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Author: search.filters.author.Tamas David-Barrett

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    Fertility, kinship and the evolution of mass ideologies
    (2017)
    Tamas David-Barrett
    ;
    Robin I.M. Dunbar
    Scopus© Citations 14  2
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    Communication with Family and Friends across the Life Course
    (2016)
    Tamas David-Barrett
    ;
    Janos Kertesz
    ;
    Anna Rotkirch
    ;
    Asim Ghosh
    ;
    Kunal Bhattacharya
      8Scopus© Citations 51
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    Language as a coordination tool evolves slowly
    (2016)
    Tamas David-Barrett
    ;
    Robin I. M. Dunbar
    <jats:p>Social living ultimately depends on coordination between group members, and communication is necessary to make this possible. We suggest that this might have been the key selection pressure acting on the evolution of language in humans and use a behavioural coordination model to explore the impact of communication efficiency on social group coordination. We show that when language production is expensive but there is an individual benefit to the efficiency with which individuals coordinate their behaviour, the evolution of efficient communication is selected for. Contrary to some views of language evolution, the speed of evolution is necessarily slow because there is no advantage in some individuals evolving communication abilities that much exceed those of the community at large. However, once a threshold competence has been achieved, evolution of higher order language skills may indeed be precipitate.</jats:p>
      9Scopus© Citations 12
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    Homophily in Personality Enhances Group Success Among Real-Life Friends
    (2020)
    Michael Laakasuo
    ;
    Anna Rotkirch
    ;
    Max van Duijn
    ;
    Venla Berg
    ;
    Markus Jokela
    Scopus© Citations 21  1
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    Herding Friends in Similarity-Based Architecture of Social Networks
    (2020)
    Tamas David-Barrett
    <jats:title>Abstract</jats:title><jats:p>Although friendship as a social behaviour is an evolved trait that shares many similarities with kinship, there is a key difference: to choose friends, one must select few from many. Homophily, i.e., a similarity-based friendship choice heuristic, has been shown to be the main factor in selecting friends. Its function has been associated with the efficiency of collective action via synchronised mental states. Recent empirical results question the general validity of this explanation. Here I offer an alternative hypothesis: similarity-based friendship choice is an individual-level adaptive response to falling clustering coefficient of the social network typical during urbanisation, falling fertility, increased migration. The mathematical model shows how homophily as a friend-choice heuristic affects the network structure: (1) homophilic friendship choice increases the clustering coefficient; (2) network proximity-based and similarity-based friendship choices have additive effects on the clustering coefficient; and (3) societies that face falling fertility, urbanisation, and migration, are likely go through a u-shaped transition period in terms of clustering coefficient. These findings suggest that social identity can be seen as an emergent phenomenon and is the consequence, rather than the driver of, homophilic social dynamics, and offer an alternative explanation for the rise of “fake news” as a societal phenomenon.</jats:p>
      2Scopus© Citations 15
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    Network Effects of Demographic Transition
    (2019)
    Tamas David-Barrett
    <jats:title>Abstract</jats:title><jats:p>Traditional human societies use two of biology’s solutions to reduce free-riding: by collaborating with relatives, they rely on the mechanism of kin-selection, and by forming highly clustered social kin-networks, they can efficiently use reputation dynamics. Both of these solutions assume the presence of relatives. This paper shows how social networks change during demographic transition. With falling fertility, there are fewer children that could be relatives to one another. As the missing kin are replaced by non-kin friends, local clustering in the social network drops. This effect is compounded by increasing population size, characteristic of demographic transition. The paper also shows that the speed at which reputation spreads in the network slows down due to both falling fertility and increasing group size. Thus, demographic transition weakens both mechanisms for eliminating free-riders: there are fewer relatives around, and reputation spreads slower. This new link between falling fertility and the altered structure of the social network offers novel interpretations of the origins of legal institutions, the Small World phenomenon, the social impact of urbanisation, and the birds-of-a-feather friendship choice heuristic.</jats:p>
      1Scopus© Citations 26