Another has a person follow a square moving around a tablet screen with a finger, which measures something called “critical tracking.” One app measures time distortion, because things can slow way down when a person is high. https://pbs.twimg.com/profile_images/788508191919177728/RH00wHyE.jpg
The enherent twitter link has a new image of a tester. I'm not sold on the validity of this new Enherent twitter account but why go to all that trouble for a few dollars in volume? And I really do not believe this new pamelafredette twitter account - CEO fredette has been silent for 5 years and never said much even before that and now she becomes chattycathy???