Cited by 748Evolutionary Psychology and Human BehaviorEvolutionary Game Theory and CooperationAnimal Behavior and Reproduction

The architecture of human kin detection

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Lieberman, Debra, Tooby, John, Cosmides, Leda·2007·Nature

Abstract

Evolved mechanisms for assessing genetic relatedness have been found in many species, but their existence in humans has been a matter of controversy. Here we report three converging lines of evidence, drawn from siblings, that support the hypothesis that kin detection mechanisms exist in humans. These operate by computing, for each familiar individual, a unitary regulatory variable (the kinship index) that corresponds to a pairwise estimate of genetic relatedness between self and other. The cues that the system uses were identified by quantitatively matching individual exposure to potential cues of relatedness to variation in three outputs relevant to the system's evolved functions: sibling altruism, aversion to personally engaging in sibling incest, and moral opposition to third party sibling incest. As predicted, the kin detection system uses two distinct, ancestrally valid cues to compute relatedness: the familiar other's perinatal association with the individual's biological mother, and duration of sibling coresidence.

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  • Incestuous sexual intercourse elicits core disgust because pathogen undetectability and lethal allele homozygosity threaten genetic extinction.

    “Because pathogen undetectability and lethal allele homozygosity clearly threaten genetic extinction, incestuous sexual intercourse elicits core disgust (Lieberman et al. 2007).”

    From Disgusting Bodies, Disgusting Religion: The Biology of Tantra (2011) · cites this paper as Lieberman et al. 2007

    The Methods (page unavailable) measure disgust at imagined sex with a sibling, and the Abstract (page unavailable) links mating between close relatives to deleterious recessives becoming homozygous and greater vulnerability to parasites. The paper does not characterize this as “core disgust,” describe pathogens as undetectable, or say these effects threaten genetic extinction. (LLM, conf=0.88)

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Research works printed but not linked: 4

  1. [10]Queller DC. Inclusive fitness in a nutshell. Oxford Surveys Evol Biol. 1989;6:73–109. [Google Scholar]
  2. [37]Hewlett B, Lamb M. Hunter–Gatherer Childhoods. Aldine Transaction; Somerset, New Jersey: 2005. [Google Scholar]
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  4. [39]Bernstein I. In: Kin Recognition. Hepper PG, editor. Cambridge Univ. Press; Cambridge: 1991. pp. 6–29. [Google Scholar]

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Authors
Lieberman, D., Tooby, J., & Cosmides, L.
Affiliations
  • University of Hawaiʻi at Mānoa (US)
  • University of California, Santa Barbara (US)
Corresponding author
Lieberman, Debra
Venue
Nature
Published
2007-02
Volume
445
Issue
7129
Pages
727-731
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2167697644
Cited by
748
References
47
Citations by year
2026: 13 · 2025: 16 · 2024: 42 · 2023: 24 · 2022: 33 · 2021: 60 · 2020: 66 · 2019: 33 · 2018: 46 · 2017: 40 · 2016: 47 · 2015: 38 · 2014: 48 · 2013: 36 · 2012: 58
FWCI
36.82
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Funders
National Institutes of Health (DP1OD000516)
Topics
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Evolutionary Psychology and Human Behavior
  • Social Sciences › Sociology and Political Science › Evolutionary Game Theory and Cooperation
  • Life Sciences › Agricultural and Biological Sciences › Ecology, Evolution, Behavior and Systematics › Animal Behavior and Reproduction
Keywords
genetic relatedness, inbreeding avoidance, human evolution, social cognition
MeSH terms
Adolescent, Adult, Altruism, Animals, Child, Child, Preschool, Cues, Data Collection, Humans, Incest, Infant, Infant, Newborn, Middle Aged, Models, Biological, Mothers, Sexual Behavior, Sibling Relations, Time Factors, Artifacts, Living Donors, Siblings, Heredity

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