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Monday, April 27, 2026

Why False Claims Seem Truer the More You Hear Them - Time Magazine

People only use about 10% of their brain. It’s a fact we’ve all heard—except it isn’t a fact at all. It’s a myth.

While activity in some brain regions fluctuates depending on what you’re doing, you use pretty much all of your brain, all of the time. And yet according to surveys of teachers conducted around the world, about half said they believed this 10% myth to be true.

How do such falsehoods make their way into our (fully utilized) brains? One way, it turns out, is through repeated encounters: The more we hear a particular claim or piece of information, the more we tend to give it credence—regardless of whether it’s true.

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“When we're exposed to a piece of information repeatedly, it seems truer than the first time we heard it,” says Sarah Barber, an associate professor of psychology at Georgia State University who studies human memory and truth estimations.

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