The Paper of Record has this article on a study claiming that people are more likely in a video game to think that a black person is carrying a weapon than a white person (as opposed to objects like cell-phones). Since the difference is so small, i wonder whether anyone's thought of chalking it up to how much more visual contrast there is with a white hand holding a gun than a black one... It'd be simple to test, just have them put gloves on. (please no OJ jokes.)