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The time course of attention shifts following perturbation of upright stance

机译：注意的时间过程随直立姿势的变化而变化

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Recent work has revealed the specific time course of attention shifts associated with balance control in a seated model using a dual-task paradigm. This work highlighted an initial “automatic” and later “attention-demanding” phase of the evoked balance reaction. The objective of the present study was to determine if comparable influences would be observed for performance of a visuomotor tracking task when responding to perturbations of upright stability. Small-amplitude floor translations were applied in the forward or backward direction to evoke stabilizing postural reactions. Balance reactions were evoked with and without the concurrent performance of a visuomotor tracking task using the right hand. Results showed significant disruptions (pauses) in tracking that invariably occurred after onset of the earliest balance reaction measured in ankle muscles. On average, there was a delay of 345 ms between ankle-muscle activation (average onset 144 ms) and the pause in visuomotor tracking. The concurrent tracking led to modest change in later phases of the balance reaction, as measured by an increase in center-of-pressure excursions, but did not affect the earliest phase of the reaction. These results support the view that compensatory balance reactions, even those evoked by small perturbations, are characterized by an initial “automatic” phase and subsequent control that may be more dependent on cognitive resources.
机译：最近的工作揭示了在坐姿模型中使用双任务范式与平衡控制相关的注意力转移的特定时间过程。这项工作强调了诱发的平衡反应的最初的“自动”阶段和后来的“注意”阶段。本研究的目的是确定在应对立式稳定性的扰动时，是否会观察到对粘性运动追踪任务的表现产生可比的影响。在向前或向后方向应用小幅度的地板平移以引起稳定的姿势反应。在有和没有同时使用右手进行视觉运动追踪任务的情况下，都会引起平衡反应。结果显示，在追踪过程中出现了明显的中断（停顿），这总是发生在踝部肌肉中最早发生的平衡反应发生之后。平均而言，踝肌激活（平均发作144 ms）和运动追踪暂停之间存在345 ms的延迟。并发跟踪导致平衡反应后期的适度变化（通过压力中心偏移的增加来衡量），但并未影响反应的最早阶段。这些结果支持这样一种观点，即补偿性平衡反应，即使是由小扰动引起的平衡性反应，也具有初始的“自动”阶段和随后的控制（可能更多地依赖认知资源）的特征。

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