In the spirit of full disclosure, I’m a righty. As a kid, I wished I was a lefty; that group always seemed to be a more artistic, independent bunch with stylish handwriting. Despite my attempts to retrain my hands and make the left my go-to side (writing my spelling sentences took so much longer), I soon learned that what you’re born with is pretty much what you’ve got when it comes to your dominant hand.
According to LuckyLefty.com, approximately 10 percent of people are left-handed, a number that transcends all cultures. Today there are entire social networking sites dedicated to left-handers, but is there really a difference between the lefty minority and the righty majority?
Choosing Sides
Were those leftys really more artistic and independent, or was I just having an adolescent identity crisis? According to M.K. Holder, a researcher at Indiana University, even though “handedness” has been studied for over 160 years, we still can’t precisely describe what causes us to use one hand over the other, and why human populations are largely predisposed toward right-hand use.
There’s evidence that genetics determine our side preference, but scientists can’t agree on the exact process that this entails because social and cultural mechanisms have also been shown to influence our handedness. Case in point: my grandfather was a born lefty whose teachers forced him to use his right hand. More restrictive societies show less left-handedness, and clearly that’s a result of such nurture over nature. Things get further complicated because side preference technically goes beyond hands and allows some people to classify themselves as ambidextrous. (You know, kick with your left foot, write with your right hand.) Some activities, like holding our dogs’ leashes, carrying luggage, and lifting the lid off a box, aren’t strongly linked to our side preference—meaning we’ll often switch sides without thinking about it during these acts. We’re more likely to perform other activities with our favored side, like throwing a ball, hammering, hitting a tennis ball, and, obviously, writing.
Here’s another interesting fact: less than 50 percent of adults always use the same hand while stirring with a spoon, but more than 80 percent stick to their preferred hand while eating with a spoon. How do you explain that? Modern handedness studies show that hand-specific activities are the ones requiring either a lot of practice and attention to detail, like writing, or the synchronization of muscle groups in an action like throwing a ball.
