Noted: Shawn Green, an assistant professor of psychology at the University of Wisconsin-Madison, believes that games like Call of Duty develop retained skills specifically because they are fun. Games created with the sole intent to improve cognition are what he referred to at a panel at the University of California, San Francisco, as “chocolate-covered broccoli.” The level of genuine engagement in the game correlates with how likely the player is to retain the skills necessary to play it.