At the extreme, the less fortunate may not be seen as people at all. That was the finding of a study from Princeton University in which MRI scans were taken of several university students’ active brains while they viewed images of different people. Researchers saw that photographs of homeless people and drug addicts failed to stimulate areas of the brain that usually activate whenever people think about other people, or themselves. Instead, the (mostly affluent) students reacted to the images as if they “had stumbled on a pile of trash”.

How the super rich got richer