Children in three school grades (kindergarten, Grades 2 and 4) were given 21 preference tasks (unimanual and bimanual) and 5 skill tasks, with half the children retested after a 2-wk. interval. Age changes in performance on each task, in intercorrelations among tasks, and in the reliability of retest performance point to several ways in which tasks differ from one another and also to the general importance of considering the growth of skill in both hands and the development of divisions of labor between them.
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Hana Bruml (1972) studied this question.
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