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Parietal cortex inputs from cerebellum
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C-7.03 THE DYNAMICS OF EEG FREDUENCY CHARACTERISTICS IN CHILDREN AGED FROM 7 TO 11 YEARS. V.V. Alferova (Moscow, USSR)
C-7.02 THE FORMATION OF NEUROPHYSIOLOGICAL MECHANISMS OF CORTICAL ACTIVATION. N.V. Dubrovinskaya (Moscow, USSR)
A longitudinal investigation of.EEG frequency characteristics in conditions of rest and sound stimulation was undertaken. 20 schoolchildren aged from 7 to 11 years were under study. The registration of EEG was carried out in September, October, December and April. It was shown that during the age interval studied the formation of a well pronounced mode of alpha rhythm and the broadening of its frequency range took At the age of 10 the 10 c/set frequency place. became subdominant and the representation of ll12 c/set rhythms as well as those of the beta range increased. Repeated explorations have shown in 7-8 year-old children the instability of EEG during a year: from October to April the representation of alpha rhythm decreased, its mode fluctuated in a range of 2 c/set, the number of theta waves increased. At 9 years during a year the stability of EEG frequency characteristics increased, the mode was constant and the theta rhythm was slightly increased. At the age of 10 the pronounced stabilization of EEG characteristics was revealed. The functional significance of EEG frequency changes during a year and possible mechanisms of EEG stabilization with age are discussed.
The electrophysiological investigation of four groups of children (3-4, 6-7, 7-8 and 9-10 years old) has revealed definite age changes in the EEG manifestation of the activation process during attention and its functional significance. In the age interval studied the progressive development of alpha blocking and the parallel diminution of other forms of activation reaction (increase of theta and alpha waves) were noted. These data are considered to show the increasing capability of children for extracting the cognitive (informational) component of stimuli and the relative diminution of the role of the The observed emotional component in attention. changes are determined by: 1) the morpho-functional maturation of the activation system com2) the development of epistemic curiponents, osity and 3) the involvement of frontal lobes controlling the hierarchy of significance categories in the activation system. A study carried out on rabbits of different ages has also stressed the role of maturing neocortical formations and of specialized corticofugal influences in organizing the reactivity of brain structures united in the activation system, which is reflected in the adequacy of neuronal and EEG reaction dynamics to changing grades of stimulus novelty and significance.
A-8.04 ELECTROPHYSIOLOGICAL ANALYSIS OF THE PARTICIPATION OF POSTERIOR ASSOCIATIVE CORTICAL AREAS IN VISUAL PERCEPTION. D.A. Farber (Iloscow, USSR) In 3-12 year-old children and adults the VEPs in projection and nonprojection cortical areas to different visual stimuli (diffuse illumination, checker-board and face patterns, geometrical figures) were analysed. It was shown that the temporary characteristics of the VEP in the temporo-parieto-occipital (TPO) area were similar to those in occipital (0) cortex. In 3-4 yearold children the configuration and reactivity Iof VEP in TPO and 0 were analogous, From the age of 9 the VEP in TPO is characterized by the predominance of the N200 wave. Beginning from 5-6 years the VEP in TPO is most pronounced to visual tasks requiring stimulus identification. In experiments on rabbits the essential influence of posterior associative areas on information processing in projection cortex was revealIts conditional stimulation leads to siaed. nificant enhancement of the inhibitory paused and secondary activation in visual neuronal responses. This corresponds to the increase of VEP components in the time interval from 150 to 250 The influences of posterior associative msec. areas are gradually formed in ontogenesis. The specific role of posterior associative cortex in the analysis of visual stimuli is discussed with special reference to the system organization of visual perception.
A-8.05 AUDITORY EVOKED POTENTIALS TO INDIFFERENT AND SIGNIFICANT STIMULI IN CHILDREN WITH DIFFERENT LEVELS OF MENTAL DEVELOPMENT. A.A. Ibatullina and Y.F. Zmanovsky (Moscow, USSR) In two groups of normal children approaching the 3rd year of age with two levels of mental development (higher level-group 1, lower-group 2) brain evoked potentials were obtained in two when the stimulus was indifferent situations: and during elaboration of the conditioned reflex. AEPs to the indifferent stimulus in children of group 1 were shown to have more comolicated wave forms. lower variabilitv and A conditioned reflex in the shorter latency. children of group 1 was elaborated to the lo12th presentation of the stimulus, while in group 2 it was not elaborated even to the 32nd presentation. The reaction to the significant stimulus in group 1 was characterized by increasing amplitude, complication of the wave forms and lengthening of the latencies of AEP in all inIn group 2 there were small vestigated areas. AEP changes in vertex and parietal areas. AEPs of frontal areas were practically unchanged. The results could be explained from the point of view of different levels of CNS maturation and responsiveness of the child as well as by individual types of neural activation.
