A Notification from Your Favorite App (IMAGE) University of Washington Caption UW researchers found a series of triggers, common across age groups, that start and end habitual smartphone use. Credit Jonathan Tran/University of Washington Usage Restrictions Available for reuse with appropriate credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.