In this specific study, the researchers split up a group of 128 young adults into two sets. One group received 10 weeks of training with Lumosity. The other, the control group, played video games for 10 weeks. Before and after the 10-week period, the researchers gave them a series of cognitive tests to see how well each group would do. Both of them did indeed improve by the end of the study, but their improvements were, on average, exactly the same. Neither improved more than the other. In fact, the researchers also gave a third group—who didn’t receive any training at all—the same cognitive tests, and those participants improved about as much as the game players. The more you play Mario Kart, the better you are going to be at it. But the fact that you can kick Mario's butt doesn’t mean you are going to do better in school or kick your smoking habit.