Methods, apparatuses, computer program products, devices and systems are described that carry out accepting user data from an interaction between a user and at least one device-implemented application unrelated to user-health testing; mapping the user data from the interaction between the user and the at least one device-implemented application unrelated to user-health testing to at least one user-health test function set; accepting brain activity measurement data proximate to the interaction between the user and the at least one device-implemented application unrelated to user-health testing; and selecting at least one user-health test function at least partly based on the at least one user-health test function set and the brain activity measurement data.