Photo from open sources
Scientists still don’t know exactly why some people are born with such an “anomaly” as left-handedness. Various theories appearing on this account, contradict each other, and that’s just refute previously accepted explanations.
For example, the theory of the origin of left-handed people was the most tenacious, advanced by the french surgeon in the sixties of the 19th century Paul Brock, who linked this to the work of the cerebral hemispheres. Moreover such a connection, the scientist proved, is cross-linked. Usually in humans the left hemisphere is more developed, there are so many right-handed people, but it happens and vice versa, why left-handed people appear.
However, later studies, for example, the second half last century, refuted this claim, since it was proved that lefties basically have the same left hemisphere orientation, like righties. That is, the left hemisphere, responding, supposedly in contrast from the “logical” right, for the imagery of thinking (also quite controversial statement) may equally well be or poorly developed in both righties and lefties.
Modern geneticists are also trying to contribute to explanation of this phenomenon. So, scientists at the universities of Bristol, Oxford, St Andrews, Max Planck Research Institute (Nijmegen, Holland) established a connection in the dominance of the right or left hand with a certain group of genes and, in particular, all more this phenomenon, which is still in the embryo, is supposedly influenced by the gene PCSK6.
However, they did not find out the main thing: if such an orientation depends from the number of gene mutations, why left-handedness is nowhere disappears from the genetic piggy bank, and is persistently transmitted from generation to generation.
Most progressive researchers stick today opinions that left-handedness is a more “subtle” sign, somehow related to the spiritual development of a person, the experience of his past lives, not with his body. That is, an unambiguous explanation for this phenomenon not found so far …
