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Left - handed people make up only around10%of the global population , but a quick glimpse unwrap that many key proposer and shakers are lefties .
For instance , three out of the last six American presidents were lefties : George H.W. Bush , Bill Clinton and Barack Obama . Plus , an eclectic deal of outliers who ’ve rock the reality in one way of life or another had rife left hands : Michelangelo , Leonardo da Vinci , Paul McCartney , David Bowie , Jimi Hendrix , James Baldwin , Nikola Tesla , Oprah Winfrey , Bill Gates and Steve Jobs , according to a2019 reportandThe New York Times .
Does this southpaw painter have an cognitive edge?
It ’s an telling roster , but what does the data say ? Are pass on - handed people smart than righties ?
Related : Why are multitude left- ( or right- ) handed ?
To investigate this question , researchers looked at the differences in mathematical achievement between more than 2,300 right- and left - handed scholarly person between the ages of 6 and 17 in Italy . While there was no dispute when looking at the easiermathproblems , left - handed students had a important edge on the more difficult problems , such as associating a numerical function to a set of data , according to the 2017 sketch in the journalFrontiers , guide by Giovanni Sala , an assistant professor at the Institute for Comprehensive Medical Science at Fujita Health University in Japan .
Does this southpaw painter have an cognitive edge?
But why would a person ’s dominant hand have anything to do with numerical ability ? Left - handedness is assort with some surprising differences in the architecture of the brain . A 1995 meta - psychoanalysis of 43 bailiwick in the journalPsychobiologydetermined that left - handers have a significantly larger corpus callosum — the bundle of mettle fibers connecting the two hemispheres of the brain — than right wing - handers do .
" A opening is that the stronger connection between the two hemisphere earmark the [ left - handed ] open to have stronger spacial power , and we fuck that spacial power are connect to mathematics because math is often conceptualized throughout space , " said Sala , who bear his research while at the University of Liverpool in the U.K.
In some causa , it might calculate on how a person becomes leave - handed . " Handedness is a very complex trait , and specifically leave - handedness may be an advantage or a disadvantage depending on what the cause is , " Sala told Live Science . Sometimes , " left - laterality can be due to some kind ofbraindamage , when the right hemisphere has to take over because there is some form of damage in the left hemisphere . "
This case of damage could be because of a hemispheric wound that come prenatally , according to a 1985 report in the journalBrain and Cognition . If the lesion pass off in the left over hemisphere of the brain , then this could lead the individual to predominantly apply the right half of their genius . Since the cerebral hemisphere of the brain are cross - indexed ( meaning the unexpended hemisphere controls the right side of the eubstance , and vice versa ) , a dominant correct hemisphere can lead to remaining - laterality . The written report refer to this as " pathological depart - handedness , " and note that it can lead to learning difficulties . In other words , sometimes being lefty is assort with acquire problem .
It ’s complex , but Sala ’s study paints a picture of unexpended - handers being over - comprise at both the bottom and top of the cognitive spectrum . " Once you see that the subject is not intellectually take exception … then pull up stakes laterality seems to be a predictor of rational power , " specifically mathematical ability , according to his subject field , Sala said . However , he cautions that his results are not the last Good Book , and that further study must be done .
What ’s more , other data shows that righties have a slight intellectual edge over lefties . A 2017 study in the journalNeuroscience and Behavioral Reviewsreviewed 18 other studies which included data from over 20,400 multitude and found that rightfield - handers had negligibly higher IQs than left - handers do , on intermediate . " The panel is still out when it come in to the questions of whether it is grade of deal preference that is associated with intelligence and whether there is a human relationship between relative handskill and intelligence , " the authors wrote in the study .
Lefty history
Left - handedness has not always been seen in such a positive light . In the 1936 pamphlet " The Prevention and Correction of Left - Handedness in Children , " by J.W. Conway , left - handedness was described as a " disease " as serious and problematic as rickets andpneumonia .
Prejudice against left - handers has deep radical and is build up into our very language . To be someone ’s " proper - manus human race " is good , while make " two left-hand feet " or receiving a " left - handed compliment " is uncollectible . The word itself comes from the old English " lyft " have in mind weak or broken , while the word " right " is throw the extra honors of mean factually correct , morally justified , or a " moral or sound entitlement . "
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These slight are not unique to English , either . The Gallic word for left is " gauche , " which in both English and French also mean " awkward or untactful , " while , " droite , " the French word for right , translates to " adroit . " Going back further still , the popish word for left was " sinister , " while their word for right , or " dexter , " gives us the English word dexterity .
Even modern research acknowledges some downsides to being of the lefty persuasion . It ’s been statistically associate withschizophrenia , dyslexia , andbreast cancer , to name a few . ( However , an tie-up does not rise that one causes the other . )
But these bias just make those legion leftfield - handers who have become diachronic and modern-day image all the more telling . Not spoiled for a chemical group of guess gauche and forbidding abnormals , correct ?
primitively published on Live Science .
