LOS ANGELES — Children in lower-income families spend more time watching TV and using electronic devices than kids in more affluent homes, according to a survey released Thursday. The report by the nonprofit group Common Sense Media on the viewing habits of more than 1,400 children nationwide age 8 and under found that less-affluent youngsters spend nearly three-and-a-half hours daily watching TV and using varied devices including smartphones, tablets, laptops and video game players. By comparison, kids in higher-income homes spend just under two hours on such activities.