BRIAN & RUTH Bias #4 · Dunning-Kruger effect

Why are beginners so sure?

When we know a little, we think we know a lot.

What happened to Brian

The night before an exam, Brian read the notes once. He is sure he will ace it. Ruth freezes the scene: that was his brain, and it has a name.

The study

In 1999, Justin Kruger and David Dunning gave Cornell students a logic test. The weakest students beat only about 12 percent of the class, but they guessed they beat about 60 percent. Knowing little hides how little you know.

Feeling sure is not a measurement. Take a practice test, or ask someone who knows the topic, before you decide you have got it.

And with AI?

Soon AI will give everyone instant answers. Will that make us experts, or just more sure? Are we prepared for a full AI life? Tell us in the comments on YouTube, Instagram or TikTok.

Source: Kruger, J., & Dunning, D. (1999). Unskilled and unaware of it: How difficulties in recognizing one's own incompetence lead to inflated self-assessments. Journal of Personality and Social Psychology, 77(6), 1121-1134. Read the study (APA) · PubMed