“When people pondered the dilemmas that required killing someone with their bare hands, several networks in their brains lighted up. One, which included the medial (inward-facing) parts of the frontal lobes, has been implicated in emotions about other people. A second, the dorsolateral (upper and outer-facing) surface of the frontal lobes, has been implicated in ongoing mental computation (including nonmoral reasoning, like deciding whether to get somewhere by plane or train). And a third region, the anterior cingulate cortex (an evolutionarily ancient strip lying at the base of the inner surface of each cerebral hemisphere), registers a conflict between an urge coming from one part of the brain and an advisory coming from another.
But when the people were pondering a hands-off dilemma, like switching the trolley onto the spur with the single worker, the brain reacted differently: only the area involved in rational calculation stood out. Other studies have shown that neurological patients who have blunted emotions because of damage to the frontal lobes become utilitarians: they think it makes perfect sense to throw the fat man off the bridge. Together, the findings corroborate Greene’s theory that our nonutilitarian intuitions come from the victory of an emotional impulse over a cost-benefit analysis.”
Fascinating stuff.
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