An anonymous reader writes "Give a monkey some spending money, and he'll blow it on pictures of women monkeys. He'll also pay to see dominant monkeys. But you'll have to pay him to look at inferior monkeys. That's the upshot of a study out of Duke that was designed to explore the 'social machinery of the brain with an eye toward helping autism patients.' Next up -- seriously -- the researchers want to run the same test on Joe Sixpack (sans the monkey business)."