The CA vs NY conversation included observations about the sudden evolution of our brains from being socially attuned and interactive to being insulated from real face to face interaction with others by the intervention of meaningless words (like) and images (emoticons).
I notice it in the bland, expressionless faces of young parents with their infant children.
By the time an infant is 6 months old it is already too late to teach focused attention; babies learn sensory multi-tasking all too readily. The concentrated attention that emanates from the mother's face is essential to all future learning.
Let's put all the screens in the closet for twenty years and see what happens.--all of them.