Is your brain building maps to navigate the people around you?
In short: The 'six degrees of separation' concept is more than a social parlor game. It is a fundamental principle helping scientists decode the structure of the internet, the spread of epidemics, and the complex neural networks inside your own brain.
The concept of six degrees of separation suggests that any two people on Earth are linked by six or fewer social connections. This idea emerged roughly a century ago, fueled by the rapid expansion of social networks as telephones and airplanes made the world feel significantly smaller. While once viewed primarily through the lens of social psychology, the phenomenon is now a vital tool for understanding diverse systems, from digital internet structures to the mechanics of infectious disease outbreaks. This concept gained momentum as modern transport and communication technologies shrank global distances. It has transitioned from a mere social curiosity into a crucial scientific framework.
Recent research led by Oriel FeldmanHall and Apoorva Bhandari at Brown University suggests that humans navigate these social networks using mental maps, a process strikingly similar to how mice navigate physical mazes. In a study involving 146 Brown University students, researchers used a computer flashcard game to see how people learn connections within a network of 13 individuals. Participants were never shown the full network, only specific connections between pairs of people.
The study found that subjects were more successful at routing messages through the network after a night of sleep, even when the path spanned different communities. This improvement suggests that the brain may use a cognitive process called 'replay.' Much like how we consolidate physical memories, the brain appears to mentally simulate social connections—such as learning a coworker is friends with a cousin—to build a functional map of the social world.
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Sources
- Summary by Intellect · source: How The Six Degrees Phenomenon Has Changed Science
- Also: Brown researchers decipher how the human brain performs six degrees of separation
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