A computer-based, quantitative technique for assessing degree of regulation of EEG rhythms

A quantitative method of assessing the degree of regulation of EEG rhythms is described. The method requires the measurement of the durations of a large number of waves in a person's EEG; these measures are then cast into a frequency distribution. Analysis involves the computation of the first four central moments of the frequency distributions. The procedure normally is carried out on a computer, but alternatively it can be done manually as well. Data reported on 126 children, aged 4-17 years, suggested that the method provides a quick and easy way of measuring regulation of the EEG rhythms. Substantial, statistically significant correlations between age and the 2nd, 3rd and 4th central moments revealed that regulation is relatively poor in young children but improves progressively over the age span investigated. In a group of 12 adults that were also studied, the magnitudes of the 2nd, 3rd and 4th central moments were significantly associated with a clinical electroencephalographer's judgment of the degree of dysrhythmia shown in their EEG tracings. Findings suggest that the method may provide an objective, quantitative means of assessing EEG dysrhythmia.