> Back in the 60s or 70s ( I can’t remember what he said) people were starting to notice that kids were having behavioral problems, trouble focusing etc.

Unscientific personal observation, but I wonder if TV has a role in this. Didn't kids start watching a lot of TV around that time?

Also, I feel kids in poor countries with no TV (not that there's much of that left now) have little to no ADHD.