The Secret Cause of Dementia

Guest: Steven Greenberg, MD, PhD, Professor of Neurology, Harvard Medical School Stroke is often thought of as a single event – a big thing that happens to someone’s brain and has lasting effects. But there’s a slower, more progressive form of stroke that entails tiny vessels in the brain leaking blood over time. Researchers now believe this kind of stroke is closely tied to rising rates of dementia in America.