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10 outpatients with bruxism were investigated by polygraphic recordings during night sleep. Electromyogram, electrooculogram and electroencephalogram derivations were used to evaluate the activities of masseter muscle and the different stages of sleep. The results of the bruxist group were compared to those of an age-matched control group. The amount and the length of pressing and grinding jaw movements were correlated with the sleep period time as well as with the different sleep stages. In comparison to the control group, a significant difference of muscle activity longer than 5 s was found, but there was no difference regarding activities of 3–5 s duration. The highest level of activity was found in sleep stage two and during awakening times. No difference was seen with regard to percentages of the sleep stages.

EEG Brain Mapping offers a promising approach to study complex pattern of brain function. However, traditional usage of this method was focussed mainly on isolated details of the whole specter. The present study was, therefore, aimed at the simultaneous observation of all available parameters. Discriminant analysis was used to distinguish between 4 groups of patients suffering from either schizophrenia (acute/off drugs; improved/on drugs) or depression (acute/off drugs; improved/on drugs) and healthy volunteers, each group with n = 10. The multivariate pattern of 50 topographical spectral variables brought about correct group classification of 49 out of 50 probands. Results suggest that more complex statistical paradigms that take advantage of all available parameters add to an integrative explanation of psychophysiological mechanisms in mental illness.

Significant effects were seen for BEDINGUNG (