It seems the way of our brain works have some similarities with machines(well, it perhaps among the best average person at this time is able to perceive.). The

It seems the way of our brain works have some similarities with machines(well, it perhaps among the best average person at this time is able to perceive.). The brain gets information from sensors, tries to categorize everything and makes sense by use the categories in mind. New information from the sensors may trigger the brain to recategorize. All those steps make sense. I believe that's one of important reasons screen based devices are not good for little kids. They need to get exposed to the physical world since they are still learning how to interact with the physical world they live in. Leaving kids to screen is a low cost and time/energy-saving solution, but it increases the risk of "less-developed-focusing-muscle".