bill: factor follow up segment tonight. as i said adam lanza to ho killed last week was angry alien nighted guy and he may have been addict to the video games. how did i know that? one look at the guy. cnn reporting that people who knew lanza say he was a compulsive game player in his basement that s what he did. joining us now from columbus, ohio a teacher at ohio state and studied the violent video game culture. what s the most important thing you learned about the culture, professor? well, i have been study violent media effects for over 25 years and conducted over 50 studies we recently conducted comprehensive review of all studies 381 of them involving 130,000 participants and these studies show that violent video games increase aggressive thoughts. they increase angry feelings. they increase physiological arousal such as heart rate and blood pressure.