Age differences in noise and variability of isometric force production

被引:79
作者
Deutsch, KM [1 ]
Newell, KM [1 ]
机构
[1] Penn State Univ, Dept Kinesiol, University Pk, PA 16802 USA
关键词
isometric force; noise; motor development; variability;
D O I
10.1006/jecp.2001.2642
中图分类号
B844 [发展心理学(人类心理学)];
学科分类号
040202 [发展与教育心理学];
摘要
This study examined whether age-related improvements observed in the motor performance of children result from a reduction of noise in the output of the sensori-motor system. Children ages 6, 8, and 10 years and young adults (N = 48, 12 per group) performed continuous, constant isometric force contractions with the index finger at four different force levels with and without visual feedback, The results revealed that: (a) performance improved with increases in age, (b) the force output signal exhibited increased irregularity and a more broadband frequency profile with increases in age under conditions with feedback, and (c) there were no age differences in the irregularity of the force signal and smaller age differences in the frequency profiles under conditions without feedback. It is proposed that the age-related enhancements in performance throughout childhood are primarily due to a more appropriate mapping of the organization of the sensori-motor system to the task constraints rather than to reduction of system noise. (C) 2001 Academic Press.
引用
收藏
页码:392 / 408
页数:17
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