https://www.sciencedaily.com/releases/2018/10/181029150931.htm

Even after only one hour of screen time daily, children and teens may begin to have less curiosity, lower self-control, less emotional stability and a greater inability to finish tasks, reports San Diego State University psychologist Jean Twenge and University of Georgia psychology professor W. Keith Campbell.

Twenge and Campbell's results were published in an article, "Associations between screen time and lower psychological well-being among children and adolescents: Evidence from a population-based study," which appeared this month in Preventative Medicine Reports.