CogBlog – A Cognitive Psychology Blog

If you spend any time on Twitter, you may have seen a tweet last fall reacting to a YouGov survey. The survey, conducted by the British market research firm YouGov, asked people about their tennis abilities and how they thought they’d perform in a match against Serena Williams. 12% of men surveyed said that if they were playing their very best tennis, they think they’d be able to win a point off of Serena Williams. 12%!!! That’s 1 in 8!! These are average, everyday British men, talking about scoring a point against the tennis player with the most Grand Slam titles in their career. In reality, these people would be lucky to even touch one of the balls hit at them by Serena Williams. So why do they have this overinflated sense of their tennis abilities? This is only one example of the Dunning-Kruger effect, a metacognitive idea that influences many aspects of our everyday lives, from wine-tasting to practicing medicine.