Please go back for a moment to my last
week’s blog and look at the picture of the Müller-Lyer Illusion. The weird
thing of this figure is – and that’s why we call it an illusion – that the
upper line looks shorter than the line under, though actually the lines have
the same length. Or don’t you see the illusionary difference of length of the
lines? If so, probably then you are not weird, or rather you are not WEIRD, for
especially people from Western, Educated, Industrialized, Rich and Democratic
societies are tricked by the figure. In other words, whether you see the
illusion or don’t is culture dependent. This is not only so for this illusion
but for other illusions as well. But let me here concentrate on the Müller-Lyer
Illusion as an instance of all illusions.
This illusion has been first described in
1889 by Franz Müller-Lyer. Since then several psychological explanations have
been proposed. However, all tests of the illusion have been done by investigators
with a Western background and almost everybody who has seen the illusion has this
background as well. Therefore, it wasn’t realized that the illusion might be a
WEIRD phenomenon. This changed in the 1960s when it was realized that seeing
the illusion might have been influenced by cultural experiences. So Marshall H.
Segall, Donald T. Campbell and Melville J. Herkovits got the idea that people
living in different kinds of environments may see the illusion in different
ways. To test this idea they selected peoples living in different physical environments,
varying from environments with mainly straight lines like big cities with sky
scrapers to environments with chiefly winding and varying lines like you find
them in wood areas. Teams of data-collectors were sent to peoples in 15
different environments who were asked to estimate the length of the lines in the
Müller-Lyer Illusion; or rather they had to judge the difference in length. In
their summary of the project the investigators don’t specify the peoples
involved but – to give an idea – you have to think of inhabitants of New York
as opposed to Kalahari hunter-gatherers, Suku tribespeople from Northern
Angola, and Bete tribespeople from the Ivory Coast. Care was taken that the test
persons were not influenced by the data-collectors and, as said, the test had
been developed that way that the informants could indicate what according to
them the difference in length of the lines in the pair was, in case they saw a
difference. (Actually, they had to judge not only the Müller-Lyer Illusion but
four other illusions as well.) And what happened? The illusion appeared to be
an illusion. Or rather some saw differences in length between the lines, but
the differences were different for different peoples; in addition the
differences were zero for some. Moreover, to what extent people were
susceptible to the Müller-Lyer Illusion was dependent on the environment where
they lived. People from Western societies – societies characterized by straight
lines – proved to be more susceptible to the Müller-Lyer Illusion than
non-Western peoples, i.e. for the former the difference in length was more than
for non-Westerners. Also among the latter for some the difference in length of
the lines was more, for others less, dependent on the environment where they
lived. In other words, seeing the illusion or to what extent you see it depends
on the culture where you live. In an older blog (dated 22 June 2009) we have
seen that whether a certain epistemic intuition is really an intuition for you
depends on your social-economic background. Here we have an example of the fact
that illusions are culture dependent. Often it is so that mental and visual
perceptions are related to cultural differences. And if you are weird you see
illusions where others maybe don’t. But since the whole world still becomes
more westernized to some degree, it’s not unlikely that in future more and more
people will become weird.
References
and related websites
- Barthelme,
Simon, “Culture and Perception, part II: The Muller-Lyer illusion”: http://cognitionandculture.net/blog/simons-blog/culture-and-perception-part-ii-the-muller-lyer-illusion
-
Donaldson, J; F. Macpherson, “Müller-Lyer” (Some explanations of the Müller-Lyer
Illusion): https://www.illusionsindex.org/ir/mueller-lyer
- Schulz, Colin, “Are Optical Illusions Cultural? People from around the world respond to
optical illusions different. But why?”: https://www.smithsonianmag.com/smart-news/are-optical-illusions-cultural-6633978/
- Segall, Marshall H.; Donald T. Campbell;
Melville J. Herkovits on their research: https://pdfs.semanticscholar.org/7f19/97864b14ec48d827fc24c41701be6bca5833.pdf
- Wade, Lisa, “Cultural differences in cognitive
perception” (Some statistics of the research by Segall et. al.): https://thesocietypages.org/socimages/2011/12/26/cultural-differences-in-cognitive-perception/
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