Why we pretend to know things, explained by a cognitive scientist

By Sean Illing

Why do people pretend to know things? Why does confidence so often scale with ignorance? Steven Sloman, a professor of cognitive science at Brown University, has some compelling answers to these questions.

“We’re biased to preserve our sense of rightness,” he told me, “and we have to be.”

The author of The Knowledge Illusion: Why We Never Think Alone, Sloman’s research focuses on judgment, decision-making, and reasoning. He’s especially interested in what’s called “the illusion of explanatory depth.” This is how cognitive scientists refer to our tendency to overestimate our understanding of how the world works.

We do this, Sloman says, because of our reliance on other minds.

“The decisions we make, the attitudes we form, the judgments we make, depend very much on what other people are thinking,” he said.

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