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Limit of.the Number of People You Can Know

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Suggested cognitive limit important in sociology and anthropology

Dunbar'south number is a suggested cognitive limit to the number of people with whom one can maintain stable social relationships—relationships in which an individual knows who each person is and how each person relates to every other person.[one] [2] This number was first proposed in the 1990s by British anthropologist Robin Dunbar, who found a correlation betwixt primate brain size and average social grouping size.[3] By using the boilerplate human encephalon size and extrapolating from the results of primates, he proposed that humans can comfortably maintain 150 stable relationships.[4] There is some evidence that brain structure predicts the number of friends one has, though causality remains to be seen.[5] Dunbar explained information technology informally as "the number of people yous would not feel embarrassed about joining uninvited for a drink if you lot happened to bump into them in a bar."[half-dozen] Dunbar theorised that "this limit is a straight part of relative neocortex size, and that this, in turn, limits group size [...] the limit imposed by neocortical processing capacity is only on the number of individuals with whom a stable inter-personal relationship can be maintained". On the periphery, the number also includes by colleagues, such every bit loftier school friends, with whom a person would want to reacquaint themselves if they met again.[vii] Proponents affirm that numbers larger than this generally crave more restrictive rules, laws, and enforced norms to maintain a stable, cohesive group. It has been proposed to lie between 100 and 250, with a commonly used value of 150.[8] [ix]

A replication of Dunbar's analysis with a larger data set and updated comparative statistical methods has challenged Dunbar's number by revealing that the 95% confidence interval effectually the estimate of maximum human grouping size is much likewise large (4–520 and two–336, respectively) to specify any cerebral limit.[10]

Research background [edit]

Primatologists have noted that, owing to their highly social nature, primates must maintain personal contact with the other members of their social group, usually through social preparation. Such social groups function as protective cliques within the physical groups in which the primates live. The number of social group members a primate can track appears to exist express by the volume of the neocortex. This suggests that there is a species-specific alphabetize of the social group size, computable from the species' mean neocortical volume.[ commendation needed ]

In 1992,[1] Dunbar used the correlation observed for non-homo primates to predict a social grouping size for humans. Using a regression equation on data for 38 primate genera, Dunbar predicted a man "mean group size" of 148 (casually rounded to 150), a consequence he considered exploratory because of the large error measure (a 95% confidence interval of 100 to 230).[1]

Dunbar then compared this prediction with appreciable group sizes for humans. Offset with the assumption that the electric current hateful size of the human neocortex had developed most 250,000 years ago, during the Pleistocene, Dunbar searched the anthropological and ethnographical literature for census-like grouping size data for various hunter–gatherer societies, the closest existing approximations to how anthropology reconstructs the Pleistocene societies. Dunbar noted that the groups cruel into three categories—small, medium and large, equivalent to bands, cultural lineage groups and tribes—with corresponding size ranges of 30–50, 100–200 and 500–2500 members each.[ citation needed ]

Dunbar's surveys of village and tribe sizes also appeared to approximate this predicted value, including 150 as the estimated size of a Neolithic farming hamlet; 150 every bit the splitting point of Hutterite settlements; 200 every bit the upper spring on the number of academics in a bailiwick's sub-specialisation; 150 as the basic unit size of professional armies in Roman artifact and in modern times since the 16th century; and notions of appropriate company size.[ citation needed ]

Dunbar has argued that 150 would be the mean group size only for communities with a very high incentive to remain together. For a grouping of this size to remain cohesive, Dunbar speculated that as much as 42% of the group'due south time would have to be devoted to social grooming. Correspondingly, only groups under intense survival force per unit area,[ citation needed ] such equally subsistence villages, nomadic tribes, and historical military groupings, accept, on average, accomplished the 150-fellow member mark. Moreover, Dunbar noted that such groups are near ever physically close: "[...] we might look the upper limit on group size to depend on the degree of social dispersal. In dispersed societies, individuals volition meet less often and will thus exist less familiar with each other, then group sizes should exist smaller in consequence." Thus, the 150-member grouping would occur only because of absolute necessity—because of intense ecology and economic pressures.

