Influence of auditory precuing on automatic postural responses
Influence of auditory precuing on automatic postural responses
复制标题
听觉预提示对自动姿势反应的影响
DOI：
10.1007/bf00228104
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发表时间：
1996
影响因子：
2
通讯作者：
M. Woollacott
中科院分区：
文献类型：
--
作者：
J. W. McChesney;H. Sveistrup;M. Woollacott
进行了一项实验以确定听觉预提示对姿势控制的影响。具体来说，确定了警告信号对腓肠肌 (G) 和胫骨前肌 (TA) 肌肉起始潜伏期的影响。向站在可移动平台上的受试者发出 50 毫秒的声音，然后对站立平衡进行 500 毫秒的扰动。扰动是由支撑表面的向前或向后平移（30 厘米/秒时 3 厘米）产生的。记录 G 肌和 TA 肌的单侧肌电活动。在第一个系列试验（A 系列）中，比较了使用非定向特异性预提示、无效预提示和无预提示进行扰动后的肌肉起始潜伏期。在第二系列试验（B系列）中，比较了使用定向特异性预提示、无效预提示和无预提示扰动后的肌肉起始潜伏期。在 A 系列中，在向前和向后平台扰动期间，在非定向特定预兆之后，平均肌肉起始潜伏期降低；分别为 TA 6%（91±9 ms 至 86±9 ms）和 G 7%（93±6 ms 至 87±5 ms）。在 B 系列期间，定向特异性预提示后 TA 和 G 肌起始潜伏期分别降低了 10.4%（92±12 ms 至 82±6ms）和 9.8%（92±9ms 至 83±6ms）。预兆类型之间没有显着差异。因此，对即将到来的平衡扰动的先验知识减少了姿势肌肉起始潜伏时间。此外，特定先验知识以与非特定先验知识相同的方式减少肌肉起始潜伏时间。
An experiment was conducted to determine the influence of auditory precuing on posture control. Specifically, the influence of a warning signal on the onset latencies of the gastrocnemius (G) and tibialis anterior (TA) muscles was determined. An audible 50-ms tone was presented to subjects standing on a moveable platform and preceded a perturbation to standing balance by 500 ms. The perturbations were produced by an anterior or posterior translation (3 cm at 30 cm/s) of the support surface. Unilateral electromyographic activity was recorded from G and TA muscles. In the first series of trials (series A), the muscle onset latencies following perturbations with a nondirectionally specific precue, an invalid precue, and no precue were compared. In the second series of trials (series B), muscle onset latencies following perturbations with a directionally specific precue, invalid precue, and no precue perturbations were compared. In series A, mean muscle onset latencies decreased following nondirectionally specific precues during forward and backward platform perturbations; respectively, TA 6% (91±9 ms to 86±9 ms) and G 7% (93±6 ms to 87±5 ms). During series B, the TA and G muscle onset latencies decreased following directionally specific precues by 10.4% (92±12 ms to 82±6ms) and 9.8% (92±9ms to 83±6ms), respectively. There were no significant differences between the types of precues. Thus, prior knowledge of a forthcoming balance perturbation reduces postural muscle onset latency times. In addition, specific prior knowledge reduces muscle onset latency time in the same manner as does nonspecific prior knowledge.
影响因子：
2.5
作者：
HORAK, FB;NASHNER, LM
通讯作者：
NASHNER, LM