C-7.03 THE DYNAMICS OF EEG FREDUENCY CHARACTERISTICS IN CHILDREN AGED FROM 7 TO 11 YEARS. V.V. Alferova (Moscow, USSR)
C-7.02 THE FORMATION OF NEUROPHYSIOLOGICAL MECHANISMS OF CORTICAL ACTIVATION. N.V. Dubrovinskaya (Moscow, USSR)
A longitudinal investigation of.EEG frequency characteristics in conditions of rest and sound stimulation was undertaken. 20 schoolchildren aged from 7 to 11 years were under study. The registration of EEG was carried out in September, October, December and April. It was shown that during the age interval studied the formation of a well pronounced mode of alpha rhythm and the broadening of its frequency range took At the age of 10 the 10 c/set frequency place. became subdominant and the representation of ll12 c/set rhythms as well as those of the beta range increased. Repeated explorations have shown in 7-8 year-old children the instability of EEG during a year: from October to April the representation of alpha rhythm decreased, its mode fluctuated in a range of 2 c/set, the number of theta waves increased. At 9 years during a year the stability of EEG frequency characteristics increased, the mode was constant and the theta rhythm was slightly increased. At the age of 10 the pronounced stabilization of EEG characteristics was revealed. The functional significance of EEG frequency changes during a year and possible mechanisms of EEG stabilization with age are discussed.
The electrophysiological investigation of four groups of children (3-4, 6-7, 7-8 and 9-10 years old) has revealed definite age changes in the EEG manifestation of the activation process during attention and its functional significance. In the age interval studied the progressive development of alpha blocking and the parallel diminution of other forms of activation reaction (increase of theta and alpha waves) were noted. These data are considered to show the increasing capability of children for extracting the cognitive (informational) component of stimuli and the relative diminution of the role of the The observed emotional component in attention. changes are determined by: 1) the morpho-functional maturation of the activation system com2) the development of epistemic curiponents, osity and 3) the involvement of frontal lobes controlling the hierarchy of significance categories in the activation system. A study carried out on rabbits of different ages has also stressed the role of maturing neocortical formations and of specialized corticofugal influences in organizing the reactivity of brain structures united in the activation system, which is reflected in the adequacy of neuronal and EEG reaction dynamics to changing grades of stimulus novelty and significance.
A-8.04 ELECTROPHYSIOLOGICAL ANALYSIS OF THE PARTICIPATION OF POSTERIOR ASSOCIATIVE CORTICAL AREAS IN VISUAL PERCEPTION. D.A. Farber (Iloscow, USSR) In 3-12 year-old children and adults the VEPs in projection and nonprojection cortical areas to different visual stimuli (diffuse illumination, checker-board and face patterns, geometrical figures) were analysed. It was shown that the temporary characteristics of the VEP in the temporo-parieto-occipital (TPO) area were similar to those in occipital (0) cortex. In 3-4 yearold children the configuration and reactivity Iof VEP in TPO and 0 were analogous, From the age of 9 the VEP in TPO is characterized by the predominance of the N200 wave. Beginning from 5-6 years the VEP in TPO is most pronounced to visual tasks requiring stimulus identification. In experiments on rabbits the essential influence of posterior associative areas on information processing in projection cortex was revealIts conditional stimulation leads to siaed. nificant enhancement of the inhibitory paused and secondary activation in visual neuronal responses. This corresponds to the increase of VEP components in the time interval from 150 to 250 The influences of posterior associative msec. areas are gradually formed in ontogenesis. The specific role of posterior associative cortex in the analysis of visual stimuli is discussed with special reference to the system organization of visual perception.
A-8.05 AUDITORY EVOKED POTENTIALS TO INDIFFERENT AND SIGNIFICANT STIMULI IN CHILDREN WITH DIFFERENT LEVELS OF MENTAL DEVELOPMENT. A.A. Ibatullina and Y.F. Zmanovsky (Moscow, USSR) In two groups of normal children approaching the 3rd year of age with two levels of mental development (higher level-group 1, lower-group 2) brain evoked potentials were obtained in two when the stimulus was indifferent situations: and during elaboration of the conditioned reflex. AEPs to the indifferent stimulus in children of group 1 were shown to have more comolicated wave forms. lower variabilitv and A conditioned reflex in the shorter latency. children of group 1 was elaborated to the lo12th presentation of the stimulus, while in group 2 it was not elaborated even to the 32nd presentation. The reaction to the significant stimulus in group 1 was characterized by increasing amplitude, complication of the wave forms and lengthening of the latencies of AEP in all inIn group 2 there were small vestigated areas. AEP changes in vertex and parietal areas. AEPs of frontal areas were practically unchanged. The results could be explained from the point of view of different levels of CNS maturation and responsiveness of the child as well as by individual types of neural activation.