I have a new paper coming out in Psychological Science with Sara Khan, William Levine, and Jerald Kralik. The title of our brief report is: "Red signals dominance in male rhesus macaques." In the paper, we present the first experimental evidence that red signals dominance in nonhuman primates. Our results reveal that male monkeys would rather steal food from humans wearing blue or green than from humans wearing red. A similar predisposition in humans may explain the advantage conferred by wearing red in combat sports.
*UPDATE 6/9/11: The official psych science press release is now online and making the rounds on the interwebs.
*UPDATE 8/17/11: This paper appears in the August 2011 issue. Contact me for a PDF.