Heightened activity in an area of the brain that deals with memory may give a subtle early warning of dementia decades later, UK research suggests.
It was known carrying that a rogue version of a gene called ApoE4 raised the risk of Alzheimer's disease.
Now researchers have linked the same mutation with raised activity in an area of the brain called the hippocampus in people as young as 20.
The study appears in Proceedings of the National Academy of Science.
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