Why are more people right-handed? M.K. Holder is an affiliated scientist in the Center for the Integrative Study of Animal Behavior at Indiana University. She replies: In the 160 years in which "handedness" has been studied we have learned quite a lot, but we still cannot precisely describe what causes humans preferentially to use one hand over the other, or why human populations are biased toward right-hand use rather than left-hand use. Scientists disagree over what percentage of human populations are "right-handed" or "left-handed" because there is no standard, empirical definition for measuring "handedness"; our criteria vary, and are based on various theoretical explanations because we are still trying to understand the mechanisms involved. But I can describe in general terms what we do know. Most humans (say 70 percent to 95 percent) are right-handed, a minority (say 5 percent to 30 percent) are left-handed, and an indeterminate number...
WE ARE PROUDLY LOADED

Comments
Post a Comment