New study deconstructs Dunbar’s number

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Does the mind restrict our social capability, in monkeys in addition to people? Credit: Johan Lind/N

An particular person human can keep steady social relationships with about 150 individuals. This is the proposition generally known as “Dunbar’s number”—that the structure of the human mind units an higher restrict on our social lives. A brand new study from Stockholm University signifies {that a} cognitive restrict on human group sizes can’t be derived on this method.

Dunbar’s number is called after the British anthropologist Robin Dunbar, who proposed the idea within the Nineteen Nineties. The number 150 relies on an extrapolation of the correlation between the relative measurement of the neocortex and group sizes in non-human primates. Some empirical research have discovered help for this number, whereas different have reported different group sizes.

“The theoretical foundation of Dunbar’s number is shaky. Other primates’ brains do not handle information exactly as human brains do, and primate sociality is primarily explained by other factors than the brain, such as what they eat and who their predators are. Furthermore, humans have a large variation in the size of their social networks,” says Patrik Lindenfors, Associate Professor of Zoological Ecology at Stockholm University and the Institute for Futures Studies, and one of many authors of the study.

When the Swedish researchers repeated Dunbar’s analyses utilizing fashionable statistical strategies and up to date information on primate brains, the outcomes had been concurrently a lot bigger and much decrease than 150.

The common most group measurement typically turned out to be decrease than 150 individuals. But the primary drawback was that the 95% confidence intervals for these estimates had been between 2 and 520 individuals.

“It is not possible to make an estimate for humans with any precision using available methods and data,” says Andreas Wartel, co-author of the study.

“Dunbar’s number” is commonly cited and has had an incredible affect in fashionable tradition, not the least after that includes prominently in Malcolm Gladwell’s e-book “The Tipping Point.” In 2007, Swedish media reported that the Swedish Tax Authority reorganized their places of work to remain throughout the 150-person restrict.

“This reorganization would then be based on the implicit but hopefully unintended assumption that their employees have neither family nor friends outside of work,” says Patrik Lindenfors, and provides, “I think Dunbar’s number is widely spread, also among researchers, since it’s so easy to understand. Our claim that it is not possible to calculate a number is not quite as entertaining.”

Ideas resembling Dunbar’s number spotlight questions concerning the lengthy attain of the gene.

“Are human social interactions genetically limited via the genes’ influence on the brain’s architecture? New research on cultural evolution has revealed the importance of cultural inheritance for what humans do and how we think. Culture affects everything from size of social networks to whether we can play chess or if we like hiking. Just like someone can learn to remember an enormous number of decimals in the number pi, our brain can be trained in having more social contacts,” says Johan Lind, deputy director of the Centre for Cultural Evolution at Stockholm University and co-author of the study.


Study suggests optimum social networks of not more than 150 individuals


More data:
‘Dunbar’s number’ deconstructed, Biology Letters, royalsocietypublishing.org/doi … .1098/rsbl.2021.0158

Provided by
Stockholm University


Citation:
Yes, you may have greater than 150 buddies: New study deconstructs Dunbar’s number (2021, May 4)
retrieved 4 May 2021
from https://phys.org/news/2021-05-friends-deconstructs-dunbar.html

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