Why are some people left-handed? It has to do with these brain differences, writes ocklenBLOG
Left-handers show a rightward shift in brain asymmetry.
Several genes associated with left-handedness were also associated with asymmetries in brain structure. Early left-right axis determination processes in the brain link left-handedness and asymmetries in brain structure.About 10.6% of people are left-handed but what causes left-handedness is still not well understood. One thing that is clear is that handedness is not caused by the hands. It is completely impossible to tell whether a person is left-handed or right-handed just by looking at their hands.
A new study, now uploaded on the preprint server bioRxiv, focused on answering this question by looking both at brain structural differences between left-handers and right-handers and the genetic link between handedness and brain structure . In the study, the researchers analyzed brain imaging data from 28,802 right-handers and 3,062 left-handers that were obtained from the UK Biobank.
In the study, the researchers analyzed asymmetries in brain structure across the whole brain for their dataset, as well as genetic variation linked to handedness and brain structure and the overlap between the two.The researchers found out the left-handers showed a rightward shift in structural hemispheric asymmetries in cortical surface area for eight brain areas and a rightward shift in structural hemispheric asymmetries in cortical thickness in two brain areas.
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