New Study Shows That There Is No Link Between Violent Video ...

That is because this study used a combination of subjective and objective data to measure teen aggression and violence in games. Compared to previous research on the subject, which relied on self-reported data from teenagers, this study used information from parents and carers to judge the level of aggressive behavior in their children.
What’s more, the content of the video games was classified using the official PEGI and ESRB rating systems, rather than just the player’s perceptions of the amount of violence in the game.
If you're curious about the sampling here, as you should be, then it comprised of British 14 to 15-year olds and an equal number of parents or carers, totaling 2,008 subjects in all.
The result of this thorough approach showed that there was no link between violent video games and teenage aggression, something that the lead researcher Professor Andrew Przybylski went on to clarify.
The idea that violent video games drive real-world aggression is a popular one, but it hasn’t tested very well over time. Despite interest in the topic by parents and policy-makers, the research has not demonstrated that there is cause for concern.
As Przybylski points out, this is not the first study to show these kinds of results and it is getting to the point now, that blaming video games for outbursts of teenage related aggression holds no weight. However, he did admit that trash talking online and other such behavior warranted further study.