Children who play violent video games are likely to display high levels of physical aggression, say researchers.
Two studies from Japan and the United States have shown that violent video games have harmful effects on kids and adolescents.
The study including more than 1,2000 Japanese youths aged between 12 and 18 as well as 364 children aged nine to 12 in the US has shown that despite cultural differences and disparities in crime rates, children across the spectrum were equally affected by violent video games.
"The [Japanese] culture is so different and their overall violence rate is so much lower than in the US.
"By gathering data from Japan, we can test that hypothesis directly and ask, 'Is it the case that Japanese kids are totally unaffected by playing violent video games?'
"And of course, they aren't. They're affected pretty much the same way American kids are," he added.
The study is published in journal Pediatrics.