Extension of perceived arm length following tool-use: Clues to plasticity of body metrics
Extension of perceived arm length following tool-use: Clues to plasticity of body metrics
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DOI：
10.1016/j.neuropsychologia.2012.05.022
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发表时间：
2012-07-01
期刊：
影响因子：
2.6
通讯作者：
Maravita, Angelo
中科院分区：
文献类型：
--
作者：
Sposito, Ambra;Bolognini, Nadia;Maravita, Angelo
人类拥有非常准确的身体部位尺寸表示法。最近的证据表明，通过二等分任务评估的身体部位长度的空间估计，甚至比非物质外部物体的估计更准确(Sposito，Bologniti，Vallar，Posteraro，&Maravita(2009))。在这篇论文中，我们表明，与使用工具前相比，受试者在使用60厘米长的工具进行15分钟的训练后，估计保持放射状姿势的前臂中点更远。这一结果与参与者前臂长度的增加是一致的。对照实验表明，这一结果并不是仅仅由于使用工具而引起的远端本体感觉移位，而且在使用20厘米长的功能无关的工具后也没有重复出现。这些结果有力地支持了这样的观点，尽管对自己的身体指标的内在知识似乎是身体表征的更稳定的特征之一，但需要使用工具来扩展自然动作范围的身体-空间交互需要在身体指标表征方面发生可测量的动态变化。(C)2012爱思唯尔有限公司。保留所有权利。
Humans hold a very accurate representation of the metrics of their body parts. Recent evidence shows that the spatial estimation of body parts length, as assessed through a bisection task, is even more accurate than that of non-corporeal extrapersonal objects (Sposito, Bolognini, Vallar, Posteraro, & Maravita (2009)). In the present paper we show that human participants estimate the mid-point of their forearm, which was kept in a radial posture, to be more distal following a 15-min training with a 60 cm-long tool as compared to pre tool-use. This outcome is compatible with an increased representation of the participants' forearm length. Control experiments show that this result was not due to a mere distal proprioceptive shift induced by tool-use, and was not replicated following the use of a 20 cm-long, functionally irrelevant tool. These results strongly support the view that, although the inner knowledge of one's own body metrics appears to be one of the more stable features of body representation, body-space interactions requiring the use of tools that extend the natural range of action, entail measurable dynamic changes in the representation of body metrics. (C) 2012 Elsevier Ltd. All rights reserved.