“Are you a lefty?” is a great conversation starter that makes it easy for the left-handed person to feel at ease amidst unknown people. The world is not in short of assumptions regarding any matter and when it comes to this too, we are of the thought process that left-handed people are more intelligent, more smart, artistic, more competitive and out-of-the-box thinkers. Everything except one—out-of-the-box thinking-remains true and a conflicting study of more than 1,000 people proved this to be wrong as not one dominant side of the brain but both sides are involved in creativity. But, the very fact that only 10% of the total population is left-handed which makes them very special and unique indeed! All of us have special talents that pertain to our genes and wiring of the brain and we use one side of the brain more than the other. Left-handed people are right-brained which clearly implies that they are better at communication and verbal skills, analytical skills and have a command over language which makes them excel at leadership roles, discipline and self-control. To find out whether you are a left- or right-brained person please visit the website www.firsteatright.com.
There aren’t many around us who are left-handed as its 1 of every 10 people who possess this trait. When we look into the science behind this, it is seen that genes have a partial role in determining handedness and this has been verified by a study of twins that shows that 25% of the variation in handedness can be attributed to genes besides other factors such as chance and environment too playing a critical role. It shouldn’t be a surprise if you come to realize that there are quite a few people in your family tree who are lefties too! Scientists have been under the impression that it was a single gene which contributed to this attribute but studies tell us that it might be up to 40 of them that can contribute to this trait. Still, there has not been clues regarding which of the genes hold responsibility for the trait in the population. A new study conducted by scientists from the University of Oxford that was published in the Journal Brain is the first to identify which genetic variant separate the lefties from the righties. Writing Down the Gene The research team identified genetic variants linked to left-handedness by analysing the genome of about 4,00,000 people from the UK Biobank in which 38,332 of them were left-handers. The researchers were able to isolate four genetic regions associated with left-handedness of which three of them were linked to proteins that play a dominant role in moulding brain structure and development. All the proteins were connected to microtubules, a component of cell ‘scaffolding’ or the cytoskeleton. Its cytoskeleton that has a strong impact on left-right symmetry in other species and in humans, it helps in determining the structure of cells as well as the way in which they operate within the body. The team focused on 10,000 participants and found that it was the same genetic variants linked with left-handedness that was also linked to differences in the brain’s white matter tracts. It has been shown that the language areas of both sides of brain communicate in a more coordinated way which brings us to the important fact whether left-handers are the best verbal communicators. But we have also been able to see that handedness-associated cytoskeletal differences are visible to the brain. Such impact was seen in animals such as frog and snails that the effects are caused by early genetically-guided events and this even makes it possible for future development of handedness to start appearing in the brain in the womb. While this is a great beginning the study has found only the first 1% of the genetic component that too, only in the British population. We need a lot many other studies to come to conclusions as to how people ultimately become left- or right-handed. Comments are closed.
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