concepts separately: one region for concepts related to vision, for example, another for concepts related to emotion. And conventional wisdom said the left hemisphere was most important.
Previous studies, though, tested just single words or sentences, and made only rough estimates of where meaning showed up in the brain, Gallant says. That’s like looking at the world’s countries in Google maps,
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, instead of zooming in to the street view.
So he and colleagues
mapped the activity of some 60,000 to 80,
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,000 pea-sized regions across the brain’s outer layer, or cerebral cortex,
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, as people lay in a functional MRI machine and listened to stories from The Moth Radio Hour. (The program features people telling personal,
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, narrative tales to a live audience.)
“People actually love this experiment,
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,” Gallant says.
It stands out from others because the authors use “real life,
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, complicated stories,” says Princeton University neuroscientist Uri Hasson. “That’s really meaningful to see how the brain operates.”
Gallant’s team used a computer program to decipher the meaning of every 1- to 2-second snippet of the stories and then cataloged where 985 concepts showed up in the brain. Meanings conveyed by different words didn’t just engage the left hemisphere,
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, the team found, but instead switched on groups of nerve cells spread broadly across the brain’s surface. After mapping where meaning, or semantic content, was represented in the brain,
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, the researchers figured out where individual words might
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