Dunbar, in Grooming, Gossip, and the Evolution of Language, proposes furthermore that language may accept arisen every bit a "cheap" means of social training, allowing early humans to maintain social cohesion efficiently. Without linguistic communication, Dunbar speculates, humans would have to expend nearly half their fourth dimension on social grooming, which would have made productive, cooperative effort nearly impossible. Linguistic communication may have allowed societies to remain cohesive, while reducing the need for physical and social intimacy.[half-dozen] [11] This outcome is confirmed past the mathematical formulation of the social brain hypothesis, that showed that it is unlikely that increased brain size would have led to large groups without the kind of complex communication that just language allows.[12]

Applications [edit]

Dunbar's number has get of interest in anthropology, evolutionary psychology,[xiii] statistics, and business concern management. For instance, developers of social software are interested in it, equally they demand to know the size of social networks their software needs to take into account; and in the modern military, operational psychologists seek such information to support or refute policies related to maintaining or improving unit cohesion and morale. A recent study has suggested that Dunbar's number is applicable to online social networks[14] and advice networks (mobile phone).[fifteen] Participants of the European career-oriented online social network XING who take near 157 contacts reported the highest level of job offer success, which likewise supports Dunbar'south number of about 150.[16]

There are discussions in articles and books, of the possible application of using Dunbar'southward number for analyzing distributed, dynamic terrorist networks, cybercrime networks, or networks preaching criminal ideology.[17] [xviii]

Reactions [edit]

Alternative numbers [edit]

Anthropologist H. Russell Bernard, Peter Killworth and assembly have done a variety of field studies in the Us that came upwards with an estimated mean number of ties, 290, which is roughly double Dunbar's judge. The Bernard–Killworth median of 231 is lower, because of an up skew in the distribution, but still appreciably larger than Dunbar'southward approximate. The Bernard–Killworth approximate of the maximum likelihood of the size of a person's social network is based on a number of field studies using different methods in various populations. It is not an average of study averages only a repeated finding.[19] [xx] [21] Nevertheless, the Bernard–Killworth number has not been popularized equally widely as Dunbar'due south.

Criticism [edit]

A replication of Dunbar's analysis on updated complementary datasets using different comparative phylogenetic methods yielded wildly different numbers. Bayesian and generalized least-squares phylogenetic methods generated approximations of average group sizes betwixt 69–109 and 16–42, respectively. However, enormous 95% confidence intervals (4–520 and ii–336, respectively) unsaid that specifying any one number is futile. The researchers drew the decision that a cerebral limit on human grouping size cannot be derived in this manner. The researchers also critizised the theory behind Dunbar's number because other primates' brains do non handle data exactly as human brains do, because primate sociality is primarily explained past other factors than the encephalon, such as what they eat and who their predators are, and because humans accept a big variation in the size of their social networks.[x] Dunbar commented the option of data for this report, however, now stating that his number should not be calculated from data on primates or anthropoids, as in his original study, but on apes.[22] This would hateful that his cognitive limit would exist based on 16 pair-living gibbon species, 3 solitary orangutans, and only four group living smashing apes (chimpanzees, bonobos and ii gorilla species), which would not exist sufficient for statistical analyses.[ citation needed ]

Philip Lieberman argues that since band societies of approximately xxx–50 people are divisional by nutritional limitations to what grouping sizes tin be fed without at least rudimentary agriculture, big human brains consuming more than nutrients than ape brains, group sizes of approximately 150 cannot have been selected for in paleolithic humans.[23] [ dubious – discuss ] Brains much smaller than man or even mammalian brains are also known to be able to support social relationships, including social insects with hierarchies where each private "knows" its place (such every bit the paper wasp with its societies of approximately 80 individuals[24]) and figurer-fake virtual autonomous agents with simple reaction programming emulating what is referred to in primatology every bit "ape politics".[25]

