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Why is the population right-hand dominant?
There is no prevailing theory that explains why right-handedness is so much more prevalent than left-handedness.. Neurologically, the motor skills of the right side of the body are controlled by the left hemisphere of the brain, so researchers believe the explanation may ultimately be found in the differences between the two halves of the brain. For example, a recent study found that right-handers use the right side of the brain to focus on an entire image, but the left side of the brain to focus on details within an image.. This observed difference, like many others, shows the effects of right-handedness but does not clearly indicate its cause.
Left/right-footedness and ocular dominance
Right handed people have been known to not be left footed
Being right-handed does not always mean that the favoured foot is also on the right side. When playing soccer for instance, many people prefer using their left foot rather than the right, despite being right-handed.
People typically also have a dominant eye, a preference known as ocular dominance. There is only a weak correlation between being right handed and left eyed. 
Theories explaining right-hand dominance
Right-handedness in society
In the past, many schools around the world forced left-handed children to write right-handed. In Hinduism, the right hand must be used for all auspicious and respectful activity, including eating, giving, receiving, and worshipful offering. The left hand is used in times of inauspiciousness, as a sign of disrespect, and for wiping oneself after using the bathroom. In Islam as well, one is required to use the left hand for tasks such as wiping oneself after using the bathroom and the right hand for eating.
A good number of technological devices are made primarily for right-handers; examples of everyday objects primarily designed for right-handers include refrigerators, scissors, microwaves, can-openers, button-up shirts, computer mice, and padded kitchen mittens (padded on one side only). Left-handed golf clubs are more difficult to find than right-handed ones. Many classical-era Japanese swords were (and even modern cooking knives are) favored to cut more efficiently for the right-hander. Musical instruments such as guitars are also set up for right-handers. Military rifles designed to be shot only from the right shoulder have resulted in injuries from spent cartridge casings hitting left-handers in the eye and head.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Right-handedness". A list of authors is available in Wikipedia.|