Elliot Chang writes: It’s well-known that video games improve hand-eye coordination, so it shouldn’t come as a huge surprise that stroke patients could recover their range of motion by playing them. Four mechanical-engineering students at McGill University in Canada have developed an inexpensive sensor glove that allows patients to exercise in a game-like fashion at home with minimal supervision. Self-therapy? Well, yes and no. Using the accompanying software, doctors will be able to monitor their charges’ progress off-site, cutting down on hospital visits and costs.