Comparisons of primate species show that what appears to be a link between group size and encephalon size, and too what species do not fit such a correlation, is explainable past nutrition. Many primates that eat specialized diets that rely on scarce nutrient take evolved small brains to conserve nutrients and are express to living in minor groups or even alone, and they lower average brain size for alone or pocket-size group primates. Pocket-sized-brained species of primate that are living in large groups are successfully predicted by diet theory to be the species that consume nutrient that is abundant but not very nutritious. Along with the existence of complex deception in small-brained primates in large groups with the opportunity (both abundant food eaters in their natural environments and originally alone species that adopted social lifestyles under artificial food abundances), this is cited equally evidence against the model of social groups selecting for large brains and/or intelligence.[26]

Popularisation [edit]

  • Malcolm Gladwell discusses the Dunbar number in his pop 2000 book The Tipping Point. Gladwell describes the company West. L. Gore and Associates, now known for the Gore-Tex make. Past trial and error, the leadership in the company discovered that if more 150 employees were working together in one building, dissimilar social bug could occur. The visitor started edifice company buildings with a limit of 150 employees and merely 150 parking spaces. When the parking spaces were filled, the visitor would build another 150-employee building. Sometimes these buildings would exist placed only short distances autonomously. The company is also known for the open resource allotment company structure.
  • The number has been used in the study of virtual communities, especially MMORPGs, such every bit Ultima Online, and social networking websites, such as Facebook[27] (Dunbar himself did a study on Facebook in 2010[3]) and MySpace.[28]
  • The Swedish taxation authority planned to reorganise its functions in 2007 with a maximum 150 employees per office, referring to Dunbar's enquiry.[29]
  • In 2007, Cracked.com editor David Wong wrote a sense of humor piece titled "What is the Monkeysphere?" explaining Dunbar's number and its implications.[30]
  • In the 2012 novel This Book Is Total of Spiders, also by David Wong, the character Marconi explains to David the event Dunbar's number has on homo society. In Marconi'south explanation, the limit Dunbar's number imposes on the private explains phenomena such as racism and xenophobia, as well as apathy towards the suffering of peoples exterior of an individual's community.[31]
  • In a piece for the Financial Times (10 August 2018), titled 'Why potable is the secret to humanity'southward success' Dunbar mentioned two more numbers: an inner cadre of about v people to whom we devote nearly 40 percentage of our bachelor social time and 10 more people to whom we devote some other twenty percent. All in all, we devote about 2-thirds of our time to just 15 people.[32]
  • In episode 103 of the podcast Howdy Cyberspace (31 May 2018) Brady Haran and CGP Grayness discuss the reasons the number may exist limited to 150, including the power to continue track of political relationships in large groups of people and the amount of time that people have to devote towards developing and maintaining friendships.[33]
  • In the 2020 novel The Midnight Library by Matt Haig, the graphic symbol Ash references Dunbar'southward number, explaining that "humans are just capable of 150 social connections."

References [edit]

