Nihon Ika Daigaku zasshi
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Nihon Ika Daigaku zasshi · Apr 1995
[EEG power and coherence in presenile and senile depression. Characteristic findings related to differences between anxiety type and retardation type].
Quantitative EEG analysis was done on 29 medicated right-handed depressive patients at age over 45 and age and sex matched right-handed 20 normal controls. The patients were all diagnosed as major depression with melancholia by DSM-III-R and were divided into anxiety type (n = 17) and retardation type (n = 12) evaluated with the Hamilton rating scale for depression. Eye closed resting EEGs were recorded on a data recorder from the 16 electrode leads (10-20 system). ⋯ In particular, the anxiety type showed significantly lower alpha 2 band and lower beta 1 and beta 2 bands. The parietal interhemispheric coherence was lower in the anxiety type but higher in the retardation type than in normal controls in each band, and this difference was prominent in theta 2 band. 4) The two groups of patients showed higher fronto-parietal intrahemispheric coherences in both hemispheres than the normal controls in each band. Especially, the anxiety type showed higher in theta two and alpha 1 bands.(ABSTRACT TRUNCATED AT 400 WORDS)