The irrelevance of utilitarianism in human moral judgements

Some time back there was an article on hacker news that suggested that human brains morality-evaluating circuits weren't tuned towards utilitarianism. Like: not at all! We know that all sorts of human moral idiosyncrasies govern humans decisions in eg. trolley-problems, but it has always been assumed that, all things equal, utilitarian considerations would have a final call on our moral judgements. Well, this paper argued that that just wasn't true. But, I have forgotten the papers name, and Google has left me empty handed when searching for this article. Can any of you guys help me out?