• In the last 10 years, video games studies have been overwhelmingly popular compared to studies on other media.
  • Less than half of studies (41%) used well validated aggression measures.
  • Poorly standardized and unreliable measures of aggression tended to produce the highest effects, possibly because their unstandardized format allows researchers to pick and choose from a range of possible outcomes.
  • The closer aggression measures got to actual violent behavior, the weaker the effects seen.
  • Experimental studies produced much higher effects than correlational or longitudinal studies.  As experimental studies were most likely to use aggression measures of poor quality, this may be the reason why.
  • There was no evidence that video games produce higher effects than other media, despite their interactive nature.
  • Overall, effects were negligible, and we conclude that media violence generally has little demonstrable effect on aggressive behavior.

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