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Handedness is a better (faster or more precise) performance or individual preference for use of a hand, known as the dominant hand.〔Holder, M.K. (What does Handedness have to do with Brain Lateralization (and who cares?) ). Retrieved 11 August 2012.〕 Handedness is not a discrete variable (right or left), but a continuous one that can be expressed at levels between strong left and strong right. There are four types of handedness: left-handedness, right-handedness, mixed-handedness, and ambidexterity.〔 Left-handedness is somewhat more common among men than among women. == Types == * ''Right-handedness'' is most common. Right-handed people are more skillful with their right hands when performing tasks. Studies suggest that 70–90% of the world population is right-handed.〔Psychology for A-level ''second edition, page 309''〕 * ''Left-handedness'' is less common than right-handedness. Left-handed people are more skillful with their left hands when performing tasks. Studies suggest that approximately 10% of the world population is left-handed. * ''Cross-dominance or Mixed-handedness'' is the change of hand preference between tasks. This is common in the population with about a 30% prevalence.〔 * ''Ambidexterity'' is exceptionally rare, although it can be learned. A truly ambidextrous person is able to do any task equally well with either hand. Those who learn it still tend to favor their originally dominant hand.〔 * ''Ambilevous ''or ''ambisinister'' people demonstrate awkwardness with both hands. Ambisinistrous motor skills or a low level of dexterity may be the result of a debilitating physical condition, such as "Dysgraphia". 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Handedness」の詳細全文を読む スポンサード リンク
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