Only 10 percent of the human species is left-handed. Moreover, the New York Times recently reported that the size of the southpaw population has held constant ever since hunter-gatherer days (ancient handed-ness data come from studies of cave paintings and spears). This relative rarity of being left-handed (steady 10 PERCENT over CENTURIES) has mystified scientists and led to a series of specious assumptions about southpaws, such as linkages to schizophrenia, criminality and dyslexia. At the same time, reports on left-handedness also mention that a majority of recent U.S. presidents — including Obama — are left-handed. Turns out, left-handed females are a much rarer breed than left-handed males. A meta analysis of 144 studies including more than 1.7 million total participants found a “significant and robust” gender correlation with handedness. According to the 2008 study, men have 1.23 times the odds of being left-handed, compared to women’s chances.
Posted on: Tue, 15 Jul 2014 16:16:01 +0000
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