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A review of grasping as the movements of digits in space

机译：作为空间中位数的掌握术语

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It is tempting to describe human reach-to-grasp movements in terms of two, more or less independent visuomotor channels, one relating hand transport to the object's location and the other relating grip aperture to the object's size. Our review of experimental work questions this framework for reasons that go beyond noting the dependence between the two channels. Both the lack of effect of size illusions on grip aperture and the finding that the variability in grip aperture does not depend on the object's size indicate that size information is not used to control grip aperture. An alternative is to describe grip formation as emerging from controlling the movements of the digits in space. Each digit's trajectory when grasping an object is remarkably similar to its trajectory when moving to tap the same position on its own. The similarity is also evident in the fast responses when the object is displaced. This review develops a new description of the speed-accuracy trade-off for multiple effectors that is applied to grasping. The most direct support for the digit-in-space framework is that prism-induced adaptation of each digit's tapping movements transfers to that digit's movements when grasping, leading to changes in grip aperture for adaptation in opposite directions for the two digits. We conclude that although grip aperture and hand transport are convenient variables to describe grasping, treating grasping as movements of the digits in space is a more suitable basis for understanding the neural control of grasping.
机译：它令人诱人地描述了两个，或多或少独立的visuomotor通道，一个人的伸展运动，与物体的位置相关，另一个或多或少地将手运输到对象的尺寸。我们对实验工作的审查问题提出了这一框架，因为超越了两个渠道之间的依赖性。缺乏对握孔的尺寸缺乏的影响以及握把孔径的可变性不依赖于物体的尺寸，指示尺寸信息不用于控制握把光圈。另一种方法是描述抓地力形成，从控制空间中的数字的运动。每位数字的轨迹在抓住物体时，在移动时显着类似于其轨迹，以便自行敲击相同的位置。当对象移位时，相似性也在快速响应中显而易见。此审查开发了对应用于抓握的多种效果的速度准确性权衡的新描述。对数字框架的最直接支持是棱镜引起的每个数字的敲击运动适应在抓住时转移到该数字的运动，导致握持触头的变化，以适应两位数的相反方向。我们得出结论，尽管握把孔径和手动运输是描述抓握的方便变量，但作为空间中的数字的运动来说，抓住抓握是理解抓握神经控制的更合适的基础。

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