What scholars have to say?

Department of Psychology at the University of Toledo released the study with the purpose to examine relationships among violence exposure in the media and in real-life and desensitization as reflected in empathy and attitudes toward violence. As anticipated, exposure to video game violence was associated with lower empathy and stronger proviolence attitudes. This finding provides further support for concern about children’s exposure to video game violence, particularly if granted that lower empathy and stronger proviolence attitudes indicate desensitization to violence. In violent video games empathy is not adaptive, moral evaluation is often non-existent, but proviolence attitudes and behaviors are repeatedly rewarded (Funk, 2004). Such study proves that there is a relationship between media violence and desensitization of children.
http://docs.google.com/viewer?

a=v&q=cache:qoKdSLlBZJQJ:www.lionlamb.org/research_articles/study%25202.pdf+http://www.lionlamb.org/research_articles/study%25202.pdf&hl=sk&pid=bl&srcid=ADGEESjkoe_DdpBIqE9ZHw9RZ6tFhMt_K9OADPuhNoWEUT7DQ8bRSUKdR4J9_TYdbkpMJy5RKb4c8wm2AydJsmzdEzoE6Gh6cydoFUyTQk27jt6JjARYGR6HNv2WUS2RjJLz23Xut8g-&sig=AHIEtbS8Qg0Np7_Aa3IfCg5l_n6Eu6wPTQ

The study called “The Influence of Media Violence on Youth” conducted the research on violent television and films, video games, and music, which reveals evidence that media violence increases the likelihood of aggressive and violent behavior in both immediate and long-term contexts. The findings claim that short-term exposure increases the likelihood of physically and verbally aggressive behavior, aggressive thoughts, and aggressive emotions, and large-scale longitudinal studies provide converging evidence linking frequent exposure to violent media in childhood with aggression later in life, including physical assaults and spouse abuse (Anderson, 2003). This research supports the arguments that exposure to media violence influence children and adolescents in a negative way. 

http://docs.google.com/viewer?a=v&q=cache:S_-8PLrPXJcJ:www.psychologicalscience.org/pdf/pspi/pspi43.pdf+the+influence+of+media+violence+on+youth&hl=sk&pid=bl&srcid=ADGEESgfh46XlGeTLUB9daZtCZC2fL7PtEn3qxgHVOr1fdJqY_nJv2fJpTnXe2ixhFom8uWB7Co4JtJElJ3TOXzdz2HpTdocfTNha4UFY5D5ExnewySP_vY9PqlncKiEPoUEsylfXiaC&sig=AHIEtbQLlxiycETBW90xSWcP_Bd7d-1ChQ

References

Anderson, Craig A., Leonard Berkowitz, Edward Donnernstein, Rowell Huesmann, James D. Johnson, Daniel Linz, Neil M. Malamuth, and Ellen Wartella. "The Influence Of Media Violence On Youth." Psychological Science In The Public Interest 4 (2003). Print. 

Funk, Jeanne B., Heidi Baldacci, Tracie Pasold, and Jennifer Baumgardner. "Violence Exposure in Real-life, Video Games, Television, Movies, and the Internet: Is There Desensitization?" Journal of Adolescence 27 (2004). Print.