Measures of hand speed in 45 children having two sinistral parents showed an equal division between children faster with the right hand and children faster with the left hand. The mean difference was very close to zero and the standard deviation was not less than that of unselected samples. These observations are compatible with the theory that the factor usually biasing handedness toward dextrality is absent in these children and that their laterality is determined mainly by accidental variation.
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Marian Annett (1974) studied this question.
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