Companion: Sensor-based Two-way Communication for Physical Activity in Older Adults

"Companion integrates wearable sensing with the smartphone to develop a behavior-aware, virtual system that uses a human-in-the-loop approach to enable meaningful two-way communication. Companion builds rich models of typical behavior using sensors and context sensitive ecological momentary assessment to deliver intervention components and behavior change strategies using socially engaging, contextually salient, and tailored text-message conversations in near-real-time."