In a report for the International Society for Research on Aggression, experts have recently concluded that evidence supports the claim that violent media—especially including violent video games—can, indeed, act as a trigger for aggressive thoughts or feelings already present.
They also claim that feeding on violent images in movies or video games can increase the risk of aggression in the form of intentional verbal or physical harm to another person.
Repeated use of violent media pushes violent feelings to the surface more easily, which can lead to aggression in real-world situations with other people. The experts recommend that parents carefully monitor if and how their children use such media (Eddie Wrenn, "Violent Images in Movies, TV or Computer Games CAN Act as Triggers for Aggression, Says New Report," DailyMail.co.uk, Aug. 29, 2012).
Though the effects of violent images in media has long been debated, those who know the Word of God can easily see that constantly feeding our minds with this kind of entertainment will lead from thought to word to behavior (see Matthew 15:18-19; Luke 6:45). God tells us to instead fill our minds with positive things (Philippians 4:8).