2nd Generation Just-in-Time Adaptive Interventions
2nd Generation Just-in-Time Adaptive Interventions (JITAIs) use reinforcement learning to continually update and sustain intervention effectiveness over time. 2nd Generation JITAIs respond to societal changes and evolving population-based needs, as well as to each individual’s evolving needs.
As with JITAIs, 2G-JITAIs often are used in the context of mobile health or digital health interventions. Typically, in these settings, the unit of intervention is the individual, intervention is offered/provided by (or in conjunction with) a digital device (e.g., smartphone, smartwatch), and the intervention decision points can be very frequent (e.g., every minute, or multiple times per day).
A key distinction between a JITAI and a 2G-JITAI is that: In a JITAI, the decision rules are pre-specified. Whereas in a 2G-JITAI, a pre-specified reinforcement learning algorithm is used to continuously update the decision rules.