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Left/Write
Left/Write A loosely scientific tour of handedness. About 90% of the world's population is right-handed. About 10% of the wortd's population is not. Asia A Africa 11% 9% 9% 8% 8% Why isn't handedness split 50/50? What makes a person right- or left-handed? Human evolution favors cooperation over competition, according to Northwestern University research. No one knows for sure, but researchers believe that brain asymmetry and genetics are involved. Right-handed people generally turn out to perform language activities on the left side of the brain: We live in a right-handed world, which promotes same-handedness and, by extension, better cooperation. While some left-handers display right-brain language dominance, many more perform language activity across both hemispheres: But humans can also be competitive, so a unique, minority characteristic such as left-handedness can be advantageous. Some researchers believe that left-handedness is an inherited trait. Lefties have rights too: Left-handed bias has been a global phenomenon for centuries "lyft" Anglo-saxon weak, broken "gauche" French clumsy "siniestra"/"sinistra" Spanish/Italian sinister, evil US classrooms no longer force left-handed students to switch hands. Recent surveys in Asia, however, find that the practice still exists. In 2007, nearly 60% of Taiwanese left-handers studied had undergone switching. In Japan, only 0.7% of students studied were left-handed. Other studies link forced conversions to stuttering, speech impediments, dyslexia and other learning disorders. Right-handed desks Spiral notebooks Some of the WORST THINGS about living in a right-handed world Lead/ink smearing Bad hand posture Sources: http://www.ucl.ac.uk/medical-education/reprints/1993Seddon_McManus-UnpublishedMetaAnalysis --MinorCorrectionsFeb2005.pdf http://theweek.com/article/index/227350/why-so-few-people-are-left-handed http://www.nytimes.com/2011/03/08/health/views/08klass.html?_r=3& http://en.wikipedia.org/wiki/Bias_against_left-handed_people South America North America ustralasia/Pacific Europe "left" also means
shared by katieartzner on Jan 29
Left/Write: A loosely scientific tour of handedness - created January 2013
Katie Artzner
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