Impostor syndrome – the feeling that you're a fraud, and any day now you'll be exposed – is presumably even more common than surveys suggest: after all, it's not the kind of thing to which people like to admit. Indeed, it can be hard to tell when you've got it: those others might have a syndrome, your reasoning goes, but I'm genuinely out of my depth. It's a classic case of "comparing your insides with other people's outsides": you have access only to your own self-doubt, so you mistakenly conclude it's more justified than anyone else's. This is a strange kind of self-doubt, when you think about it, since it's premised on the idea that you're highly talented at something, namely deception. Still, it's no fun, and if new research is anything to go by, it might be harder to cure than anyone thought.