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The architecture of human kin detection
Debra Lieberman1, John Tooby, Leda Cosmides
1Center for Evolutionary Psychology, University of California Santa Barbara, Santa Barbara, California 93106, USA. debra@debralieberman.com
Nature
|February 16, 2007
Summary
Humans possess evolved kin detection mechanisms, contrary to prior debate. These systems calculate genetic relatedness using cues like shared upbringing, influencing altruism and incest aversion.
Area of Science:
- Evolutionary Psychology
- Human Behavior Genetics
- Social Neuroscience
Background:
- Assessing genetic relatedness is crucial for social behavior in many species.
- The existence and mechanisms of human kin detection have been debated.
- Previous research has not conclusively identified the cues used by humans to estimate relatedness.
Purpose of the Study:
- To provide evidence for the existence of human kin detection mechanisms.
- To identify the specific cues used by humans to compute genetic relatedness.
- To investigate the relationship between kin detection cues and evolved social behaviors.
Main Methods:
- Examined sibling relationships to gather converging lines of evidence.
- Quantitatively matched individual exposure to potential relatedness cues with behavioral outputs.
- Analyzed variations in sibling altruism, incest aversion, and moral opposition to sibling incest.
Main Results:
- Evidence supports the hypothesis that humans possess kin detection mechanisms.
- These mechanisms compute a "kinship index" estimating genetic relatedness.
- Perinatal association with the mother and duration of coresidence were identified as key cues.
Conclusions:
- Human kin detection mechanisms exist and are influenced by specific environmental cues.
- These mechanisms play a role in regulating altruistic behavior and incest avoidance among siblings.
- The findings resolve controversy regarding evolved kin recognition in humans.
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