The Influence of Media Violence on Youth by Craig Anderson, Leonard Berkowitz, Edward Donnerstein, L. Rowell Huessman, James D. Johnson, Daniel Linz, Neil Malamuth and Ellen Wartella in Psychological Science in the Public Interest, December 2003.
Aggressive Youths, Violent Video Games Trigger Unusual Brain Acticity by the Indiana University School of Medicine, December 2, 2002. The study discusses how exposure to violent media may affect the brains of youths with aggressive tendencies differently than the brains of non-aggressive youths.
Children and Violent Video Games: Are There "High Risk" Players? by Jeanne B. Funk, a paper presented at Playing by the Rules, the Cultural Policy Challenges of Video Games Conference organized by the University of Chicago Cultural Policy Center, October 26-27, 2001.
Research Links
For a quick summary, you can read the press release about the study.
You can also read an AP news story on the Stanford study.
You can also read an APA Press Release about the study.