Video games are built on a series of triggers, moments that are designed to make the player react emotionally. Some of these are simple, like firing a gun at the baddies, others are more complex, like a conversation with a friendly character. Setting off these triggers creates emotional rewards for the player. These days, most of the triggers in games revolve around violence. Shooting, stabbing, slow-motion beheadings, the usual. Some people have a problem with that, what with violence being a nasty thing in reality. What if neuroscience was used to discover powerful triggers that don’t involve turning someone inside-out? Edge has the story.