We all have that friend who "knows everything," wins at trivia and can have a conversation on just about any topic and seem knowledgeable. Turns out, these smarty-pants have very efficiently paved brains, a new study suggests.
A group of neuroscientists at the Ruhr-University Bochum and Humboldt University of Berlin, both in Germany, analyzed the brains of 324 people with varying degrees of general knowledge (like the kind of information that would come up in a game of trivia). Researchers gave these participants over 300 questions touching on various fields, such as art, architecture and science, to gauge the individuals' level of general knowledge, also known as semantic memory.
Investigators used a kind of magnetic resonance imaging known as diffusion tensor imaging to track the water that flows around the brain — which typically follows along the paths paved between brain cells. So, by tracking the water during brain scans, the researchers were able to "see" the connections. [Inside the Brain: A Photo Journey Through Time]
Results showed that those subjects who had retained, and could recall, more general knowledge had much more-efficient brain connections — stronger and shorter connections between brain cells. But the researchers didn't find any association between more general knowledge and more brain cells.
It makes sense that people who have more general knowledge have more-efficient brain connections, said study lead author Erhan Genc, a researcher in the Department of Biopsychology at the Ruhr-University Bochum.
Different bits of general knowledge get stored in various spots across the brain, he said. Imagine a simple question: What year did the moon landing happen? We might have "moon" stored in one area, "moon landing" in another and even the year the event happened in another. So, in order to answer the question, the brain has to connect "moon" to "moon landing" to "year," and it does so through these connections. It stands to reason that if the connections are more efficient, that information can travel quickly and easily, he said. [What If Humans Were Twice As Intelligent?]
But it's not clear why some people have more-efficient brain connections than others, he added. Perhaps some people are born with a more efficient brain architecture, or perhaps someone who acquires more general knowledge also generates more-efficient connections, because they use this knowledge all the time.
"With our study, we cannot solve this issue," Genc told Live Science. In order to do that, the researchers would need to track individual people across time to see how their brains change — something the scientists hope to look at in the future.
Being able to retain general knowledge doesn't necessarily mean that you're "smarter," Genc added. That's another kind of intelligence, called "fluid intelligence," which is more about being able to problem-solve in new situations, he said. However, there is a slight correlation between smartness and greater general knowledge, he said.
The findings were published July 28 in the European Journal of Personality.
Originally published on Live Science.