RESUMEN
In adult healthy right-handed subjects, the expression and degree of synchronization of the EEG alpha-range rhythmic components in different areas of the right and left hemispheres, were studied in a state of quiet wakefulness and during solving of verbal and spatial tasks presented in the visual field. The EEG of quiet wakefulness was characterized by different distribution of the alpha-range rhythmic components in the right and left hemispheres; in the right hemisphere low frequencies (7.5-10.5 c/s) were more expressed and more coherent; in the left one--the high frequencies (10.5-13.5 c/s). The solving of tasks was accompanied--along with a decrease of the whole alpha-range power spectra both in the right and the left hemispheres--by a local increase of synchronization of certain components of this range; the increase was specific to the hemisphere and the kind of task. The increase of synchronization of low-frequency components was observed in the right hemisphere during solving of the spatial task and that of the high-frequency components was noticed in the left hemisphere during solving of the verbal task. On the basis of the data on hemispheric specificity of electric activity synchronization of the alpha-rhythm, a suggestion is made about a different character of the functional integration of the structures of the right and left hemispheres in the process of solving of spatial and verbal tasks.
Asunto(s)
Dominancia Cerebral/fisiología , Electroencefalografía , Percepción de Forma/fisiología , Solución de Problemas/fisiología , Conducta Verbal/fisiología , Adulto , Ritmo alfa , Mapeo Encefálico , Computadores , Sincronización Cortical , HumanosRESUMEN
Static and dynamic characteristics of unit responses to single and multiple clicks and diffuse light flashes were studied in neurones of CA1 field of the dorsal hippocampus in alert, loosely fixed rabbits. The recorded neurones were characterized by specificity of sensory inputs, selectivity and plastic reorganizations of reactions. Validity of Sokolov model of plastic convergence for neurones of CA1 field and functional significance of the output signal of CA1 field in the system of control of activation processes in OR are discussed.