He thus claims to show how perception makes possible demonstrative thought. This error carries over to his account of the relation between perceptual and demonstrative content as well. An fMRI Investigation Consider the following moral dilemma. A trolley is heading down a set of tracks toward five people who will be killed if it proceeds on its present course. You can save these five people by diverting the trolley onto a different set of tracks, one that has only one person on it, but if you do this that person will be killed.
Most people say yes.
Now consider a slightly different dilemma. Once again, a trolley is heading down a set of tracks toward five people. You are on a footbridge over the tracks next to a large man. The only way you can save these five people is to push this man off the bridge and into the path of the trolley. Most people say no.