If somebody tells you an ostensible fact about human behavior or human thought and shows you a picture of an fMRI at the same time, are you more likely to believe what you've just been told? There's a debate within science right now about whether people are more easily lead astray by brain imaging, or whether those rainbow pictures of the mind affect our thinking much at all. Some studies show one result. Some show another. At Scientific American Mind, Jay Van Bavel and Dominic Packer explain why both sides might be right in this fight. It's a neat reminder that answers aren't always binary.