Concussion is a type of brain injury that happens after a bump to the head Sign up for our free Health Check email to receive exclusive analysis on the week in health Get our free Health Check email Get our free Health Check email Email * SIGN UP I would like to be emailed about offers, events and updates from The Independent. Read our Privacy notice Teenagers recovering from a concussion could experience a more rapid recovery by engaging with screens for over two hours a day, a new study