Nearly 60 adults ages 40 to 65 (half of whom had a form of early-onset dementia) were asked to identify pictures of 20 famous people, including John F. Kennedy, Bill Gates and Elvis Presley.

Result: Only 46% of those with dementia could name all the faces (although nearly 80% recognized them). In participants with normal brain function, more than 90% could name the faces.

Explanation: Naming and recognition abilities decline with loss of brain tissue.

If you're having trouble identifying people you once knew: See a neurologist for an evaluation

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