They do, at the very end, touch on the "cause and effect" versus correlation" problem, where it might be that ADD children are more likely to be put in front of

They do, at the very end, touch on the "cause and effect" versus correlation" problem, where it might be that ADD children are more likely to be put in front of the television by parents desperate to keep them occupied. All these studies are fraught with problems that would go away if they allowed us to experiment freely on children. But since that's unacceptable, we gather data as we can, and try to glean from it as much as possible. This article provides another data point.