Quick repetitive motion was examined in 10 children of 5 years and 16 children of 6 years by means of a tapping enumerator.
Using their right hand they regularly had a daily practice, consisting of 5 practices of 10 secons each repeated with an interval of 1 minute.
The first practice period had a length of two weeks excepting Sundays. Af ter two weeks' rest perlod came the second practice period of one week. The third and the fourth practice periods, each of a week, were also applied after two weeks' rest from the preceding period of practice.
Some of the results worth of recording are as follows :
(1) E -ect of practice was remarkable during the first 6 days, acquiring 112. 1/3 of the whole frequency increment gained in the whole period of practice stretching over about 3 months.
(ii) In 5-year children, interruption of practice tended to reduce the acquired extra-achievement. With the repetition of practice, however, the p -actice effect tended to persist. Great individual difference was observed in this respect.
(iii) Practice with the right hand, not only enhanced achievement with the right hand, but also improved the left hand, though in a slighter degree
i. e. by 7 %.
(iv) Averge tapping frequency before and after the practice is as follows :
Tappings for 10 sec.
The values after the practice correspond to those of 5-6 th grade children of elementary schools.
(v) When the same children were examined for remote effect in the 2 rid grade, they were found to retain the motor ability acquired by our practice 32 or 20 months previously. Their results are superior to those of other groups without experience of our practice. There was a statistically significant difference
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