I recommend people pick up the latest SciAm Mind. I'd type out the articles but it's ridiculously long. The opening paragraph of the one quoted in the title:
http://www.sciamdigital.com/index.cfm?fa=Products.ViewIssuePreview&ARTICLEID_CHAR=CBABCA99-3048-8A5E-105B37636ADE51C8In the easiest sense, it shows that people with "damage" (not sure how they assess that) to their ventromedial prefrontal cortex are more likely to adopt utilitarian choices for saving the most people it can, rather than the more "normal", whereby everyone would rather let everyone die. However, these findings short of shifted when playing the "ultimatum game," where emotion took over between the "damaged" subjects.
I will digress some problems I have with their methods.
1. They assume their subjects are telling the truth.
2. They don't consider thousands of years of evolution, or express how their findings would differ under a less tainted, and less socialized mind.
3. The studies are young, but they make no real effort at a conclusion.
I will, however, post a nice comment found in it:
"I think there may be a bit of a misunderstanding. Utilitarians would be extremely likely to give to charity that distributes bed nets in Africa, for example, because the good of saving lives far exceeds anything that person could spend money on (assuming he is relatively well off). Recognizing the good to humanity of raising a good, functional child, he may well win father of the year. Recognizing the good that affection brings, he may well be very affectionate and loving. Utilitarianism does not imply acting robotically. It just means that one acts in a way that attempts to maximize the happiness of all sentient beings from now until infinity.
Furthermore, all morality is based on assumptions. There is no "right" ethical system. But utilitarianism in particular can be constructed by combining notions of valuing happiness and having infinite empathy (valuing every individual as one values oneself). It's not a lack of empathy that brings about utilitarianism. It is full empathy."