Non-randomized natural history study involving 12 subjects with Down Syndrome, who are aged 30-60 years old. This study will observe 3 different groups: four non-demented subjects between ages 30-40 years old, four non-demented subjects between ages 40-50 years old, and four demented subjects 50-60 years old. Currently available longitudinal data in DS suggest a high rate of transition to dementia from the late 40s through the early 50s of these individuals. This, together with the universal presence of plaques in DS by their mid 40s makes this age range ideal for studying the development of AD.
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Rate of decline as measured by cognitive, functional and behavioral tests
Timeframe: 3 years