Anticipatory vibrotactile cueing facilitates grip force adjustment during perturbative loading
Anticipatory vibrotactile cueing facilitates grip force adjustment during perturbative loading
复制标题
预期振动触觉提示有助于在扰动负载期间调节握力
DOI：
10.1109/toh.2016.2526613
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发表时间：
2016
影响因子：
2.9
通讯作者：
and Vincent Hayward
中科院分区：
文献类型：
--
作者：
Shogo Okamoto;Michael Wiertlewski;and Vincent Hayward
当感知到对物体的外部干扰时，施加到拇指和食指之间的物体的握力会自动且无意识地调整。通常，此调整会在大约 100 毫秒内发生。在这里，我们研究了扰动力之前的预期振动触觉线索的影响，中枢神经系统可以利用它来快速重新稳定握力。我们要求参与者用拇指和食指握住并握住仪器驱动的手柄。在计算机控制下，手柄可以突然从静态抓握处拉开，并可以独立地向抓握的手指提供振动。纠正运动动作的平均潜伏期为 139 毫秒。当在施加牵引力之前 50 毫秒施加振动触觉刺激时，潜伏期缩短至 117 毫秒，而单独对振动触觉刺激的意识反应的平均潜伏期为 229 毫秒。这表明振动触觉刺激可以影响反射样动作。我们还使用一组具有不同上升率的扰动负载检查了预期线索的影响。正如预期的那样，在中等负载下观察到抓握力调节的促进。相比之下，预期线索对快速负载的影响并不显着，快速负载会在 60-80 毫秒内引发调整，这接近人类握力调整的最小延迟。了解预期线索对人类反应性握力的促进作用可以帮助开发人机界面以增强人类行为。
Grip force applied to an object held between the thumb and index finger is automatically and unconsciously adjusted upon perception of an external disturbance to the object. Typically, this adjustment occurs within approximately 100 ms. Here, we investigated the effect of anticipatory vibrotactile cues prior to a perturbative force, which the central nervous system may use for rapid grip re-stabilization. We asked participants to grip and hold an instrumented, actuated handle between the thumb and index finger. Under computer control, the handle could suddenly be pulled away from a static grip and could independently provide vibration to the gripping fingers. The mean latency of corrective motor action was 139 ms. When vibrotactile stimulation was applied 50 ms before application of tractive force, the latency was reduced to 117 ms, whereas the mean latency of the conscious response to vibrotactile stimuli alone was 229 ms. This suggests that vibrotactile stimulation can influence reflex-like actions. We also examined the effects of anticipatory cues using a set of perturbative loads with different rising rates. As expected, facilitation of grip force adjustment was observed for moderate loads. In contrast, anticipatory cues had an insignificant effect on rapid loads that evoked an adjustment within 60-80 ms, which approaches the minimum latency of human grip adjustment. Understanding the facilitative effects of anticipatory cues on human reactive grip can aid the development of human-machine interfaces to enhance human behavior.