  1. ^ a b c Dunbar, R. I. G. (1992). "Neocortex size as a constraint on group size in primates". Journal of Homo Evolution. 22 (half-dozen): 469–493. doi:10.1016/0047-2484(92)90081-J.
  2. ^ Gladwell, Malcolm (2000). The Tipping Point – How Little Things Brand a Big Departure . Little, Brownish and Company. pp. 177–181, 185–186. ISBN978-0-316-34662-vii.
  3. ^ a b Reisinger, Don (25 January 2010). "Sorry, Facebook friends: Our brains tin't keep up". CNET . Retrieved ix Apr 2018. Dunbar has now decided to shift focus to run into whether Facebook has inverse the number.
  4. ^ Purves, Dale (2008). Principles of Cognitive Neuroscience. Sunderland, Massachusetts: Sinauer Associates. ISBN9780878936946.
  5. ^ Hampton, WH; Unger, A; Von Der Heide, RJ; Olson, IR (2016). "Neural connections foster social connections: a diffusion-weighted imaging study of social networks". Social Cognitive and Affective Neuroscience. 11 (v): 721–727. doi:10.1093/scan/nsv153. PMC4847692. PMID 26755769.
  6. ^ a b Dunbar, Robin (1998). Grooming, gossip, and the evolution of language (1st Harvard University Press paperback ed.). Cambridge, Massachusetts: Harvard University Press. p. 77. ISBN978-0674363366 . Retrieved 17 December 2016.
  7. ^ Bialik, Carl (16 November 2007). "Deplorable, Y'all May Have Gone Over Your Limit of Network Friends". The Wall Street Journal Online . Retrieved 2 December 2007.
  8. ^ Hernando, A.; Villuendas, D.; Vesperinas, C.; Abad, Grand.; Plastino, A. (2009). "Unravelling the size distribution of social groups with data theory on complex networks". Preprint. arXiv:0905.3704. Bibcode:2009arXiv0905.3704H.
  9. ^ "Don't Believe Facebook; You Merely Have 150 Friends". NPR.org. National Public Radio. 4 June 2011.
  10. ^ a b Lindenfors, Patrik; Wartel, Andreas; Lind, Johan (2021). "'Dunbar's number' deconstructed". Biology Letters. 17 (5): 20210158. doi:10.1098/rsbl.2021.0158. PMC8103230. PMID 33947220.
  11. ^ Dunbar, Robin (2004), "Gossip in Evolutionary Perspective" (PDF), Review of General Psychology, 8 (two): 100–110, CiteSeerX10.1.1.530.9865, doi:ten.1037/1089-2680.eight.2.100, S2CID 51785001, retrieved 24 January 2013
  12. ^ Dávid-Barrett, T.; Dunbar, R. I. G. (22 August 2013). "Processing power limits social group size: computational evidence for the cognitive costs of sociality". Proc. R. Soc. B. 280 (1765): 20131151. doi:10.1098/rspb.2013.1151. ISSN 0962-8452. PMC3712454. PMID 23804623.
  13. ^ Themudo, Nuno (23 March 2007). "Virtual Resistance: Internet-mediated Networks (Dotcauses) and Collective Action Confronting Neoliberalism" (PDF). University of Pittsburgh, University Center for International Studies. p. 36. Archived from the original (PDF) on 9 July 2009. Retrieved 2 December 2007.
  14. ^ Gonçalves, Bruno; Perra, Nicola; Vespignani, Alessandro (3 August 2011). "Modeling Users' Activity on Twitter Networks: Validation of Dunbar's Number". PLOS One. 6 (8): e22656. Bibcode:2011PLoSO...622656G. doi:x.1371/journal.pone.0022656. PMC3149601. PMID 21826200.
  15. ^ Miritello, Giovanna; Moro, Esteban; Lara, Rubén; et al. (2013). "Time equally a limited resources: Communication strategy in mobile phone networks". Social Networks. 35: 89–95. arXiv:1301.2464. Bibcode:2013arXiv1301.2464M. doi:10.1016/j.socnet.2013.01.003. S2CID 15913420.
  16. ^ Buettner, Ricardo (2017). "Getting a job via career-oriented social networking markets: The weakness of too many ties". Electronic Markets. 27 (4): 371–385. doi:10.1007/s12525-017-0248-three.
  17. ^ Norwitz, Jeffrey (July 2009). Pirates, Terrorists, and Warlords: The History, Influence, and Future of Armed Groups Around the World. Skyhorse. ISBN9781602397088.
  18. ^ "The optimal size of a terrorist network". globalguerrillas.typepad.com. March 2004.
  19. ^ McCarty, C.; Killworth, P. D.; Bernard, H. R.; Johnsen, E.; Shelley, M. (2000). "Comparing Two Methods for Estimating Network Size" (PDF). Human Organization. 60 (1): 28–39. doi:10.17730/humo.threescore.1.efx5t9gjtgmga73y.
  20. ^ Bernard, H. R.; Shelley, K. A.; Killworth, P. (1987). "How much of a network does the GSS and RSW dredge up?". Social Networks. 9: 49–61. doi:10.1016/0378-8733(87)90017-7.
  21. ^ H. Russell Bernard. "Honoring Peter Killworth's contribution to social network theory." Newspaper presented to the University of Southampton, 28 September 2006. http://nersp.osg.ufl.edu/~ufruss/
  22. ^ "Human being social networks might not be limited by Dunbars number – but Dunbar disagrees". The Academic Times. 4 May 2021. Retrieved five May 2021.
  23. ^ Lieberman, Philip (2013). The Unpredictable Species: What Makes Humans Unique . Princeton, N.J.: Princeton University Press. ISBN9780691148588.
  24. ^ Attenborough, David. Micro Monsters 3D.
  25. ^ Pfeifer, Rolf; Bongard, Josh (October 2006). How the Torso Shapes the Fashion Nosotros Call back: A New View of Intelligence. Cambridge, Massachusetts: MIT Press. ISBN9780262162395.
  26. ^ Alex R. DeCasien, Scott A. Williams & James P. Higham (2017). "Primate brain size is predicted past nutrition but not sociality"
  27. ^ "Primates on Facebook". The Economist. 26 February 2009.
  28. ^ 1 case is Christopher Allen, "Dunbar, Altruistic Penalisation, and Meta-Moderation".
  29. ^ "Swedish tax collectors organized by apes". The Local – Sweden's news in English. 23 July 2007. Archived from the original on sixteen Baronial 2007.
  30. ^ "What is the Monkeysphere?". 30 September 2007. Retrieved 23 Nov 2015.
  31. ^ Wong, David (2012). This Volume is Total of Spiders. NY: St. Martin'due south Press. pp. 295–296. ISBN978-0312546342.
  32. ^ Dunbar, Robin (10 August 2018). "Why drinkable is the secret to humanity'south success". Financial Times.
  33. ^ "H.I. 103: Don't Read The Comments". Howdy Cyberspace . Retrieved 23 Dec 2018.

