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Alzheimer's risk

Interesting news about what people like Britney Spears and Johnny Carson may reveal about Alzheimer's disease.

Researchers at the Cleveland Clinic showed photos of celebrities to a group of men and women over the age of 65.

Those who had a family history of Alzheimer's, along with other genetic markers, showed high levels of activity in the memory-related parts of the brain.

But the group with the lowest risk of Alzheimer's showed the opposite pattern.  Their brains were more active when shown photos of --unfamiliar-- people.

Researchers say this could mean the at-risk people had to work harder to recognize celebrities, compensating for damage that's already occurred in the brain.

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