Study of the alpha frequency band of healthy adults in quantitative EEG

The qEEG of the alpha band in 115 healthy adults, and for comparison the SPM of 244 patients, were studied. The alpha band was divided into three subgroups: alpha 1 (8-8.9Hz), alpha 2 (9-10.9Hz) and alpha 3 (11-12.9Hz). This method could both demonstrate the dominant rhythm of healthy adults and discover alpha slowing. The distribution of the level of power and percentage of frequency in alpha 1, 2 and 3 varied on different head regions. While the distribution of alpha 1 was the same as the theta and delta bands, there was a trend toward abnormally high power of alpha 1 and theta bands in patients.