“When people do something immoral, people tend to say things like, ‘No, that can’t be right,’ or ‘I can’t believe it,'” Phillips said. “There’s a sense that the brain treats these kind of things similarly to how it would react if someone told you it is possible to turn your hat into a candy bar, or something equally impossible.”

There may be good reason for the brain to react that way, Cushman said.

Read more from Harvard at PNAS