Looks like the left hand has the upper hand after all. In a study published in the British Journal of Cancer, researchers found that left-handers had a higher risk of breast cancer than right-handers, especially for cancer that occurred after menopause. Your noggin is divided into two halves: And that rule also extends to any right-handers who happen to enter the leftie zone. Over the years, the percentage of people who are left-handed has continued to rise. Compared to righties, left-handed participants in the study showed an imbalance in activity between the left and right hemispheres when trying to process their moodiness. For women, however, handedness made no difference. University of Kansas researchers recently determined the handedness of ancient humans by studying — oddly enough — their teeth. After birth, they stick to their more dominant hand.
In fact, some researchers believe that when it comes to survival of the fittest, lefties come out on top. The study also found that car accidents were often to blame, so lefties also took on the reputation for being bad drivers. In a fight, a left-hander would have the advantage in a right-handed world. McDonnell Foundation supported this research. It doesn't mean you're artsy Southpaws also have a reputation for being introverted and artsy, says Grimshaw. He also found that left-handers were more likely to not attend or to drop out of college, and to work in less cognitively demanding jobs, like manual labor. Your noggin is divided into two halves: Abrams and Panaggio turned to the world of sports for data to support their balance of cooperation and competition theory. Stories about being slapped on the wrist for being a lefty aside, there must be some deeper, evolutionary reason, scientists figure. A new study suggests lefties are rare because of the balance between cooperation and competition in human evolution. And we certainly shouldn't worry about lefties' chances of success: Panaggio—both right-handers—are the first to use real-world data from competitive sports to test and confirm the hypothesis that social behavior is related to population-level handedness. In the world, about 10 percent of individuals are left-handed. After all as of , five of our last seven U. There are plenty of theories on what else might determine which hand you write with, but many experts believe that it's kind of random, says Yeo. Ambidexterity can be learned even though people tend to prefer using their more dominant hand to perform tasks. In one-on-one combat, using the left-hand is like throwing a curveball. By locating the wear and tear on those prehistoric chompers, scientists were able to determine whether our prehistoric ancestors were using their left hand or right hand more dominantly "All you need to have is a single tooth, and you can tell if our assumptions are right — if the individual is right- or left-handed," study researcher David Frayer, Ph. Compared to righties, left-handed participants in the study showed an imbalance in activity between the left and right hemispheres when trying to process their moodiness. They developed a mathematical model that shows the low percentage of lefties is a result of the balance between cooperation and competition in human evolution. Left-handed individuals are in the minority. And that rule also extends to any right-handers who happen to enter the leftie zone. For those with mood disorders such as depression or bipolar disorder , the rate of left-handedness was close to average, at 11 percent. Division of labor is a common theory explaining the emergence of left-handedness. But aside from making it tough to cut a straight line with a pair of scissors designed for righties, being a southpaw can also have some subtle effects on our physical and mental health. Factors That Cause Left-handedness Several theories explain the development of left-handedness in humans. Physical competition, on the other hand, favors the unusual.
Video about lefty percentage:
Study Shows Left-Handed People More Likely to Be Schizophrenic
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