At least seven of the 45 men [1] who have held the office of United States president have been left-handed. [2] [3] Only one U.S. president prior to the 20th century was known to be left-handed. [4] Since World War II there have been fourteen U.S. presidents [2] and six of them have been left-handed. [5] [6]
Various theories about why left-handers are overrepresented among U.S. presidents have been proposed. Biologist Amar Klar studied handedness and determined that left-handed people, "...have a wider scope of thinking". [6] In a 2019 Journal of Neurosurgery article Nathan R. Selden argued that since left-handed people are right-hemisphere–dominant individuals, this might make presidents, "more effective leaders or at least more effective political candidates". [7] A University of British Columbia psychology professor, Stanley Coren, authored the book The Left-Handed Syndrome, in which he claimed that "left-handers actually have a profile that works very well for a politician". [8] In a 2021 Business Insider article titled, "From Barack Obama to Julius Caesar, here are 12 world leaders who were left-handed" reporters Alexandra Ma and Talia Lakritz state, "According to some research, lefties may be more creative, be better at 'divergent thinking' — generating new ideas based on existing information — and face challenges better." [9] [10]
Medical researcher Jonathan Belsey argued that, given a 13% prevalence of left-handedness, the long-term average is not statistically high, but rather has a p-value of 0.77, and that even the post-1881 prevalence has a 0.10 likelihood of occurring by chance. [3]
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. 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. Overall, around 90% of people are right-handed. 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, but it is rare—most people prefer using one hand for most purposes.
Ambidexterity is the ability to use both the right and left hand equally well. When referring to objects, the term indicates that the object is equally suitable for right-handed and left-handed people. When referring to humans, it indicates that a person has no marked preference for the use of the right or left hand.
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Cross-dominance, also known as mixed-handedness, hand confusion, or mixed dominance, is a motor skill manifestation in which a person favors one hand for some tasks and the other hand for others, or a hand and the contralateral leg. For example, a cross-dominant person might write with the left hand and do everything else with the right one, or manage and kick a ball preferentially with the left leg.
Overall, being mixed handed seems to result in better performance than being strongly handed for sports such as basketball, ice hockey, and field hockey. What these sports have in common is that they require active body movements and also an ability to respond to either side. The situation is reversed for racquet sports such as tennis. Individuals with crossed hand-eye preference seem to be much better at gymnastics, running, and basketball because of the way in which congruent and crossed sided individuals position their bodies.
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Barack Obama, who served as the 44th President of the United States, has elicited a number of public perceptions regarding his personality and background. As the first African-American President of the United States, his race and culture played a prominent role, both positively and negatively.
The first inauguration of Barack Obama as the 44th president of the United States took place on Tuesday, January 20, 2009, at the West Front of the United States Capitol in Washington, D.C. The 56th inauguration, which set a record attendance for any event held in the city, marked the commencement of the first term of Barack Obama as president and Joe Biden as vice president. Based on combined attendance numbers, television viewership, and Internet traffic, it was one of the most-observed events ever by the global audience at the time.
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Bias against people who are left-handed includes handwriting, which is one of the biggest sources of disadvantage for left-handed people, other than for those forced to work with certain machinery. About 90 percent of the world's population is right-handed, and many common articles are designed for efficient use by right-handed people, and may be inconvenient, painful, or even dangerous for left-handed people to use. These may include school desks, kitchen implements, and tools ranging from simple scissors to hazardous machinery such as power saws.
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An estimated 90% of the world's human population consider themselves to be right-handed. The human brain's control of motor function is a mirror image in terms of connectivity; the left hemisphere controls the right hand and vice versa. This theoretically means that the hemisphere contralateral to the dominant hand tends to be more dominant than the ipsilateral hemisphere, however this is not always the case and there are numerous other factors which contribute in complex ways to physical hand preference.