Shaping multisensory action-space with tools:: evidence from patients with cross-modal extinction
Shaping multisensory action-space with tools:: evidence from patients with cross-modal extinction
复制标题
DOI：
10.1016/j.neuropsychologia.2004.11.010
复制
发表时间：
2005-01-01
期刊：
影响因子：
2.6
通讯作者：
Làdavas, E
中科院分区：
文献类型：
--
作者：
Farnè, A;Iriki, A;Làdavas, E
神经生理学、神经心理学和心理学的最新发现表明，个人周围空间是通过整合的多感觉加工来表现的。在人类中，个人周边空间表征和动作执行之间的相互作用可以通过使用工具来揭示，这些工具通过扩展可到达的空间来修改视觉-触觉消退的强度。我们之前已经证明，视觉和触觉相结合的手周空间可以根据工具的使用而扩展和收缩。在这里，我们表明这些动态变化严重依赖于主动工具的使用，因为它们不是在同样长的、但被动地暴露于细长的(手+工具)身体配置之后发现的。我们还表明，在固定的远端位置(距手60厘米)评估的手周空间伸长的程度根据工具长度的不同而不同，因此30厘米长的工具产生的伸长比60厘米长的工具产生的伸长要小。这首次揭示了细长区域的远端边界并不明显地局限于工具长度，而是延伸到其物理尺寸之外，包括工具周围空间，由此视觉-触觉整合的强度似乎减弱。值得注意的是，当使用30厘米长的工具与使用物理上60厘米长、但操作上30厘米长的工具产生的效果进行比较时，发现手周间隙延长的程度相似。通过分离这种“混合”工具，我们在这里提供了第一个证据，即工具使用后手周空间的延长程度与工具的功能有效长度密切相关，而不仅仅是工具的绝对长度。(C)2004爱思唯尔有限公司。保留所有权利。
Recent findings from neurophysiology, neuropsychology and psychology have shown that peri-personal space is represented through an integrated multisensory processing. In humans, the interaction between peri-personal space representation and action execution can be revealed through the use of tools that, by extending the reachable space, modify the strength of visual-tactile extinction. We have previously shown that the peri-hand space whereby vision and touch are integrated can be expanded, and contracted, depending upon tool-use. Here, we show that these dynamic changes critically depend upon active tool-use, as they are not found after an equally long, but passive exposure to an elongated (hand + tool) body configuration. We also show that the extent of the peri-hand space elongation, as assessed at fixed far location (60 cm from the hand), varies according to the tool length such that a 30 cm long tool produced less elongation than a 60 cm long tool. This reveals for the first time that the distal border of elongated area is not sharply limited to the tool length, but extends beyond its physical size to include a peri-tool space whereby the strength of visual-tactile integration seems to fade. Remarkably, a similar amount of peri-hand space elongation was found when the effects of using a 30 cm long tool were compared with those produced by using a tool that was physically 60 cm long, but operationally 30 cm long. By dissociating with this 'hybrid' tool, the amount of space that is globally added to the hand (60 cm) from the one that is actually reachable (30 cm), we provide here the first evidence that the extent of peri-hand space elongation after tool use is tightly related to the functionally effective length of the tool, and not merely to its absolute length. (C) 2004 Elsevier Ltd. All rights reserved.