Someone who is right-handed will prefer to use this hand for everyday activities, such as writing, maintaining personal hygiene, cooking and so forth. "Handwriting" redirects here For scripts for writing down notes by hand see " Cursive " Hygiene refers to practices associated with ensuring good health and cleanliness Cooking is the process of preparing Food by applying Heat, selecting measuring and combining of ingredients in an ordered procedure for producing safe and edible According to a variety of studies, anywhere from 70% to 90%[1][2] of the world population is right-handed, while most of the remaining are left-handed. The world population is the total number of living Humans on Earth at a given time A small percentage of the population can use both hands equally well; a person with this ability is deemed to be ambidextrous. Ambidexterity is the state of being equally adept in the use of both right and left Appendages (such as the Hands)
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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. [2]. 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. [3]. 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 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. Association football, more commonly known as football or soccer, is a Team sport played between two teams of eleven players and is widely considered [4]
People typically also have a dominant eye, a preference known as ocular dominance. Ocular dominance, sometimes called eye dominance or eyedness, is the tendency to prefer visual input from one Eye to the other There is only a weak correlation between being right handed and left eyed. [5]
Theories explaining right-hand dominance
- Warrior and his shield theory: This theory attempts to explain right-handedness by the position of a warrior's shield and his heart. Handedness is an attribute of human beings defined by their unequal distribution of Fine motor skill between the left and right Hands. A shield is a protective device meant to intercept attacks The term often refers to a device that is held in the hand as opposed to Armour or a Bullet proof vest The heart is a muscular organ in all Vertebrates responsible for pumping Blood through the Blood vessels by repeated rhythmic Basically, since the heart is slightly nearer to the left side of the body, a right-handed warrior (who holds his shield with his left hand to free the right hand for a weapon) would be better able to protect his heart and therefore more likely to survive.
- Brain hemisphere division of labor: The premise of this theory is that since both speaking and handiwork require fine motor skills, having one hemisphere of the brain do both would be more efficient than having it divided up. Fine motor skills can be defined as coordination of small Muscle movements which occur e The brain is the center of the Nervous system in animals All Vertebrates and the majority of Invertebrates have a brain
Right-handedness in society
In the past, many schools around the world forced left-handed children to write right-handed. [1] In Hinduism, the right hand must be used for all auspicious and respectful activity, including eating, giving, receiving, and worshipful offering. Hinduism is a religious tradition that originated in the Indian subcontinent. 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. For other meanings including people named 'Islam' see Islam (disambiguation. [6]
A very 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, 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. [7]
See also
References
- ^ a b Holder, M. Asymmetry is the absence of or a violation of a Symmetry. In organisms Due to how cells divide in Organisms asymmetry in organisms is Handedness is an attribute of human beings defined by their unequal distribution of Fine motor skill between the left and right Hands. Boardsports such as Skateboarding, Surfing, Wakeboarding and Snowboarding essentially involve the body's being oriented sideways relative to its overall Ocular dominance, sometimes called eye dominance or eyedness, is the tendency to prefer visual input from one Eye to the other An Orthodox stance in combat sports such as boxing and karate refers to someone who boxes right-handed as opposed to a left-handed fighter who is referred to as a Southpaw. Boxing (sometimes also known as English boxing or pugilism) is a Combat sport in which two participants generally of similar weight, K. (1997). Why are more people right-handed?. Sciam. com. Scientific American Inc. Retrieved on 2008-04-14. 2008 ( MMVIII) is the current year in accordance with the Gregorian calendar, a Leap year that started on Tuesday of the Common Events 43 BC - Battle of Forum Gallorum: Mark Antony, besieging Julius Caesar 's assassin Decimus Junius Brutus in
- ^ a b Psychology for A-level second edition, page 309
- ^ BBC website
- ^ Toddler Today website
- ^ Porac C, Coren S. Is eye dominance a part of generalized laterality? Percept Mot Skills. 1975 Jun;40(3):763-9. PMID 1178363.
- ^ Muslim Restrooms
- ^ BBC NEWS | Health | Left-handers have different view
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