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NEWSFOCUS
P SYC H O LO G Y
making choices, being analytical in their
reasoning, being motivated to maintain a
highly positive self-image, and having a
tendency to rate their capabilities as above
average. Again, the review article contends,
this picture breaks down for people from
non-WEIRD societies: These groups tend
Relying on undergraduates from developed nations as research subjects creates a to place less importance on choice, be more
holistic in their reasoning, and be less confalse picture of human behavior, some psychologists argue
cerned with seeing themselves as above
Suppose you’re a psychologist at a research 96% of subjects were WEIRDos.
average. And although WEIRDos stand
university, trying to figure out what drives
This would be fine if WEIRDos were apart from the rest of the world in these and
human behavior. You have devised simple, representative of people from other cul- other respects, Americans stand even further
clever experiments in which people play tures, but they are not, Henrich, Heine, away, with U.S. undergraduates further away
economic games or perceive visual illusions, and Norenzayan argue in the BBS paper. still—“an outlier in an outlier population,”
and you would like large sample sizes. How Although cultural variation is sometimes as the BBS authors put it. “We will never figwill you find subjects? For generations of assumed to be superficial, Heine says that ure out human nature by studying American
psychologists, the answer has been straight- cultures differ in fundamental aspects such undergrads,” says Henrich.
forward: Use the pool of thousands of under- as reasoning styles, conceptions of the self,
Other researchers welcome this cengraduates at your university.
the importance of choice, notions of fairness, tral message but caution that the differences
But although undergrads from wealthy and even visual perception. For example, in observed in crosscultural studies may themnations are numerous and willing subjects, the Muller-Lyer illusion (see figure), most selves be problematic. “Not only do psycholopsychologists are beginning to realize that people in industrialized societies think line gists use WEIRD people, they also use weird,
they have a drawback: They
highly artificial experiments,” says
are WEIRDos. That is, they are THE MULLER-LYER ILLUSION
Nicolas Baumard, an anthropolo24
people from Western, educated,
gist at the University of Oxford in
A
Adults
industrialized, rich, and demothe United Kingdom. So the cul20
Children
cratic cultures. In a provocative
tural variation those experiments
B
16
review paper published online in
detect may simply reflect the way
Behavioral and Brain Sciences
experiments are construed by
12
(BBS) last week, anthropolovarious groups rather than deep
8
gist Joseph Henrich and psydifferences. Heine counters that
4
chologists Steven Heine and Ara
many crosscultural findings have
Norenzayan of the University
been replicated with a range of
0
of British Columbia in Canada
methods, suggesting that the difargue that WEIRDos aren’t repferences are robust.
resentative of humans as a whole
Henrich, Heine, and Norenand that psychologists routinely In the eye of the beholder. People in industrialized societies often think zayan recommend that psycholuse them to make broad, and line A is shorter than line B, but that illusion is weaker or absent in some ogists explicitly discuss whether
quite likely false, claims about small-scale societies, whose members perceive the lines as equally long.
their findings can be generalwhat drives human behavior.
ized and make data on subjects
“A lot of psychologists assume that one A is shorter than line B, though the lines are available so population effects can be more
group of humans is as good as the next for equally long. But in small-scale traditional easily detected. Researchers should also
their experiments, and that results from these societies, the illusion is much less powerful try to build links to diverse subject pools,
studies apply more broadly. We show that this or even absent.
perhaps drawing on contacts made by
assumption is wrong,” says Heine. “WEIRD
The reliance on WEIRD data has led to economists and public-health researchsubjects are some of the most psychologi- a biased picture of human psychology, says ers in non-WEIRD societies. The Internet
cally unusual people on the planet.”
Heine. Social psychologists, for example, also provides another way of reaching out,
There’s little doubt that psychologists talk of the “fundamental attribution error,” or though potentially biasing research away
have relied on WEIRDos. In a 2008 paper the tendency to explain people’s behavior in from WEIRD people toward wired people.
in American Psychologist, Jeffrey Arnett of terms of internal personality traits rather than
The accumulated data on WEIRDos may
Clark University in Worcester, Massachu- external, situational factors (attributing an still prove to have enduring value, argues culsetts, analyzed all empirical papers published instance of angry behavior to an angry tem- tural psychologist Paul Rozin of the Univerin six top-tier psychology journals between perament, for example). Yet outside WEIRD sity of Pennsylvania, as the world becomes
2003 and 2007 and found that the United societies, this error looks a lot less fundamen- more globalized. “The U.S. is in the vanStates alone provided 68% of study subjects, tal, says Henrich, as people pay more atten- guard of the global world and may provide
with a further 27% coming from the United tion to the context in which behavior occurs, a glimpse into the future,” he says. For now,
Kingdom, Canada, Australia, New Zealand, so someone’s anger might be construed as however, psychologists should remember
or Europe. Psychology undergraduates were simply reflecting an irritating day.
that WEIRDos remain weird.
the sole subjects in 67% of U.S. studies and
Textbooks also frequently describe peo–DAN JONES
80% of studies in other countries. Overall, ple as valuing a wide range of options when Dan Jones is a freelance writer in Brighton, U.K.
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Perceived difference in lines A and B (%)
www.sciencemag.org SCIENCE VOL 328
Published by AAAS
25 JUNE 2010
Downloaded from http://science.sciencemag.org/ on June 23, 2017
CREDIT: (ADAPTED FROM) M. SEGALL, ET AL., THE INFLUENCE OF CULTURE ON VISUAL PERCEPTION, THE BOBBS-MERRILL COMPANY (1966)
A WEIRD View of Human Nature
Skews Psychologists’ Studies
1627
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