I would like to know what kind of teenagers they used to reach the conclusions.

Are they talking about the brains of a typical modern kid, one who's watched TV, computers, movies, phones and games for hundreds of hours? Such a kid misses many experiences which I would consider normal in developing the brain.

How does the brain of a kid in our society compare with the brain of a kid in the Amazon jungle? On an Amish farm? From a modern home with very little video?

[I ask the question, but I'm not going to hang around for the answer. The only kids I know are teenagers who were raised with very little video, and they are dears and I love them.)