Close to 90% of Neandethals were
right-handed. Much of this data comes from comparing the muscularity of their arms, which show clear differences. However, arms aren’t the only way you can
tell a lefty from a righty. You can also look at that individual’s teeth.
How often have you used your teeth
as a tool to hold, pull or tear something? Neanderthals, with their much
stronger jaws, presumably made even more use of their teeth. Wear patterns on
their enamel confirm this. A right-handed person who routinely uses his mouth
as a vise grip will not wear down the same sides of his teeth as a left-handed
person. You can try this yourself (though hopefully not to the point of damaging
your enamel). Thus, by looking at the scratches on fossilized teeth, you can
tell whether that individual was right or left-handed.
Virginie Volpato of the Senckenberg
Research Institute Frankfurt and her colleagues
examined the teeth and skeleton of one particular Neanderthal specimen (Regourdou
1). They found that using his teeth to determine his handedness yielded the
same result as using his arm asymmetry. This strengthens the idea that you can
distinguish right from left-handed Neanderthals and also confirms that most of
them were in fact righties.
Labial scratches on Regourdou 1’s
anterior teeth.
Virginie Volpato, Roberto Macchiarelli, Debbie Guatelli-Steinberg, Ivana Fiore, Luca Bondioli, & David W. Frayer (2012). Hand to Mouth in a Neandertal: Right-Handedness in Regourdou 1 PLoS ONE DOI: 10.1371/journal.pone.0043949.g004
As one of God's Chosen Ones (ie a Sinister Lefty) I think the tooth-wear theory sounds quite logical. there are - as ever - a number of variables that you just can't factor out. For example - for me at least - tasks that involve one hand (writing, throwing etc.)I always perform left-handed, while tasks that involve two hands (holding a bat or knife and fork, digging with a shovel etc.) I more often than not perform as any right-handed person would. Whether this has anything to do with me being left-handed but right-footed I'd love to know.
ReplyDelete(It's also handy for playing cricket as I bowl left-handed but bat right-handed).
Yes. I am quite odd :)