It was once conceive that leave behind - handedness was a curse and that all lefties had been marked out by the daimon to do his command on Earth . luckily , we now have actual scientific discipline , allowing a team of investigator to place the genes associated withleft - laterality . As it turns out , these genes are also strongly implicate with structure the brain , and are even tie in with weather condition like schizophrenic psychosis and dementedness .
Writing in the journalBrain , the sketch authors explain that previous research has shown that superposable twins are more likely to expose thesame handednessthan non - selfsame twins , suggesting that handedness is mostly genetic .
To try to distinguish the specific cistron involved , the researchers examine the genome of nearly 400,000 hoi polloi in the UK , 38,332 of whom were left - handed .
Analysis register that four distinguishable genic realm appear to be mostly responsible for left - handedness , and that three of these also code for the formation of protein that make up the scaffolding – or cytoskeleton – of brain cells .
Compared to rightfulness - handers , therefore , leftiestend to exhibit differences in the body structure of certain nous regions , particularly those that divvy up with language .
Commenting on this determination , survey conscientious objector - author Akira Wibergexplainedthat " in left - handed participant , the language sphere of the left and right sides of the wit communicate with each other in a more unified way . This stir the intriguing possibility for future research that left - handers might have an reward when it comes to perform verbal labor , but it must be think of that these differences were only fancy as averages over very large number of people and not all left - handers will be similar . "
When looking closer at the genes involved , it appear that they all also have a hand in psychiatrical disorderliness and cognitive decline . For instance , the gene that is most strongly connected to odd - handedness – yell rs199512 – is also known to play a theatrical role inParkinson ’s diseaseand certain genial health trait such as neuroticism .
On top of that , the communication tracts that organize language in the mastermind have systematically been shown to be associated withschizophreniaand auditive hallucination .
However , the researcher also point out that these genes only cause genial wellness problems in a tiny number of people , so being a leftie should not be considered a major peril factor for any of these shape . Realistically , the only thing that left - handers really have to concern about is smudging their handwriting .
And for anyone hang on to medieval superstition , this research should put an destruction to any awe regarding a Satanic odd - handed army .
