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Abstract: Investigations of the spontaneous and "evoked" potentials was carried out on 910 normal children and youths aged 8 to 20 years with an Ediswan 16-channel electroencephalograph. We have stimulated the majority of our subjects with "threshold" single and repetitive flashes of light:1. From 8—20 years the occipital rhythmic activity increases in frequency but decreases in amplitude with age. The range of changes in frequency always not exceeds 1±0.5/sec.2. From 8—20 years absence of θ waves has strict regularity. It disappears first from the occipital region, then from the temporal region and finally from the parietal region.3. There are positive correlation between the phenomenon of "dicrotic" and "multicrotic" and the development and maturation of the cerebral cortex of children and youths. Display of the phenomenon of "dicrotic" and "multicrotic" decreases with age.4. From 8—20 years the percentage of display of the "blocking" responses elicited by "threshold" single flashes increases with age. Beyond the age of 13, duration of the "blocking" responses usually exceeds 2 sec. and "full blocking" is always prominent.5. "Driving" responses elicited by "threshold" repetitive flashes show that neurons of the cerebral cortex of children and youths aged 8—16 years have the high plasticity.6. Our results show that it seems to have a period of acceleration of brain's development at about 13—14 years of age.

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