One out every ten people worldwide is left-handed. That means around 10% of the population has a trait called left-handedness. It has recently been discovered that there are certain genes that are linked to this phenomenon. It has been recently proven that round four genetic markers are different in left-handers. These genetic difference has also shown a difference in brain structure.
Left-handed people have better verbal skills than right-handed people. This is due to different brain structures. Like twins, DNA has a huge part to play in the left-handedness. Genes inherited from parents determine whether you are going to be left or right-handed.
Previously it was unknown what genetic regions are involved in this. But a recent study involving 400,000 sets of DNA has shown that there are four regions involved.
Three out of the four regions are responsible for brain structure. And also the protein development in the brain. These three markers are connected to the cytoskeleton or a part of the cell called “scaffolding”. The main function of the cytoskeleton is to determine the structure of the cells. They also control cell movement within the body. The cytoskeleton determines the left-right symmetry in animals as well.
It is also responsible for the formation of the white matter inside the brain. The white matter is accountable for verbal and oral skills. They are long nerve fibers. The main difference is in between the placement of these nerves. They impact the language related components of the brain. This might be the reason why left-handed people are better verbal communicators than right-handed people. Hence they have an advantage over the right-handed people with verbal tasks.
The scientist also pointed towards another important thing. Which is the relation of left-handedness with Parkinson’s disease. Studies have shown that left-handed people are more prone to schizophrenia. Also, they are less likely to get Parkinson’s disease. However, it is not confirmed and is only a speculation.
All this research is carried out on the population of London only. According to the research, only 25% of left-handedness is due to genetics. 75% still depends on the environment. That said, there is room for a lot more research on this topic!