No one knows what actually causes Alzheimer’s, but the suspects are its two hallmarks — the gunky amyloid in those brain plaques or tangles of a protein named tau that clog dying brain cells. New imaging can spot those tangles in living brains, providing a chance to finally better understand what triggers dementia. Now researchers are adding tau brain scans to an ambitious study that’s testing if an experimental drug might help healthy but at-risk people stave off Alzheimer’s. Reisa Sperling, professor of neurology at Brigham and Women’s Hospital, is the lead researcher.
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