An international study of human handedness: The data
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TL;DR
Methods for determining handedness, the probability of a genetic component forhandedness, and the relationship of sex, birth order, multiple birth, and first-degree relative's handedness on subject'shandedness are discussed.
Abstract
Human handedness has been the subject of systematic study since 1646, but there is no agreement among researchers as to who can be considered a left-hander, what is the etiology of left-handedness, or what the proportion of left-handedness is in the world's population. This article reports the results of a handedness survey administered to 12,000 subjects in 17 countries, the largest handedness survey attempted. The paper discusses methods for determining handedness, the probability of a genetic component for handedness, and the relationship of sex, birth order, multiple birth, and first-degree relative's handedness on subject's handedness. A hypothesis for the etiology of left-handedness is presented.
