Evaluations of dementia by EEG frequency analysis and psychological examination.
In order to evaluate the stage of dementia, we focused attention on EEG rhythms and Hasegawa-dementia-rating scale (HDS-R). Frontal EEGs were recorded from dementia patients and normal controls during music and photo-image stimulations, and frequency analysis was performed. In the controls, profiles of rhythm pattern during music stimulation seemed to be markedly different from those during photo-image stimulation. In contrast, in dementia patients, it was difficult to find those differences. Interestingly, as HDS-R decreases, the variability of rhythm patterns also decreases. These results suggest that a decrease in cognitive function might be related to a decrease in the ability to generate various cortical rhythm patterns.
Yoshimura
Hiroshi
H
Department of Oral and Maxillofacial Surgery, Kanazawa Medical University, Uchinada-cho, Ishikawa, 920-0293, Japan. hyoshimu@kanazawa-med.ac.jp
Morimoto
Shigeto
S
Okuro
Masashi
M
Segami
Natsuki
N
Kato
Nobuo
N
D000368:Aged; D058256:Brain Waves; D002540:Cerebral Cortex / Q000503:physiopathology*; D003704:Dementia / Q000175:diagnosis* / Q000503:physiopathology*; D004569:Electroencephalography / Q000379:methods*; D006801:Humans; D009146:Music; D009483:Neuropsychological Tests; D010775:Photic Stimulation; D012720:Severity of Illness Index