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From "The Five Biggest Neuroscience Developments of the Year" in slate.com

"2. The neural alteration of morality. Six people with damage to the ventromedial prefrontal cortex were presented with moral dilemmas (e.g., would you smother a baby to prevent bad guys from finding and killing people in hiding) and were found to be two to three times more willing to kill than people without brain damage. The advertised conclusion is that such willingness to kill is objectively immoral. The feared conclusion is that if brain design determines what's moral, you can change morality by changing the brain—and once technology manipulates ethics, ethics can no longer judge technology."