Distorting the visual size of the hand affects hand pre-shaping during grasping
Distorting the visual size of the hand affects hand pre-shaping during grasping
复制标题
DOI：
10.1007/s00221-009-2143-4
复制
发表时间：
2010-04-01
影响因子：
2
通讯作者：
Maravita, Angelo
中科院分区：
文献类型：
--
作者：
Marino, Barbara F. M.;Stucchi, Natale;Maravita, Angelo
已知身体的视觉会影响躯体感觉知觉（例如本体感觉或触觉辨别）。然而，关于一个人自身身体大小的视觉信息是否会影响身体动作还不清楚。我们通过测量最大抓握孔径（MGA）参数来测试这一点，同时8名受试者观看了他们的手达到抓握圆柱体的真实的尺寸、放大或缩小的图像。在放大视图条件下，MGA相对于真实的尺寸视图减小，就好像实际上用物理上更大的手执行抓握运动，因此需要更小的抓握孔来抓握圆柱体。有趣的是，即使在视觉反馈被移除后，MGA仍然较小。相比之下，没有发现减少视图条件的影响。这种不对称性可能反映了这样一个事实，即身体部位的扩大比收缩更频繁，特别是在正常生长期间。总之，视觉的身体可以显着和持久地影响内部模型的身体用于运动编程。
Vision of the body is known to affect somatosensory perception (e.g. proprioception or tactile discrimination). However, it is unknown whether visual information about one's own body size can influence bodily action. We tested this by measuring the maximum grip aperture (MGA) parameter of grasping while eight subjects viewed a real size, enlarged or shrunken image of their hand reaching to grasp a cylinder. In the enlarged view condition, the MGA decreased relative to real size view, as if the grasping movement was actually executed with a physically larger hand, thus requiring a smaller grip aperture to grasp the cylinder. Interestingly, MGA remained smaller even after visual feedback was removed. In contrast, no effect was found for the reduced view condition. This asymmetry may reflect the fact that enlargement of body parts is experienced more frequently than shrinkage, notably during normal growth. In conclusion, vision of the body can significantly and persistently affect the internal model of the body used for motor programming.