According to Professor Christopher Ferguson from Texas A & M International University, violent video games help in reducing stress and also have a positive effect on depression. This fact he found in a study of 103 students. The 62 men and 42 women in the study had the games Hitman: Blood Money, Call of Duty 2 and Madden. The latter was added to the test to see the effects of an action-packed, yet non-violent game. The study participants were tested in a special test for frustration.
There was no evidence that violent games have a positive or negative influence on the behavior in the laboratory. However, it is assumed that longer violent games can be helpful in decreasing in hostility and depression resulting from stressful job.
Finally, Ferguson believes that violent games should be viewed as a tool for people with disturbed emotions rather than aggression.