[The structure of the cortical-subcortical relationships of the cerebral electrical processes during a motor polarization dominant]

Abstract

Under conditions of rabbit chronic experiments, it was shown by means of the spectral-coherence analysis that the motor polarization dominant formed by the application of DC anode to the sensorimotor cortex produced a novel structure of the intercentral relations between electrical processes not only in the ipsi-, but in the contralateral brain hemisphere. A certain "isolation" of the primary focus was observed in the cortex of the "dominant" hemisphere, which was manifested in a decrease in its delta-range coherent relations with the other cortical areas. At the dominant optimum (in interstimulus intervals), an interhemispheric asymmetry in the EEG coherence spectra was observed in the delta band between the sensorimotor cortical areas, ventroposterolateral thalamic nuclei, and CA3 fields of the dorsal hippocampi. The asymmetry increased during the testing auditory stimulation. Development of the alpha- and beta-band interhemispheric asymmetry in the structures in question coincided with realization of the motor "dominant" reaction and was suggested to be associated with movement organization.