Why are most people right-handed?
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Right-handers on the planet has always been more than a left-handed
Did you Know that approximately 85% of the world population are right-handed and only the remaining 15% left-handed? The preference to use a particular hand to perform the daily tasks most often due to some peculiarities in the brain. So what else distinguishes righties from lefties, and from what is related to the fact that left-handed people in nature is always less than?
How did the lefties?
All the vital systems of the human body are linked. This statement becomes more true when studying the structure . As you know, the right hemisphere is responsible for spatial orientation, while the left manifests itself more creative, mainly by controlling our language skills. In addition, the nerves in the brain cross within us so that the result is an interesting effect: the left hemisphere controls the right side of the body and the right hemisphere — for the left. Such an unusual building came to us because the end result of thought processes often depended on the ability of our brain to multi-tasking. In order to provide the best for the survival of man in nature, took care to bestow us with not one brain, but two, each of which could be able to perform different from other work.
Found in the Parking lot in Kenya stone tools have shown that about 600 thousand years ago our ancestors were almost entirely right-handed. The emergence of left-handers could be due to the development of speech in ancient man, when the left hemisphere is responsible for the human ability for languages, the beginning of active development. According to this theory, the dominant use of the left hand could appear as a side effect. To prove this theory is almost impossible, so scientists still have a couple of interesting hypotheses.
Scientists believe that the probability of having a child are left-handed greatly increased in the presence of the mother's body large amount . So, testosterone has a strong influence on the structure of the brain of the unborn child, forming a relatively greater development of the right hemisphere. Researchers believe that left-handers are more likely to suffer from infectious disease compared to right-handed for the same reason.
Interesting fact: left-handers and right-handers among chimpanzees always equally
In Addition to the innate left-handedness, there is also purchased. Universally known that children often copy the behavior of their parents that often affects the ability to use right or left dominant hand.
In any case, despite the fact that righties and lefties are different from each other in terms of the use of one or the other hand, this difference does not affect their mental or physical abilities. Moreover, such a small detail could become a kind of evolutionary advantage in the survival of ancient man, a loose use of the left hand could well give the left-handed advantage in combat with a potential enemy because of its effect of surprise.
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