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In page School shooting:

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A summation of past research on video game violence finds that video games have little to no effect on aggression. (Anderson, 2004; Ferguson, 2007 & Spencer, 2009) Again, this supports the idea that although it is a popular opinion to link school shooters to being violent video gamers; this misconception is often attributable to third variables and has not been supported by research on the connection between aggression and gaming.[citation needed]