Immediate tool incorporation processes determine human motor planning with tools.
Immediate tool incorporation processes determine human motor planning with tools.
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DOI：
10.1038/ncomms5524
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发表时间：
2014-07-31
影响因子：
16.6
通讯作者：
Ikegami, T.
中科院分区：
文献类型：
--
作者：
Ganesh, G.;Yoshioka, T.;Osu, R.;Ikegami, T.
人类使用工具的灵活性被认为是源于我们将工具作为身体的一部分整合和使用的能力。然而，工具整合，明显的扩展，在我们的身体表征和个人周围的空间，已被观察到主要是延长工具暴露后，并不能解释我们的即时运动行为，当我们改变工具。在这里，我们利用两个新的实验来阐明存在额外的即时工具纳入的影响，确定电机规划工具。有趣的是，工具被观察到立即诱导一个试验的试验，工具长度依赖缩短的感知肢体长度，相反的观察延长后的工具使用。因此，我们的研究结果表明，工具诱导我们的身体表征的双重影响，一个立即缩短，严重影响电机规划与新的工具，和缓慢的伸长，可能是一个结果的技能相关的变化，在感觉运动映射与重复使用的工具。 以往的研究表明，重复使用工具的结果在身体表征的扩展。Ganesh等人现在表明，除了身体表征的扩展之外，工具的使用还伴随着在逐个试验的基础上感知的手臂长度的立即缩短。
Human dexterity with tools is believed to stem from our ability to incorporate and use tools as parts of our body. However tool incorporation, evident as extensions in our body representation and peri-personal space, has been observed predominantly after extended tool exposures and does not explain our immediate motor behaviours when we change tools. Here we utilize two novel experiments to elucidate the presence of additional immediate tool incorporation effects that determine motor planning with tools. Interestingly, tools were observed to immediately induce a trial-by-trial, tool length dependent shortening of the perceived limb lengths, opposite to observations of elongations after extended tool use. Our results thus exhibit that tools induce a dual effect on our body representation; an immediate shortening that critically affects motor planning with a new tool, and the slow elongation, probably a consequence of skill related changes in sensory-motor mappings with the repeated use of the tool. Previous studies have shown that repeated tool use results in extension of body representation. Ganesh et al. now show that in addition to extension of body representation, tool use is also accompanied by an immediate shortening of perceived arm length on a trial-by-trial basis.
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