The researchers summed up: "As the smartphone becomes more noticeable, participants' available cognitive capacity decreases.Your conscious mind isn't thinking about your smartphone, but that process—the process of requiring yourself to not think about something—uses up some of your limited cognitive resources.Take the current remarkable toppling of powerful men for sexual harassment.

(Girls seem to be especially hard hit.) But even more interesting to me was the comment, by the clinical director of an Oregon mental-health institute specializing in anxiety, that smartphones give teens what he called the “illusion of control and certainty,” enabling them to “manage the environments” of daily life.

“Teens will go places if they feel like they know everything that will happen, if they know everyone who will be there, if they can see who’s checked in online,” he said.

Twenge cites surveys that have posed a set of life-quality questions to high school seniors annually for the last forty years.

“The results could not be clearer: Teens who spend more time than average on screen activities are more likely to be unhappy, and those who spend more time than average on nonscreen activities are more likely to be happy.” Twenge acknowledges that “no single factor ever defines a generation.” That said, she goes on: “It’s not an exaggeration to describe i Gen as being on the brink of the worst mental-health crisis in decades.

Fast track 18 months and the Sydney resident has her own luxury sportswear line, is a market editor for Grazia and has graced the pages of numerous magazines - all while sharing her enviable lifestyle online.

The four-year-old riding in the elevator with her mom was coming from a party and covered with glitter.

Apparently she’d been asking her mom about the sparkly stuff, because as I entered, the mom had just googled it on her smartphone and was delivering a tidy mini-lecture on the history, science, and cultural significance of glitter.

I listened, and twenty seconds later, I left the elevator edified, via a small packet of information zapped up on the device Apple inaugurated a decade ago this fall.

I was not surprised to hear teenagers express a worried preoccupation with how they’re being presented and judged by their peers out there in cyberworld.