Most teens today own a smartphone and go online every day, and about a quarter of them use the internet "almost constantly," according to a 2015 report by the Pew Research Center. Now a study published this week in JAMA suggests that such frequent use of digital media by adolescents might increase their odds of developing symptoms of attention deficit hyperactivity disorder. From a report: "It's one of the first studies to look at modern digital media and ADHD risk," says psychologist Adam Leventhal, an associate professor of preventive medicine at the University of Southern California and an author of the study. When considered with previous research showing that greater social media use is associated with depression in teens, the new study suggests that "excessive digital media use doesn't seem to be great for [their] mental health," he adds. Previous research has shown that watching television or playing video games on a console put teenagers at a slightly higher risk of developing 查看全文>>