Biomedical subjects
Publications and source records attributed to V I Davydov.
By means of thermography, local circulation in 501 patient with lesion of the arteries of the extremities was studied. A high informative value of thermography in determination of the degree of impairement in regional circulation was noted.
It has been demonstrated by means of the method of spectral coherence analysis in rabbits, under conditions of a chronic experiment, that when a motor "dominant" reaction is still absent in the early stages of the dominant, interhemispheric asymmetry appears in the Coh spectra of the electrical activity of the sensorimotor cortex and the VPL nucleus of the thalamus. On the other hand, interhemispheric asymmetry appears in the Coh spectra of the electrical activity of the sensorimotor cortex and the CA3 field of the dorsal hippocampus only at the stage at which the motor "dominant" reaction is recorded. The asymmetry in the alpha and beta ranges of the frequencies in the Coh spectra of the biopotentials of the investigated regions, which coincides with the attainment of the motor "dominant" reaction, is associated with the processes of the organization of movement.
By means of daily alimentary deprivation the dominant of hunger was created in rabbits. In response to acoustic stimuli summational swallowing and chewing movements appeared. Spectral analysis of the electrical brain activity showed the presence of primary dominant focus zone (lateral and ventromedial hypothalamus), characterized by an increase of spectrum power in delta-range while in the orbito-frontal, sensorimotor, parietal cerebral cortex, in the medial and lateral preoptic hypothalamic zones the power of biopotentials spectrum decreased within the whole analyzed frequency range.
Study of the motor dominant in man has shown that in aftereffect of rhythmic electrocutaneous stimulation of hand, a latent focus of excitation is formed in the CNS. When using sensory stimuli (light, sound) and also stimuli, addressed to the second signal system, a hand motor reaction appears in the rhythm of earlier electrocutaneous stimulation, what testifies to preservation of rhythmic nature of excitation in the dominant focus. Summation process in the dominant focus is not reflected in human consciousness. Study of the brain biopotentials has shown that at formation of human motor dominant, typical changes of spectral-coherent characteristics of the neocortex electrical activity appear: within the "dominant" hemisphere, the spectrum power, increases in the range of low frequencies; highly coherent connections of electrical processes appear in the delta-range of the frontal-parietal area at conjugate decrease of combination of processes in the parietal-occipital area of the cerebral cortex. Formation of the dominant focus in one hemisphere causes general reconstruction of the structure of intercentral relations of both hemispheres electrical activity.
By the method of spectral-coherent analysis the dynamics was studied of successive changes in the structure the rabbit brain electrical activity coherent relations in the process of formation of motor polarization dominant created by DC anode action on the sensorimotor cortical region. It has been shown that at earlier stages, when the motor "dominant" reaction is absent, there appears an interhemispheric asymmetry in Coh spectra of electrical activity of the sensorimotor cortex and of the thalamus VPL. On the contrary, interhemispheric asymmetry in Coh spectra of electrical activity of the sensorimotor cortex and dorsal hippocampus CA3 field appears only at the stage when the motor "dominant" reaction is recorded. Asymmetry in alpha- and beta-frequencies ranges in biopotentials Coh spectra of the studied regions coinciding with the motor "dominant" reaction realization is connected with processes of movement organization.
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