Abstract
Recently, people of advanced age is increasing rapidly and following this the number of dementia is also increasing. The present study aimed to examine whether working memory task (1 back task) is available for an early diagnosis of dementia and to develop the early diagnostic method of dementia, by noticing that the prefrontal cortex is related to dementia and working memory. There was positive significant correlation between a number of right answer for working memory task and score of Hasegawa Dementia Rating Scale (HDS-R). In EEG coherent results, there was significant correlation between coherence of EEG and the score of HDS-R, especially in beta wave. The present results suggested that diagnosis using working memory task might be effective in detecting the presence of pre-stage of dementia.
