Alzheimer's disease and Dementia with Lewy bodies: How different are they?

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Dementia is a devastating disorder, taking the individuals mind. As the population ages, a significant proportion become demented, impacting on these individuals, their families and the community as a whole (Federal and State budgets for this disorder are costed in the billions). There are many cellular causes of dementia, the most frequent being considered Alzheimer's disease. However, many people currently thought to have Alzheimer's disease have another dementia cause - dementia with Lewy bodies. This study aims to determine 1) how common these two types of dementias are (currently unknown) 2) how better to diagnose them and tell them apart 3) how badly the brain is affected by each disorder and 4) whether the same genes are involved in both disorders. The knowledge we will gain will allow better diagnosis of the cellular causes of dementia, knowledge necessary for rational treatment.