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Scientists Can Tell if Babies Will Be Left-Handed Before They're Even Born

From TIME - December 5, 2017

Whether people write with their right hand or their left hand is determined during pregnancy, scientists said in new research, evidence that could help put to bed the question of whether people are born with a favored hand or develop one later.

The studyled by Valentina Parma, a researcher at the International School for Advanced Studies of Trieste, Italy, and Professor Umberto Castiello of the University of Padua in Italyfound that hand preference is already well defined at the 18th week of gestation.

The researchers said their discovery might help predict depression, schizophrenia and autism spectrum disorders, because hand preference is dictated by the dominance of one of the brains hemispheres over the other. The conditions that they expect to be able to predict are also associated with similar cerebral asymmetry.

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