Maybe it’s time to let the data do the talking. In order to find out if left-handed people were actually smarter than the rest of the population, researchers studied the mathematical achievements of right- and left-handed students in Italy. Left-handed students had a significant edge on the more difficult math problems compared to the right-handed students.
According to a meta-analysis of 43 studies, left-handed people have a larger corpus callosum. This is the bundle of nerve fibers that connect the two hemispheres of the brain. A stronger connection between the two hemispheres allows left-handers to have stronger spatial abilities, which are linked to mathematics.
To learn more about the possible explanations as to how left-handed people are smarter, check Live Science’s full piece here.
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I think left handed people are more challenged in everyday situations and therefore have to solve more handedness problems.. and more experience in solving problems may be considerd as higher intelligence.
But i have no proove, but even as it sounds plausible to me, i might be wrong.