Comment how about games? (Score 1) 75
I submit as an alternative hypothesis the rise of computers and interactive entertainment as a cause.
The rise of computers since 1970 coincides with the timing.
The interactive nature of computers in general engage the brain more than just watching tv (3 channels old timey tv), listening to radio, or even reading the newspaper. Games in particular engage the brain much more than being a couch potato. Social media allows faster, easier, and more frequent interactions. The quality of these brain engagements can be argued but I think the net effect for the average person is significantly higher. Just think about how many hours are spent reading news, playing games or even watching cat videos vs staring out the window on a train... staring at the display on the elevator... or looking at your watch on the train platform.