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Electroencephalographic Intercentral Interaction as a Reflection of Normal and Pathological Human Brain Activity

  • Galina N. Boldyreva (a1), Ludmila A. Zhavoronkova (a1), Elena V. Sharova (a1) and Irina S. Dobronravova (a1)

Abstract

The authors summarized EEG findings and defined the nature of the intercentral EEG relationships in different functional states in healthy subjects and patients with organic cerebral pathology, based on a coherence analysis. Similar EEG characteristics in healthy individuals were identified: an anterior-posterior gradient of average coherence levels, the type of cortical-subcortical relationships in anterior cerebral structures. Right- and left-handed individuals showed frequent and regional differences in EEG coherence, which mainly reflected specificity of intracortical relationships. Development and regression of pathology in right-and left-handed individuals with organic brain lesions were thought to be caused by these differences. Lesions of regulatory structures (diencephalic, brain stem and limbic structures) provoked a more diffused kind of changes of intercentral relationships, in contrast to cortical pathology. These changes tended to reciprocate. The dynamic nature of intercentral relationships and their interhemispheric differences was revealed when changing functional states of the brain (increase and decrease of functional level) in healthy individuals and patients with organic cerebral pathology in the process of conscious and psychic activity restoration. Changing activity predominance of certain regulatory structures was considered one of the most important factors determining the dynamic nature of EEG coherence.

Los autores resumen los resultados de las investigaciones de las relaciones intercentrales de EEG de personas sanas en distintos estados funcionales y de enfermos con lesiones orgánicas del SNC, mediante análisis de coherencia. Se revelan características semejantes de la estructura de relaciones de EEG de personas sanas: la gradiente anterior-posterior de niveles medios de coherencia, el carácter de la interacción cortical-subcortical de las secciones anteriores de los hemisferios. A su vez, se detectan diferencias de frecuencia y regionales en la coherencia de EEG en diestros y zurdos, que reflejan mayoritariamente la especificidad de la interacción intracortical. Se cree que estas diferencias causan la especificidad del desarrollo y la regresión de los estados patológicos de diestros y zurdos en lesiones cerebrales orgánicas. Se señala que en las lesiones de formaciones reguladoras (diencefálicas, troncales, límbicas) Provocan unos cambios de las relaciones intercentrales más difusos que en casos de patología cortical. Estos cambios tienden a la reciprocidad. Se revela el carácter dinámico de las relaciones intercentrales y sus diferencias interhemisféricas en los cambios de los estados funcionales del cerebro (incremento, disminución del nivel de funcionamiento) en personas sanas así como en la recuperación de la conciencia y la actividad psíquica en enfermos con patología cerebral orgánica. Uno de los factores que determina el carácter dinámico del cambio de la coherencia del EEG es el cambio del predominio de la actividad de ciertas estructuras reguladoras.

Copyright

Corresponding author

Correspondence concerning this article should be sent to Galina N. Boldyreva, Moscow, 117475, ul. Butlerova. 5a. E-mail: GBoldyreva@nsi.ru

References

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Keywords

Electroencephalographic Intercentral Interaction as a Reflection of Normal and Pathological Human Brain Activity

  • Galina N. Boldyreva (a1), Ludmila A. Zhavoronkova (a1), Elena V. Sharova (a1) and Irina S. Dobronravova (a1)

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