- Dementia correlates to decreased cognitive function, and Behavioral and Psychological Symptoms of Dementia (Neuropsychiatric symptom, BPSD) as well. Neuropsychiatric symptom composed of abnormal behavior and psychological symptoms: abnormal behaviors include combativeness, wandering, agitation, akathisia, inappropriate sexual behavior, following caregiver, shouting, cursing, insomnia and binge eating while psychological symptoms include anxiety, depression, hallucination, and illusion. Neuropsychiatric symptom is evaluated depending on information given by caregivers, and symptoms are likely to be temporary or changing constantly. Two thirds of patients is found to have neuropsychiatric symptom when they are diagnosed as dementia, 65 % in nursing home and 70~90% in advanced dementia states. Neuropsychiatric symptom attributes important role for mortality, mortality, and cause to enter nursing home.