The author aimed at comparative study of pathology-detecting powers of electroencephalography (EEG) and brain scan of computed axial transverse tomography (CAT) by examining 184 patients who have undergone both of the tests simultaneously. The subjects were divided into 4 groups: Both tests positive, CT positive and EEG negative, CT negative and EEG positive, and both tests negative groups. Fifty seven (31%) belonged to the both tests positive group. Among them a high proportion of 7A% showed the same localization of the abnormal findings. And these subjects showing abnormalities with concordant localization in both tests were found to have relatively fresh lesions. Those belonging to the second group w ith positive CT and negative EEG findings were 10. Among them only 8 were considered to have brain pathologies and 6 of them were found to have old brain lesions of 6 months or longer duration. Normal EEGs in these chronic patients were considered to have resulted from a functional compensation. The third group with negative CT and positive EEG findings numbered 62, about one third of total subjects. Out of the EEGs of the 62, EEGs of 45 subjects were compatible with those of convulsive disorders. The fourth group showing negative findings in both tests were 55. Among these, however, there were 20 subjects manifesting overt clinical symptoms and signs of organic character. Although not all 20 of them could be diagnosed definitely as organic mental disorders, at least several of them be given diagnoses quite convincingly. Thus, it was found that although CT has it ’s function of showing exact anatomical pathology, EEG also has it ’s capacity of revealing a functional disturbance in a wide range of patients suspected to have brain pathologies. Also localization capacity of EEG was remarkably high especially when the pathologies were recent ones of less than 6 months duration.
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