About 10% of people are left-handed, but what makes them so? Scientists have recently made some headway in answering this question. They found several genetic regions linked to brain development that are associated with handedness, as well as certain differences in brain structure between righties and lefties.
It’s already been established that whether we’re right- or left-handed depends to some extent – around 25 percent – on the genetic code we’re born with, but until now scientists hadn’t been able to identify the specific areas on the genome responsible.
This new study of around 400,000 individual records in a national UK database goes a long way to doing just that: it found four genetic regions associated with handedness, and three of those were linked to proteins involved in the brain’s structure and development.