Reductions in Organic Chemistry

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It not only creates the sense of altruism that exists among genetically related family members, but also establishes boundaries regarding sexual relations within the nuclear family. Questions have persisted, however, regarding the means by which humans recognize family members — particularly siblings — as close genetic relatives. A team of researchers at the University of California, Santa Barbara, has found evidence of a nonconscious mechanism in the human brain that identifies genetic siblings on the basis of cues that guided our hunter-gatherer ancestors.

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Their findings will be published in the February 15 issue of the science journal Nature. In a study involving more than test subjects, the researchers found that people felt more altruistic toward individuals this mechanism recognized as siblings, and, at the same time, felt a greater aversion to engaging in incestuous sexual relations with them. Now we see the evolution of a mechanism that finely regulates important aspects of human social behavior," said John Tooby, professor of anthropology and co-director of the Center for Evolutionary Psychology at UCSB.

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He completed the study with Leda Cosmides, professor of psychology and also co-director of the Center for Evolutionary Psychology, and Debra Lieberman, a former student at the center and now a professor of psychology at the University of Hawaii. Mechanisms such as the one identified in the current study have been found in many species, he added, but their existence in humans had been a matter of controversy.

According to the researchers, the development of altruism between siblings is a result of natural selection, as are their aversions to sexual relations with one another and their aversion to sexual relations among siblings in general. The study's findings indicate these sensibilities are not primarily a result of socialization by parents or peers, but of motivational systems that evolved to respond to cues of genetic relatedness.

The question the researchers sought to answer was how siblings recognize their close genetic matches.

Genes and genetics explained

Drawing on the socioecology of ancestral human foragers they found the answer in a set of cues that enable humans to identify their brothers and sisters as siblings. For older siblings, what the researchers refer to as "maternal perinatal association" — seeing their mothers care for infant siblings — activates the mechanism in the brain, which, in turn, increases feelings of both altruism and sexual aversion toward younger brothers and sisters.

Lecture 10 - Family, Kinship, and Descent

This cue, however, is unavailable to younger siblings whose birth order precludes the opportunity of watching their mothers care for older brothers and sisters. For these siblings, the mechanism is triggered by the amount of time they live together as a family during the period from the younger siblings' infancy through adolescence. The researchers found that this "co-residence" regulates sibling altruism and sexual aversion toward adopted and step-siblings as well — individuals whom the subjects consciously believe to be genetically unrelated.