[Sex distribution of EEG phenomena with particular reference to subcortical dysfunctions]

The most constant or continually recurring sexual difference observed from childhood through to old age and determined from the results of a total of 1500 electroencephalograms was a considerable increase in beta activity occurring in female individuals at an earlier time and at a higher rate. The more frequent observation in male individuals of a "pure" alpha electroencephalogram may be interpreted as suggesting a slight decrease of vigilance in them. The percentage of abnormal electroencephalographic results was highest in females, the proportion being 62.5%:51.5% and the functional disorders occurring chiefly in the form of subcortical dysfunctions (30%:20%). Low voltage was found to be predominant in males. More frequent occurrence in the female sex of weakness of the brainstem and a more sensitively reacting formatio reticularis may be considered a possible explanation; also, attempts are made to bring the results obtained into causal or reciprocal relation to psychic conditions. Beta activity is perhaps a parameter of emotionality.