There is no better way to shatter someone's "we are all the same" illusion than to show pictures of a monkey, a panda and a banana to someone from Japan and someone from Britain. Ask them which two images go together. Chances are, the Japanese will pick the monkey and the banana, because they have a functional relationship: the former eats the latter. The Brit will select the panda and the monkey, because they are both mammals. As Richard Nisbett of the University of Michigan described in his 2003 book, "The Geography of Thought: How Asians and Westerners Think Differently … and Why," Westerners typically see classifications where Asians see relationships. He means "see" literally. When students in one study looked at tanks holding a large fish, a bunch of small fry and the usual aquarium plants and rocks, the Japanese later said they'd seen lots of background elements; the Americans saw the big fish.Now a new hypothesis from evolutionary psychology suggests that these cognitive traits could have been the result of natural selection driven by disease-causing microbes, i.e., in pathogen-rich environments, tendencies towards collectivism were adaptive (i.e., you were more likely to survive), whereas where there were fewer pathogens, populations had the luxury of evolving more ruggedly individualistic tendencies:
A reluctance to interact with strangers can protect against pathogens because strangers are more likely to carry strange microbes that the group lacks immunity to, says Mark Schaller of the University of British Columbia; xenophobia keeps away strangers and their strange bugs. Respect for traditions also works: ways of preparing food (using hot pepper, say, which kills microbes), rules about hygiene and laws about marriage (wed only in-group members, whose microbes you're probably immune to) likely arose to keep pathogens at bay. "Conformity helps maintain these buffers against disease," says Corey Fincher of the University of New Mexico; mavericks are dangerous. In places with a high prevalence of pathogens, such cultural traits—which happen to be the hallmarks of societies that value the group over the individual—would be adaptive. Put another way, societies that arose in pathogen-rife regions and did not have such traits would be wiped out by disease. Societies that did have them would survive.
When the scientists examined how closely collectivism tracked the prevalence of pathogens, they found a strong correlation, they will report in Proceedings of the Royal Society B. In general, tropical regions have more pathogens, and societies there tend to be more group-oriented than those at higher latitudes. Ecuador, Panama, Pakistan, India, China and Japan are the world's most group-first societies—and historically have had the highest prevalence of natural pathogens due to their climate and topography. The most individualistic are in Northern Europe and the United States, where there have historically been fewer native pathogens. For years scientists have scratched their heads over why collectivism declines with distance from the equator, and why living in colder regions should promote individualism (you'd think polar people would want to huddle together more). The answer seems to be that equatorial regions breed more pathogens.The research acknowledges that nurture and culture play a significant role (i.e., Asian immigrants in America soon become as individualistic as other members of their adoptive society), so any genetic bias may be a subtle one. Though when a number of individuals form a civilisation, it may only take a slight cognitive bias to change the basic cultural assumptions that evolve.
On the other hand, given that the research is of American and Canadian (i.e., Western) origin, perhaps it rests on a western, individualist cultural bias. Which doesn't necessarily invalidate it, though it makes one wonder how a Japanese or Chinese evolutionary psychologist would theorise the origins of the differences between individualist and collectivist societies.
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