Perturbation to force sharing patterns in 5-digit grasps

描述（由申请人提供）：患有某些神经和肌肉骨骼疾病的个体，抓握时的小PHS力协调严重受损。基本了解力量协调的发展对这些个体的手功能的康复和恢复是必不可少的。本研究的目的是为了更好地理解在抓握过程中多重抓握力的时空协调机制。这一目标将通过检查非自愿纠正力对扰动的反应来实现，以稳定的力量分享模式在五位数抓取期间。将引入一种新的程序，引起单个数字的瞬态力变化，破坏力共享模式。该提案的具体目的是确定不同的1)力扰动参数（数字扰动，力的方向）和2)初始力共享模式对补偿扰动而开发的非自愿纠正力响应的影响。我们的初步数据表明，无意识的纠正反应参与其中。我们将测试校正力响应将取决于受干扰的手指在保持抓握稳定性方面的功能作用。

DESCRIPTION (provided by applicant): PHS Force coordination in grasping is severely impaired in individuals with certain neurological and musculoskeletal diseases. Basic understanding of the development of force coordination is essential for the rehabilitation and restoration of hand function in these individuals. The objective of the present proposal is to better understand the mechanisms underlying the spatial and temporal coordination of multiple grip forces during grasping. This objective will be pursued by examining involuntary corrective force responses to perturbations to stable force sharing patterns during five-digit grasps. A novel procedure will be introduced that elicits transient force changes in individual digits, disrupting the force sharing pattern. The specific aims of the proposal are to determine the effects of varying 1) force perturbation parameters (digit perturbed, direction of force) and 2) initial force sharing pattern on the involuntary corrective force responses developed to compensate for the perturbation. Our preliminary data suggests that involuntary corrective responses are involved. We will test that the corrective force responses will be dependent upon the function role of the perturbed digit in maintaining grasp stability.