Farther reading [edit]

  • Dunbar, R.I.M. (1993). "Coevolution of neocortical size, group size and language in humans". Behavioral and Encephalon Sciences. 16 (4): 681–735. doi:ten.1017/s0140525x00032325. S2CID 145583615.
  • Edney, J.J. (1981a). "Paradoxes on the eatables: Scarcity and the problem of equality". Journal of Community Psychology. 9: 3–34. doi:10.1002/1520-6629(198101)9:1<3::aid-jcop2290090102>3.0.co;2-b.
  • Healy, S. D.; Rowe, C. (2007). "A critique of comparative studies of brain size". Proceedings of the Majestic Society B: Biological Sciences. 274 (1609): 453–464. doi:10.1098/rspb.2006.3748. PMC1766390. PMID 17476764.
  • Sawaguchi, T.; Kudo, H. (1990). "Neocortical evolution and social structure in primates". Primates. 31 (two): 283–290. doi:10.1007/bf02380949. S2CID 36889347.

External links [edit]

  • "The ultimate encephalon teaser" – an commodity on Dunbar'due south inquiry at University of Liverpool Enquiry Intelligence
  • The Dunbar Number every bit a Limit to Group Sizes past Christopher Allen – applying Dunbar'southward number to on-line gaming, social software, collaboration, trust, security, privacy, and internet tools, by Christopher Allen
  • Robin Dunbar: How Many Friends Does 1 Person Need? Fora.TV talk at the RSA

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Source: https://en.wikipedia.org/wiki/Dunbar%27s_number

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