The integration of haptically acquired size information in the programming of precision grip
The integration of haptically acquired size information in the programming of precision grip
复制标题
将触觉获取的尺寸信息集成到精密夹具的编程中
DOI：
10.1007/bf00229825
复制
发表时间：
2004
影响因子：
2
通讯作者：
G. Westling
中科院分区：
文献类型：
--
作者：
Andrew M. Gordon;Hans Forssberg;Roland S. Johansson;G. Westling
概述最近Gordon等人（1991）给出了在精确抓握的程序设计中使用视觉提示的证据。视觉上唤起的与尺寸相关的信息影响了用于产生升力的物理力，即使它与其他感官信息不一致。在本研究中，被蒙住眼睛的受试者被要求感觉到一个物体的大小触觉探索之前解除it. Two箱子的重量相等，大小不等的电梯对象，并连接到一个仪表（抓地力）处理。测量夹持力和负载力及其变化率，以及物体的垂直移动。大多数受试者报告说，小盒子更重，这与大小-重量错觉预测一致。然而，当箱子随机呈现时，大箱子的峰值握力、握力率、峰值载荷力和载荷力率更大，但当连续举起相同的箱子时则不然。如果受试者在提升之前没有感觉到箱子，则这些参数在通常用于大箱子和小箱子的参数之间缩放。大多数受试者显然编程的平行增加的抓地力和负载力在负载阶段作为一个力率脉冲。这代表了一种“目标策略”，其中物体重量的内部神经表示确定了实际的目标参数（即刚好足够克服重力所需的力）。其他受试者表现出缓慢的逐步增加的抓地力和负荷力率。选择这种“探测策略”的受试者并没有对两个盒子的力参数进行不同的缩放。此外，他们没有察觉到物体重量之间的任何差异。总之，这些结果表明，触觉探索可用于传达尺寸信息，并进一步支持假设，即尺寸相关的信息可以与其他感官信息相结合的编程中的精度抓地力。
SummaryRecent evidence for the use of visual cues in the programming of the precision grip has been given by Gordon et al. (1991). Visually invoked size-related information influenced the physical forces used to produce a lift, even when it was not consistent with other sensory information. In the present study, blind-folded subjects were required to feel the size of an object by haptic exploration prior to lifting it. Two boxes of equal weight and unequal size were used for the lift objects and were attached to an instrumented (grip) handle. Grip force and load force, their rates, and the vertical move ment of the object were measured. Most subjects report that the small box was heavier, which is consistent with size-weight illusion predictions. However, peak grip force, grip force rate, peak load force, and load force rate were greater for the large box when the boxes were randomly presented, but not when the same boxes were lifted consecutively. If subjects did not feel the box prior to a lift, these parameters were scaled in between those normally employed for the large and small box. Most subjects apparently programmed the parallel increase of the grip and load force during the loading phase as one force rate pulse. This represented a “target strategy” in which an internal neural representation of the objects weight determined the actual target parameter (i.e. just enough force required to overcome gravity). The other subjects exhibited a slower stepwise increase in grip and load force rate. The subjects choosing this “probing strategy” did not scale the force parameters differently for the two boxes. Furthermore, they did not perceive any difference between the objects' weight. Together, these results suggest that haptic exploration may be used to convey size information and further support the hypoth esis that size-related information may be combined with other sensory information in the programming of the precision grip.