[Correlative formation of functions as one of mechanisms of functional evolution (by an example of maturation of stereognosis and speech function in child ontogenesis)].

A possibility of correlative formation in ontogenesis of central mechanisms of stereognosis and speech function is considered in the paper by example of comparison of changes in spatial organization of interregional interaction of various cortex areas in children of three ages (5-6, 7-8 and 9-10 years) and in adult examinees during their performances of stereognostical, verbal-mnestical and motor manual activity (tepping-test). With age dynamics of children there is observed a significant increase of the degree of similarity of the spatial structure of EEG interrelations characteristic of periods of performance of stereognostical test with patterns of changes of the EEG distant connections revealed at performance of speech tasks. In turn, the similarity of patterns of interregional EEG relations characteristic of stereognostical tasks with the patterns revealed at the periods of performance of the tepping-test is not increased with age. On the whole, the obtained data allow believing that with increase of children's age there rises the degree of topological similarity of the spatial structure of systemic interactions of the cortex zones, on which there are "supported" processes of realization of stereognostical and speech functions. Progressing increase with children's age of the degree of similarity of distributive organization of neurophysiological mechanisms of central provision of the speech and stereognosis functions can indicate in favor of concept of correlative formation of these higher psychical functions in postnatal ontogenesis. The obtained results show that the correlative interfunctional interactions promoting progressive development of cognitive functions in the child ontogenesis can be realized through long fiber associated and commissural pathways composing the morphofunctional longitudinal-transversal "skeleton" ofneocortex in the close interaction with thalamo-cortical integrative systems.