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The benefits of being left-handed, according to science

15/01/2020

The benefits of being left-handed, according to science

A new study has found that the brains of people who use the left hand can be associated with several hidden talents

A. López

09/10/2019

You have always known that you were not the same as others. At school, they sure asked you more than once how it was possible for you to write with the left and tried to imitate that achievement that left them so stunned. In many countries of the world they have been discriminated against for the simple fact of not using the right hand and even some have taken a family rebuke for not doing things like others.

Being left-handed has a genetic component and, according to statistics, about 13% of the world's population (13% of men and 9% of women) has this capacity, which responds to a brain reason determined by the dominant hemisphere of each person, which curiously is inverse. That is, if your dominant side is the right one, that person will use the left part of his body better and vice versa

And although we have never been clear why some have this trait, research published by the magazine 'Life' ensures that it is the spinal cord that determines it. According to the study directors, the gene activity in this area is asymmetric already in the uterus, and the preference for the right or left hand can be traced to that asymmetry.

Master in some fields

In addition, this is a situation that occurs in a hereditary way: if you are left-handed you have a chance that your offspring will be too. And although approximately 25% is due to genetics, the other 75% implies environmental factors, some difficult to analyze for now. Do you have a lot of left hand? Science confirms that you have better verbal skills and will have less risk of Parkinson's.

An investigation with 1.2 million people confirmed that left-handed people are less likely to have arthritis and ulcers

This is confirmed by a study, published in the journal 'Brain', which has used thousands of brain scanners and hundreds of sequenced genomes and has sought associations between the brain and hands. The researchers found that left-handed people have the most connected hemispheres, which leads to a stronger bond in regions associated with language, related to greater linguistic ability. And not only this: according to research from the University of Toledo, Ohio, they may be better for remembering events.

They also found a "significant positive correlation" between left-handers and mental health: more sensitive and worried. This brain wiring also marks the difference in the field of mathematics. Although there is no difference with those skilled in simple operations, those who use their left hand are better at solving more complex problems.

Best in sports

Previous studies have found that there is a majority of left-handers in professional and interactive sports and a 2017 investigation states that if you have a child with this ability, you should encourage him to play table tennis, baseball and cricket and thus maximize his chances of success. In addition, another publication by the University of Manchester says that such people win more fights in boxing and martial arts, which confirmed the "fighter hypothesis": that despite the 'evolution', the trait has survived due to a competitive advantage in combat.

They get less sick

In 2015, research published in the 'Journal of Economic Perspectives' showed that, on average, left-handed people tend to recover from strokes and other injuries faster than right-handed people. The reason? It has to do with the ventral care network of a person who uses the right hand.

Science confirms that if you use your left hand you have better verbal skills and you will have less risk of suffering from Parkinson's

As these types of diseases tend to affect one side of the brain, a victim who suffers one of these accidents on the right side is prey to lose their entire ventral care network, while a left-handed person only loses a part of it. And that is significant, because this area is involved in attention and spatial awareness, particularly important in terms of recovery from these types of conditions, when the organ must reorganize and begin healing.

A 2001 investigation conducted with 1.2 million people confirmed that left-handers are less likely to have arthritis and ulcers, although the study authors could not identify why this happens. But not everything is a path of roses. Several samples have shown that those who use their left hand are more likely to suffer from breast cancer, post-traumatic stress disorder, lack of sleep and psychotic diseases such as schizophrenia.

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