Contact points during multidigit grasping of geometric objects
Contact points during multidigit grasping of geometric objects
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DOI：
10.1007/s00221-011-2980-9
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发表时间：
2012-03-01
影响因子：
2
通讯作者：
Deubel, Heiner
中科院分区：
文献类型：
--
作者：
Gilster, Rene;Hesse, Constanze;Deubel, Heiner
研究了多指抓取不同物体时接触点的选择问题。在实验1中，抓住圆柱体并将其举起。参与者被告知他们应该使用的手指数量，从两个手指抓握到五个手指抓握不等，或者可以用他们喜欢的手指抓取。我们发现，指尖在物体上的位置与使用的手指数量之间存在很强的关系。总的来说，联络点的选择在内部以及参与者之间的可变性都很低。虚拟手指被定义为手指与拇指相对的几何平均位置，与拇指几乎完全相反，这意味着在抓握中使用所有贡献的手指形成一个功能单位。在实验2中，抓取了四个更复杂的形状(矩形、六边形、五边形、弧形物体)。虽然我们发现在接触点的选择上，参与者之间有一些适度的变异性，但参与者内部的变异性仍然非常低。在这两个实验中，参与者表现出强烈的偏好，当让他们自由选择时，在抓握时使用四个或五个手指。综上所述，我们的发现表明，抓取运动是预先计划的，抓取是手指之间协调相互作用的结果，这不能被理解为独立的手指运动。
We investigated the choice of contact points during multidigit grasping of different objects. In Experiment 1, cylinders were grasped and lifted. Participants were either instructed as to the number of fingers they should use, ranging from a two-finger grasp to a five-finger grasp, or could grasp with their preferred number of fingers. We found a strong relationship between the position of the fingertips on the object and the number of fingers used. In general, variability in the choice of contact points was low within-as well as between participants. The virtual finger, defined as the geometric mean position of fingers opposing the thumb, was in almost perfect opposition to the thumb, suggesting the formation of a functional unit using all contributing fingers in the grasp. In Experiment 2, four more complex shapes (rectangle, hexagon, pentagon, curved object) were grasped. Although we found some moderate between-participant variability in the choice of contact points, the within-participant variability was again remarkably low. In both experiments, participants showed a strong preference to use four or five fingers during grasping when left with free choice. Taken together, our findings suggest a preplanning of the grasping movement and that grasping results from a coordinated interplay between the fingers contributing to the grasp that cannot be understood as independent digit movements.