“There are dozens of well-designed studies that show that TV, movies and other media affect what viewers believe and how they behave. This is true of many different kinds of attitudes and behaviors
–positive and negative –but many studies conclusively show a statistical link between watching violent programs and behaving aggressively. And, of course, billions of dollars have been spent on media advertising because it is well established that even brief messages can be powerful in shaping behavior. However, there are very few studies of whether exposure to media violence causes criminal behavior.” Diana Zuckerman –What is to Blame for Youth Violence?: The Media, Guns, Parenting, Poverty, Bad Programs, Or? (Nat’l Center for Policy)
I found this link on Donna Hibbs’s Media Issues Weblog,” which looks like it will be worth watching.