This app is for people enrolled in the Parkinson’s Progression Markers Initiative (PPMI) study from The Michael J. Fox Foundation. Not enrolled? Learn more at www.michaeljfox.org/ppmi.

PPMI follows people — with and without Parkinson's — over time to learn more about how disease starts and changes. That information may lead to insights and tools that can help better diagnose, treat and even prevent brain disease.

PPMI has partnered with health care company Roche to gather more data through this app. By interacting with the app and carrying your smartphone with you, you can share information on how you move and feel. That data can help understand changes related to brain health.