LONGITUDINAL EEG FINDINGS IN DEMENTIA RELATED TO THE PARIETAL BRAIN-SYNDROME AND THE DEGREE OF DEMENTIA

EEG slow-wave activity was correlated with the regional brain syndrome profile in 74 patients with dementia. The EEGs were visually assessed using a semiquantitative rating scale. The intensities of four region al brain syndromes (parietal, frontal, subcortical, global) and the de gree of dementia were rated, The patients were examined twice with a 1 -year interval. A significant relationship was found between the incre ase in EEG slow-wave activity and the increase in intensity of the par ietal brain syndrome. A somewhat lower significance was found for the relation between increase in slow-wave activity and increase: in demen tia degree. The results suggest that the EEG deterioration in dementia mainly reflects the gradual decline of parietal brain function.