Scaling the components of prehension

被引:16
作者
Cesari, P [1 ]
Newell, KM
机构
[1] Univ Verona, Dept Sport & Movement Sci, I-37131 Verona, Italy
[2] Penn State Univ, Dept Kinesiol, University Pk, PA 16802 USA
关键词
grasping; scaling hand grip configuration; Index of Difficulty;
D O I
10.1123/mcj.6.4.347
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
The experiment reported examined: (a) the role of the geometrical body scaled informational invariant for the transition of human grip configurations; (b) whether the same invariant can be scaled considering also the force applied during the grasp phase; and (c) how the temporal duration of the grasp and displacement phases of prehension are scaled to the object properties of size and mass. Adult subjects performed a series of trials in reaching, grasping, and displacing spheres that varied in size and mass. The grip transitions were described by the body scaled relation: K = log L-s + (a + bMh + cLh)/(log Ms) where L-s and M-s are, respectively, the diameter and the mass of the spheres grasped and L-h and M-h are the length and the mass of the hand. The impulse during the grasp phase was linearly related with the mass of the spheres within each density. The temporal durations of the grasp and displacement components were scaled coherently to the object properties. These findings provide support to the hypothesis that the grasp and displacement components of prehension are organized coherently within a single action.
引用
收藏
页码:347 / 365
页数:19
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