Abstract
The development of manual asymmetry was studied in rhythmic tapping tasks and in repetitive timed tapping tasks on a sample of normal 6- and 9-year-olds. All subjects were right-handed. On all tappings tasks performance improved between 6 and 9 years of age. The right preferred hand induced better performance than the left non-preferred hand on all tasks except successive tapping on one key with the four fingers. On rhythmic tapping tasks the asymmetry in stability of rhythm favoring the right hand was more pronounced in younger than in older children. However, asymmetry in the discrepancy between the expected and the actual number of beats per trial on rhythmic tapping did not change with age. On the three repetitive timed tasks there was no change of asymmetry with age. These results are analyzed in the light of findings reported by other authors.
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