[Spectral analysis of fast EEG rates in normal 6-to-16-year-old children]

Spectral analysis of EEGs from 208 school children aged from 6 to 16 shows two types of beta activity: anterior beta which is low in amplitude but increases in energy in response to eye opening and posterior beta which, like alpha, decreases in response to eye opening. After reviewing the role of the FFT in frequency analysis we conclude that anterior beta activity corresponds to the classic beta rhythm of visual analysis, while posterior beta activity probably represents harmonics of alpha or even theta activity. In any case, beta activity in the normal child is very low in amplitude and energy.