Dynamic size-change of hand peripersonal space following tool use
Dynamic size-change of hand peripersonal space following tool use
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DOI：
10.1097/00001756-200006050-00010
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发表时间：
2000-06-05
期刊：
影响因子：
1.7
通讯作者：
Làdavas, E
中科院分区：
文献类型：
--
作者：
Farnè, A;Làdavas, E
人类和猴子共享相似的触觉和手周围视觉输入的感觉综合处理，用于编码手周围的个人空间。在猴子中，工具的使用被认为会引起以手为中心的周围空间沿工具轴沿着的短暂延长。在这里，我们报告的证据表明，也在人类中，使用的工具可以增加的空间范围内的表示手周围的视觉空间，将该工具。我们研究了这种现象，在患者的触觉消退，通过使用跨模态范式非常适合揭示患者的手附近的视觉-触觉整合。在本研究中，在远离患者同侧手的手持耙的远端边缘处评估跨模态消光。我们发现，跨模态消光更严重后，患者使用的耙检索远距离的物体相对于耙不使用的条件。这种手周围空间扩大的证据在使用工具后仅持续了几分钟。相比之下，周围的手的空间扩张时，没有观察到电机动作对远处的物体不涉及的工具。这些研究结果表明，视觉周围的手空间在人类中具有重要的动态特性，它可以扩大和收缩取决于工具的使用。NeuroReport 11：1645-1649（C）2000 Lippincott威廉姆斯和威尔金斯。
Humans and monkeys share similar sensory integrated processing of tactile and peri-hand visual inputs for coding peripersonal space surrounding the hand. In monkeys, tool use is known to induce a transient elongation of hand-centred peripersonal space along the tool axis. Here we report evidence that, also in humans, the use of a tool can increase the spatial extent of the representation of peri-hand visual space to incorporate the tool. We investigated this phenomenon in patients with tactile extinction, by using a cross-modal paradigm well suited to reveal visual-tactile integration near patients' hand. In the present study cross-modal extinction was assessed far from patients' ipsilesional hand, at the distal edge of a hand-held rake. We found that cross-modal extinction was more severe after patients used the rake to retrieve distant objects with respect to a condition in which the rake was not used. This evidence of an expansion of peri-hand space lasted only a few minutes after tool use. By contrast, peri-hand space expansion was not observed when motor actions towards distant objects did not involve the tool. These findings show that visual peri-hand space has important dynamic properties in humans; it can be expanded and contracted depending upon tool use. NeuroReport 11:1645-1649 (C) 2000 Lippincott Williams & Wilkins.