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Period analysis of the electroencephalogram: normative data.

This paper presents results from research which utilized the technique of period analysis to evaluate electroencephalograms (EEGs) from a control population. Twenty-six subjects were selected for testing. EEGs were done in a special electrically shielded testing environment. Two hundred min of continuous KEG data were obtained. Electrodes were placed according to the International Federation 10–20 technique. Processing and analysis of the data were accomplished on a small laboratory computer. Eight “major periods” (4 Hz band width each) of the analog EEG signal were calculated. The normative data corresponding to this analysis is presented. No statistically significant differences were noted between opposing hemispheres. The findings present evidence and encouragement for the utilization of automated EEG analysis in a routine clinical setting.