This article has an interesting discussion of the relation of childhood television watching to the increase in ADHD cases:
�The study revealed that each hour of television watched per day at ages 1 through 3 increases the risk of attention problems by almost 10 percent at age 7,�…Plenty of debate in the article.
Of course, putting large numbers of children in prison like settings 7-8 hours per day is bound to cause some of them to get a bit antsy.