[ddebernardy]

Not the OP, but FYI there's a body of research in the wild that suggests ties between the late 20th century fall in IQ with the rise of TV in households.

The gist of the explanation is a combination of decreased parental interaction, owing to kids learning less words when their parents aren't talking to them and hardly learning any words at all when watching TV, and the constant interruptions owing to the TV's sound and animations, which distracts toddlers as they're playing (including when they're not actively watching, like when the TV is on while a parent is ironing or cooking), leading to a decreased ability to concentrate that might ultimately be tied to an uptick in attention deficit disorder.

I'm admittedly no specialist in the matter so I can't speak for how accurate and reliable the research is, but I thought the explanation convincing enough to rule out any TV being turned on in the household while our toddler is around.