Department of Applied Mechanics, Indian Institute of Technology Madras, Chennai,India.
Department of Biomedical Engineering, Saveetha Engineering College, Chennai,India.
Motor Control. 2022 Jan 1;26(1):1-14. doi: 10.1123/mc.2020-0031. Epub 2021 Dec 10.
A reduction in fingertip forces during a visually occluded isometric task is called unintentional drift. In this study, unintentional drift was studied for two conditions, with and without "epilogue." We define epilogue as the posttrial visual feedback in which the outcome of the just-concluded trial is shown before the start of the next trial. For this study, 14 healthy participants were recruited and were instructed to produce fingertip forces to match a target line at 15% maximum voluntary contraction. The results showed a significant reduction in unintentional drift in the epilogue condition. This reduction is probably due to the difference in the shift in λ, the threshold of the tonic stretch reflex, the hypothetical control variable that the central controller can set.
在视觉遮挡的等长任务中，指尖力的减少被称为无意识漂移。在这项研究中，研究了两种条件下的无意识漂移，一种是有“尾声”，另一种是没有。我们将尾声定义为试验后视觉反馈，其中在开始下一次试验之前显示刚刚结束的试验的结果。在这项研究中，招募了 14 名健康参与者，并指导他们产生指尖力以匹配 15%最大自主收缩的目标线。结果表明，在尾声条件下，无意识漂移显著减少。这种减少可能是由于假设的中央控制器可以设置的控制变量——紧张性牵张反射的阈值 λ 的变化不同所致。
