Tool-use reshapes the boundaries of body and peripersonal space representations
Tool-use reshapes the boundaries of body and peripersonal space representations
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DOI：
10.1007/s00221-013-3532-2
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发表时间：
2013-07-01
影响因子：
2
通讯作者：
Serino, Andrea
中科院分区：
文献类型：
--
作者：
Canzoneri, Elisa;Ubaldi, Silvia;Serino, Andrea
与环境中的对象的交互通常需要将关于对象位置的信息与身体部位的位置和大小相结合。前一种信息被编码在身体周围空间的多感官表征中，这是一种近个人空间的表征（PPS），而后者则通过在线的、不断更新的、以动作为导向的身体多感官表征（BR）来实现。使用工具作用于相对较远的对象扩展了PPS表示。这种效应被解释为表明工具可以被纳入BR。然而，经验数据表明，工具的使用，同时影响PPS表示和BR是缺乏的。为了研究这个问题，我们评估的程度PPS表示通过听觉触觉交互任务和BR通过触觉距离感知任务和身体地标定位任务，之前和之后使用1米长的工具，以达到远的对象。工具使用延长代表性的PPS沿着工具轴和同时成形BR;工具使用后，受试者认为他们的前臂窄，长比工具使用前，形状更相似的工具之一。工具的使用是必要的，以诱导这些效果，因为指向任务并不影响PPS和BR。这些结果表明，一个简短的培训与工具诱导塑性变化的感知尺寸的身体部位作用于工具和它周围的空间，这表明一个强烈的重叠的周边空间和身体表征。
Interaction with objects in the environment typically requires integrating information concerning the object location with the position and size of body parts. The former information is coded in a multisensory representation of the space around the body, a representation of peripersonal space (PPS), whereas the latter is enabled by an online, constantly updated, action-orientated multisensory representation of the body (BR). Using a tool to act upon relatively distant objects extends PPS representation. This effect has been interpreted as indicating that tools can be incorporated into BR. However, empirical data showing that tool-use simultaneously affects PPS representation and BR are lacking. To study this issue, we assessed the extent of PPS representation by means of an audio-tactile interaction task and BR by means of a tactile distance perception task and a body-landmarks localisation task, before and after using a 1-m-long tool to reach far objects. Tool-use extended the representation of PPS along the tool axis and concurrently shaped BR; after tool-use, subjects perceived their forearm narrower and longer compared to before tool-use, a shape more similar to the one of the tool. Tool-use was necessary to induce these effects, since a pointing task did not affect PPS and BR. These results show that a brief training with a tool induces plastic changes both to the perceived dimensions of the body part acting upon the tool and to the space around it, suggesting a strong overlap between peripersonal space and body representation.