Motor Variability but Functional Specificity: The Case of a C4 Tetraplegic Mouth Calligrapher
Motor Variability but Functional Specificity: The Case of a C4 Tetraplegic Mouth Calligrapher
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DOI：
10.1080/10407413.2013.780492
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发表时间：
2013-04-01
影响因子：
1.9
通讯作者：
Nonaka, Tetsushi
中科院分区：
文献类型：
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作者：
Nonaka, Tetsushi
这项研究考察了一名特殊四肢瘫痪患者的运动协调能力，该患者已经用口握毛笔练习日本书法超过 25 年，达到了大师水平。在实验中，书法家在一张墨纸上多次书写同一个汉字。非受控流形分析揭示了关节自由度之间的协变形式，以便在不同的任务实现中保持刷压力、刷角度和直立头部姿势不变，同时允许不影响这些任务变量的关节配置波动。同时控制 3 个任务变量的事实进一步表明，技能的获取不仅是学习控制每个任务变量的问题，而且是学习嵌套不同层的活动的问题，这些活动控制与环境的多种功能关系，以免一层与另一层功能失调。
This study examined the movement coordination in an exceptional tetraplegic individual who has practiced Japanese calligraphy with a mouth-held brush for over 25 years to reach master level. In the experiment, the calligrapher wrote the same Chinese character on a sheet of ink paper multiple times. The uncontrolled manifold analysis revealed the forms of covariation among joint degrees of freedom so as to keep the brush pressure, brush angle, and upright head posture invariant over different realizations of the task while allowing for joint configuration fluctuations that do not affect these task variables. The fact that the 3 task variables were simultaneously controlled further suggested that the acquisition of the skill was not only a matter of learning to control each of the task variables but also a matter of learning to nest different layers of activities that control the multiple functional relationships to the environment in such a way as not to be dysfunctional for one layer to another.