New studies also reveal that, not only the type of video game, but the amount of time played is correlated with effects on behavior. The "magic number" is seen at one hour/day. Children and teenagers ages 10-15 who play one hour or less a day report being happier and more satisfied in life. The same study found that kids of the same age range who played video games 3 or more hours/day were less satisfied with their lives and had more personal and social difficulties.
Perhaps most interesting, kids who do not play video games at all may develop problems with socialization and adaptation in the digital world. So...too much, too little, the right type and the wrong type; it is complicated. The most important aspect in all of this is the quality of the child's relationship at home with the caregivers.
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