[Factor analysis of spectral EEG-data. Models of application in pharmaco-elektroencephalography (author's transl)].

The factor analysis of spectral EEG values is a data-reducing and also a structural analytical procedure. This procedure enables the numerous frequency variables obtained by spectral analysis to be replaced by a more clearly arranged system of independent complex spectral variables (spectral or frequency factors), while at the same time the interrelations which exist between the individual frequency variables are taken into consideration. The use of this information elucidates the substantial dimensions of spectral configurations, the relationship of the frequency components which constitute them and their factor scores under various conditions. We have used several application models obtained in the course of pharmacoencephalographical examinations which are based on the procedure of a not fully developed multi-model factor analysis; on the basis of these models we have shown how, in a problem-orientated application of the factor analysis, well interpretable information can be gained on the relevant dimensions of the pattern of the brain electric activity, their dynamics and their topical localisation.