[The dynamic nature and age-related dependence of functional brain organization in attention]

Intrahemispheric functional organization was studied during a task expectancy period with special reference to attention mechanisms. The estimation of coherence of functionally identical rhythmic EEG components was made to characterize the intracortical integration. Several factors influencing the possibility to make an adequate prognosis and to realize it were varied. Different types of the task were used. Subjects of different age (7, 9-10 years, young adults) and children of the same age differing by the brain maturity level were under study. It was shown that all factors studied have certain influence on the brain organization underlying the task preceding attention. Clear age differences as well as the lag between the possibility to formation and realization the prognosis in children were observed. Alternative "strategies" used in different ages to facilitate the task performance were analysed; underlying mechanisms were discussed.