This article is about left- and right-handedness in humans. For physical objects which are "handed", see Chirality. For other uses, see Handedness (disambiguation).
In human biology, handedness is an individual's preferential use of one hand, known as the dominant hand, due to it being stronger, faster or more dextrous. The other hand, comparatively often the weaker, less dextrous or simply less subjectively preferred, is called the non-dominant hand.[2][3][4] In a study from 1975 on 7,688 children in US grades 1–6, left handers comprised 9.6% of the sample, with 10.5% of male children and 8.7% of female children being left-handed.[5][6][7] Overall, around 90% of people are right-handed.[8] Handedness is often defined by one's writing hand, as it is fairly common for people to prefer to do a particular task with a particular hand. There are people with true ambidexterity (equal preference of either hand), but it is rare—most people prefer using one hand for most purposes.
Most of the current research suggests that left-handedness has an epigenetic marker—a combination of genetics, biology and the environment.
Because the vast majority of the population is right-handed, many devices are designed for use by right-handed people, making their use by left-handed people more difficult.[9] In many countries, left-handed people are or were required to write with their right hands. However, left-handed people have an advantage in sports that involve aiming at a target in an area of an opponent's control, as their opponents are more accustomed to the right-handed majority. As a result, they are over-represented in baseball, tennis, fencing,[10]cricket, boxing,[11][12] and mixed martial arts.[13]
^"dominant". Merriam-Webster Dictionary. Merriam-Webster. Archived from the original on 8 March 2017. Retrieved 8 March 2017. 4 : biology : being the one of a pair of bodily structures that is the more effective or predominant in action • dominant eye • used her dominant hand
^"non-". Merriam-Webster Dictionary. Merriam-Webster. Archived from the original on 8 March 2017. Retrieved 8 March 2017. Definition of non- 1 : not : other than : reverse of : absence of • nontoxic • nonlinear. ("Nondominant" is one of 945 words listed under "non-")
^Cite error: The named reference :2 was invoked but never defined (see the help page).
^Harris, Lauren Julius (January 2010). "In fencing, what gives left-handers the edge? Views from the present and the distant past". Laterality. 15 (1–2): 15–55. doi:10.1080/13576500701650430. PMID20391153.