 Most people respond to these cases by saying that Trolley is permissible while Bridge is not. But what explains this difference in moral response? Many philosophers have argued for deontological constraints prohibiting murdering some to save others, as in Bridge; they regard the case of diverting a public threat toward lesser harm, as in Trolley, as an exception, and offer principled reasons for doing so, thus justifying our treating the two cases differently (e.g., Thomson 1985). Greene (2008, 42–44) dismisses such normative explanations as unconvincing and takes a very different tack, highlighting another difference between Trolley and Bridge: whereas the harm done in Bridge (shoving a man to his death) is “up close and personal”, the harm done in Trolley (by flipping a switch) is not. This difference corresponds to a difference in the strength of emotional response, the response to “personal” harm being much stronger; and this in turn corresponds to a difference in the brain regions most active when the cases are contemplated: Bridge tends to activate areas associated with social/emotional processing (the posterior cingulate cortex, the medial prefrontal cortex, and the amygdala) while Trolley produces activity in areas associated with higher cognition (the dorsolateral prefrontal cortex and the inferior parietal lobe).