| Abstract: | Available evidence reveals that, although the incidence of abnormal electroencephalograms (EEGs) varies between 10% and 15% in the general adult population, abnormal EEGs occur in 48–70% of aggressive psychopaths. The fact that the EEGs of aggressive, adult psychopaths show a high degree of similarity to the EEGs of normal young children has suggested that aggression may somehow result from a failure in the normal development of the central nervous system. This “maturational-retardation” hypothesis of aggression was investigated in the present study, the purpose of which was to discover whether behavior-problem children who are severely aggressive have immature EEGs, or EEGs characteristic of chronologically younger children. Six severely aggressive boys, aged 8.7–13.6 years, had their EEGs recorded while performing a simple reaction task. For each subject, an interval histogram consisting of measurements of the duration of 780 half wavelengths in the EEG was generated by the computer using the tracing from the left parietal-occipital (P3 -02 ) derivation. The resulting histograms were subjected to a central moments analysis and age of each subject was estimated from the moments by means of a multiple regression equation. This equation, which relates an individual's age to the 2nd, 3rd, and 4th central moments of his EEG interval histogram, had been derived by Surwillo [1975a] on a group of normal boys. In every case, age predicted from the EEG of a severely aggressive subject was less than the subjecťs actual age. This finding was statistically significant, as the probability of the outcome occurring by chance was only 0.016. The results of the experiment supported the maturational-retardation hypothesis of aggressive behavior. |
