Long Heidi, Ma-Wyatt Anna
School of Psychology, The University of Adelaide, North Terrace, Adelaide, Australia,
Exp Brain Res. 2014 Jun;232(6):1883-93. doi: 10.1007/s00221-014-3880-6. Epub 2014 Mar 6.
Goal-directed movements are commonly used to allow humans to interact with their environment. When making a goal-directed movement in a natural environment, there are many competing stimuli. It is therefore important to understand how making a goal-directed movement could be impacted by the need to divide attention between the movement and competing stimuli. We used a dual-task paradigm to investigate the sharing of attentional resources between a search task in central vision and a peripheral pointing task completed concurrently. Results suggest some degree of shared attentional resources between these two tasks with performance on both central and peripheral tasks degraded under dual-task conditions. Movement latency, but not movement time, was also affected by dual-task conditions. Altogether, the results suggest that there is a cost to reach performance if attention is engaged away from the movement goal. Interestingly, this cost is associated with movement planning rather than execution.
目标导向运动通常用于让人类与环境进行交互。在自然环境中进行目标导向运动时，存在许多相互竞争的刺激因素。因此，了解在运动和竞争刺激之间分配注意力的需求如何影响目标导向运动非常重要。我们使用了一种双任务范式来研究中央视觉搜索任务和同时完成的外周指向任务之间注意力资源的分配。结果表明，这两个任务之间存在一定程度的共享注意力资源，在双任务条件下，中央和外周任务的表现都会下降。双任务条件还会影响运动潜伏期，但不影响运动时间。总之，结果表明，如果注意力从运动目标上转移，达到最佳表现是有代价的。有趣的是，这种代价与运动规划而非执行有关。
