Digit Position and Forces Covary during Anticipatory Control of Whole-Hand Manipulation.
Digit Position and Forces Covary during Anticipatory Control of Whole-Hand Manipulation.
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DOI：
10.3389/fnhum.2016.00461
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发表时间：
2016
影响因子：
2.9
通讯作者：
Gordon AM
中科院分区：
文献类型：
--
作者：
Marneweck M;Lee-Miller T;Santello M;Gordon AM
预期规划的对象操作的理论观点，传统上是由研究了运动学（手的形状和手指的位置）和动力学（力）在隔离。这就限制了我们对这些领域的整合的理解，这些领域最近被证明是相互依赖的。具体来说，最近的研究显示，在加载阶段的两个手指抓的手指位置和负载力的强协变。在这里，我们确定这种手指力-位置协变是否是抓握的一般特征。研究了五指整手操纵质量分布可变的物体时手指位置和力的协调性。受试者被指示在托举过程中防止物体滚动。正如在精确抓取中发现的那样，手指的位置和力量存在很强的试对试协变。这表明，手指位置的自然变化是由手指力的试验到试验变化补偿的，这是抓握控制的基本特征，而不仅仅是精确抓握所特有的。然而，与精确抓取的主要区别在于，手指位置对物体质量分布的调节主要由拇指驱动，手指位置几乎没有调节。拇指位置而不是手指的调制可能是由于其更大的运动范围，因此适应对象属性。我们的研究结果强调了中枢神经系统的灵活性，在实施一系列的解决方案沿着手指的力量，位置连续灵巧的操作。
Theoretical perspectives on anticipatory planning of object manipulation have traditionally been informed by studies that have investigated kinematics (hand shaping and digit position) and kinetics (forces) in isolation. This poses limitations on our understanding of the integration of such domains, which have recently been shown to be strongly interdependent. Specifically, recent studies revealed strong covariation of digit position and load force during the loading phase of two-digit grasping. Here, we determined whether such digit force-position covariation is a general feature of grasping. We investigated the coordination of digit position and forces during five-digit whole-hand manipulation of an object with a variable mass distribution. Subjects were instructed to prevent object roll during the lift. As found in precision grasping, there was strong trial-to-trial covariation of digit position and force. This suggests that the natural variation of digit position that is compensated for by trial-to-trial variation in digit forces is a fundamental feature of grasp control, and not only specific to precision grasp. However, a main difference with precision grasping was that modulation of digit position to the object’s mass distribution was driven predominantly by the thumb, with little to no modulation of finger position. Modulation of thumb position rather than fingers is likely due to its greater range of motion and therefore adaptability to object properties. Our results underscore the flexibility of the central nervous system in implementing a range of solutions along the digit force-to-position continuum for dexterous manipulation.
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影响因子：
5.4
作者：
Lashley, KS
通讯作者：
Lashley, KS
影响因子：
2.5
作者：
Santello, M;Soechting, JF
通讯作者：
Soechting, JF
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GORDON, AM;WESTLING, G;JOHANSSON, RS
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JOHANSSON, RS
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Fu, Qiushi;Santello, Marco
通讯作者：
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作者：
Rearick, MP;Santello, M
通讯作者：
Santello, M