On September 20, 2021, Biogen began a research project to explore adding an integrated mental health tracking application (app) to Apple's iPhone. The goal is to develop algorithms able to timely assess mental health status using sensor-gathered activity, sleep, and phone use data. The researchers anticipate that the app would analyze daily activity data already gathered by the device to automatically detect mental health issues like depression, anxiety, and cognitive decline. The current Biogen study will monitor data gathered by the iPhones and Apple Watches of about 20,000 participants. The data will be used to identify any . . .