The Dunning-Kruger effect (by Alberto Moreno)

What this video is about

In this video, Alberto Moreno explains the Dunning-Kruger effect, a cognitive bias whereby many people see themselves as cleverer and more competent than they are and fail to recognise their own ignorance. He goes through the original 1999 study by David Dunning and Justin Kruger, in which the participants with the lowest scores on tests of grammar, logic and sense of humour clearly overestimated their performance. He also discusses other experiments, such as one in which most people claimed to know concepts invented by the researchers, and the finding that women tended to underestimate their scientific reasoning ability despite obtaining results similar to men.

The video links this effect to poor metacognitive ability, to the overconfidence that appears when we start learning something new and to other biases such as heuristics or confirmation bias. It also mentions the Peter principle and notes that experts tend to be more realistic, although they sometimes underestimate themselves.

As ways of reducing this bias, he suggests learning more about how the mind works, studying a subject in depth before giving an opinion, continuing to learn and asking for constructive criticism. He ends by recalling that Dunning and Kruger’s research received an Ig Nobel Prize in 2000.

Topics: Dunning-Kruger effect, cognitive biases, metacognition, social psychology