But the latest PISA survey isn’t the only evidence that phones in schools are weapons of mass distraction. Studies have shown that students on their phone take fewer notes and retain less information from class, that “task-switching” between social media and homework is correlated with lower GPAs, that students who text a lot in class do worse on tests, and that students whose cellphones are taken away in experimental settings do better on tests. As Haidt, a psychologist, has written in The Atlantic, the mere presence of a smartphone in our field of vision is a drain on our focus. Even a locked phone in our pocket or on the table in front of us screams silently for the shattered fragments of our divided attention.
—from Are Phones Making the World’s Students Dumber? - The Atlantic [archive]