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#kinselection

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DB Krupp

My paper with Wes Maciejewski on the Evolution of Extraordinary Self-Sacrifice is now featured in a special collection of articles on moral judgment and decision-making, so I thought it was a good time to share it here.

nature.com/articles/s41598-021

NatureThe evolution of extraordinary self-sacrifice - Scientific ReportsFrom a theoretical perspective, individuals are expected to sacrifice their welfare only when the benefits outweigh the costs. In nature, however, the costs of altruism and spite can be extreme, as in cases of irreversible sterility and self-destructive weaponry. Here we show that “extraordinary” self-sacrifice—in which actors pay costs that exceed the benefits they give or the costs they impose on recipients—can evolve in structured populations, where social actions bring secondary benefits to neighboring kin. When given information about dispersal, sedentary actors evolve extraordinary altruism towards dispersing kin. Likewise, when given information about dispersal and kinship, sedentary actors evolve extraordinary spite towards sedentary nonkin. Our results can thus be summed up by a simple rule: extraordinary self-sacrifice evolves when the actor’s neighbors are close kin and the recipient’s neighbors are not.
#SocialEvolution#cooperation#altruism
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Nadiah Kristensen

I read a really interesting #anthropology paper Jones (2000) and worked through a group #nepotism #model it describes,
which combines #GameTheory and #KinSelection, to explain key features of #cooperation within culturally-defined #kin groups.

nadiah.org/2022/11/10/group-ne

Nadiah KristensenGroup nepotism and the Brothers Karamazov GameI recently read a classic paper by anthropologist Jones (2000), ‘Group nepotism and human kinship’, which argues that collective action may explain some of the key features of human cooperation between kin. Collective action here is action by a group (e.g., clan, tribe) that has sufficient ingroup solidarity to decide how to act as a collective. The key features it may help explain are: 1. the ‘axiom of amity’, that one is obliged to help kin just because they’re kin; 2. that kin groups come in many sizes and can be quite large; and 3. that human notions of kinship can be very different from biological kinship, sometimes occurring between individuals with no known geneological relationship.
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