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Why There Are Less Left-Handed People Than Right-Handed People?


Our hands, how helpful they are! Hands let us pick things, punch someone, masturbate, write, touch the flowers in our gardens, and help us to do a lot more other things. But there is something odd, we have two hands and we don’t use them equally often, instead we prefer using one hand more over the other. Why is it so?




In this blog today, I am going to break down all the crazy science behind the way you use your hands and in between the different sections of this article you will find a few fun facts about the right and the left handed people. So here you have FUN FACT NUMBER 1:

Tom Cruise, Paul McCartney, Oprah Winfrey, Justin Bieber, Jennifer Lawrence, Brad Pitt, and Angelina Jolie all have dominant left hands. Many deceased celebrities, like Marilyn Monroe, Kurt Cobain, and Jimi Hendrix were left-handed too. FOLLOW THIS LINK TO CHECK THE LIST OF TOP 50 LEFT-HANDED CELEBRITIES.

So the first question that may come to your mind is: Why don’t we use both of our hands equally? Let’s explore the science to answer this wicked question.


Why You don’t Use both of Your Hands Equally?


Actually, you do use your hands equally but only in the early years of your life, when your brain was still developing. But as you grow through your life you start favouring the use of one hand over the other. Being a right-handed human is not a big deal as about the 90% of the population uses their right hand often, being a left handed human is rare and in fact only about one tenth of the human population is left handed; being able to use both the right and the left hand is extremely rare, as only a less than one percent of human population is Ambidexter.

So here’s the reason why we do not use both of our hands equally.

The motor action of the left and right sides of the human body are controlled by the opposite hemispheres of the brain. Our body looks symmetrical from the outside and it is(almost) even from the inside, but it isn’t same for the left and right halves of the brain, as they are not equal in their control of different types of behaviour, which creates the dominance of one hand over the other for certain tasks. The supremacy of one hemisphere over the other for certain tasks and behaviours is termed as cerebral lateralization.


Here's a video that describes Lateralisation of

brain function at its best.




So the reason is simple, we do not use both of our hands equally because the two sides of our body are controlled by two entirely similar yet different halves of brain.



FUN FACT 2:

Scientists have also found an increased risk for dyslexia, ADHD, and certain mood disorders in left-handed people, according to a 2010 study published in Pediatrics. FOLLOW THIS LINK TO KNOW MORE ABOUT THE HEALTH RISKS ASSOCIATED WITH LEFT-HANDEDNESS.

Now the bigger question is, why the majority of people are right-handed, why most of you cannot write your name using your left hand? Why? Let’s explore why…..


Why are most of us right-handed?

Left handed people have always been existed on the minority section of the world. In fact, “a human population in which left-handed individuals predominate has never existed”, according to archaeologist Natalie Uomini at the University of Liverpool in the UK.

One theory which unwraps the reason the behind the question that we are discussing here is that maybe it is possible (though disputable) that as our Hominin ancestors started walking on two legs instead four, they got their hands free to perform new more productive tasks that contributed to the evolution of humanity like making tools, paintings, huts etc. In this way maybe they were predisposed to begin using those hands differently.



We know this change occurred from experiments in which the researchers created their own versions of ancient age stone tools using either their right or the left hands to chip, knap or grind – the tool into shape, before comparing these tools made by our early Hominin ancestors. This experiment suggested that there is only a limited evidence that Hominin toolmakers working more than 2 million years ago were primarily right-handed.


However, the stone tools that were found in Koobi Fora, Kenya, built some 1.5 million years ago by two ancient human species – Homo habilis and Homo erectus – do show some evidence that these species were primarly right handed. And as humanity went forward in time a species called Homo heidelbergensis had appeared, perhaps around 600,000 years ago, even that specie depicted that there was a clear right-handed preference in prehistoric societies. Wear on the preserved teeth of Homo Heidelbergensis, a specie that lived about 800,000 to 1 million years ago in Europe, for instance, suggest that food was usually brought into the mouth with the right hand.




FUN FACT 3 In the past, left-handedness was seen as a mark of the devil, a sign of neurosis, rebellion, and criminal activities. In fact, the word 'left' in English comes from the Anglo-Saxon word 'lyft', meaning broken or weak.

According to the Homo loquens hypothesis,

Lateralisation in general was driven by the evolution of an upright, bipedal stance, while the rightward preference was driven, some time later, by the evolution of language.

In general words researches believe that it all comes down to language, the reason why the majority is right handed. Most of the linguistic processing occurs in the left hemisphere, which also controls the right side of the human body. So as our ancestors moved forward into the history, they became more vocally active, created complex languages to communicate better, and this change continued to occur forever, even till now.


These complex changes in your ancestor’s language caused the left hemisphere of the brain to evolve faster and to become more complex so as to compete with the evolving world. Due to this the preference for the right hand may have intensified simply as a side effect.

So Right-handedness can be just an accidental phenomenon, a by-product of how your brain is wired up. But proving this hypothesis is difficult, maybe impossible.


Here's a video which describes language, its origin and evolution over the time.



This is still a very basic explanation and it fails to decode a complex phenomenon like HANDEDNESS. Even according to BBC,

Proving this hypothesis is difficult, or even impossible, since it would ideally involve running neurological tests on our long-dead ancestors. The truth is we'll probably never quite know what the sequence of events was that led our species to lean so overwhelmingly on the right sides of our bodies and the left sides of our brains.

So the question with which we started has the answers but with no evidence.Dwell upon this topic on the internet create your own theory and feel the waves of knowledge splash your brain(both the right and the left hemispheres, Lol).


-Harsh Singh

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