The concept of pruning has to do with the weeding away of connections made as children that are no longer very important. In continuation, the brain goes through dramatic changes during this time that affects how the teenager behaves, feels, and their productivity levels. For example, the "branches" so to speak, that teens develop as children affect how a teenager might understand a situation differently compared to an adult. An example of this would be the teens interpreting the faces they were shown differently than that of the adults. Comparatively this gives us insight that the perception is different at these given ages with different developmental stages of their brains. It is explained in the documentary "Inside the Teenage Brain"
