We investigated the characteristics of beta activities during drowsiness and very light sleep in 61 children using topographical analysis. The average power of beta activities was posterior-dominant in infancy, and it became frontal-dominant as the age increased. These topographical changes occurred earlier in the low frequency bands than the high frequency bands. The total power of the high frequency bands was larger in infants, and with increasing age that of the low frequency bands predominated. The developmental changes of the beta activities considered to be induced by drugs were similar to those of children without drugs.
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PetersenI. and Eeg-OlofssonO., The development of the electroencephalogram in normal children from the age of 1 through 15 years, Neuropädiatrie, 2:247–304, 1971.
