AdvertisementA brain circuit tied to emotion may lead to better treatments for Parkinson's diseaseFebruary 07, 2022Jon HamiltonfacebookEmailPaul has lived with Parkinson's disease for more than a decade. Although he has difficulty rising out of a chair, he was able to leap up to keep his young grandson from falling down a flight of stairs. Scientists are trying to understand how this phenomenon works in the brain. (Meredith Rizzo/NPR)