Right. The brain is like a muscle, and if it's not being engaged or challenged, then what would you expect? You could replace these studies with: "Not using th

Right. The brain is like a muscle, and if it's not being engaged or challenged, then what would you expect? You could replace these studies with: "Not using the brain is bad for the brain." The screen itself is basically a red herring. What's on the screen matters. There's a big difference between interacting with a puzzle or strategy game and passively consuming a video, for example.