamic changes in the condition of the structures may be considered as a manifestation of their activation and evaluated as a favourable prognostic sign. Data were obtained which characterized the features of the restorative-compensatory process depending on which hemisphere, right or left, the damage was inflicted. According to the indices of the various rates of EEG, high-frequency waves of beta-range prevailed in the intact left hemisphere on the 12th-25th day; this phenomenon was not recorded in an intact right hemisphere in damage to the left hemisphere.