The temporal and spatial constraints of saccade planning to double-step target displacements.
The temporal and spatial constraints of saccade planning to double-step target displacements.
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扫视规划对双步目标位移的时间和空间约束。
DOI：
10.1016/j.visres.2019.08.003
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发表时间：
2019
期刊：
影响因子：
1.8
通讯作者：
Joiner,WilsaanM
中科院分区：
文献类型：
--
作者：
Kelly,Shane;Zhou,Weiwei;Bansal,Sonia;Peterson,MatthewS;Joiner,WilsaanM
双步范式研究了运动系统必须快速调整以适应新目标位置时的计划和执行特征。研究已经提供了基于运动系统准备新的运动轨迹的可用持续时间（这里称为重新准备时间）的详细时间信息。然而，以前的工作在很大程度上研究了单个位移的大小，限制了运动规划和执行的时空理解。缺乏描述这种行为的时间过程中增加位移大小是真的眼跳，快速眼球运动，重定向中央凹。此外，在双步范式期间，主扫视常常不能准确地定位最终目标位置，并且次扫视将目标带到中央凹上。然而，也不知道该补偿如何与曝光持续时间和移动目标的位移同时修改。在这里，我们检查了相对较小（20°，30°和40°）和较大（60°和90°）的目标空间间隔将初始扫视方向改变到新目标位置所需的时间量。有趣的是，我们发现扫视方向和允许重新定向运动的时间量之间存在明确的关系;在分离期间，当大约60-140 ms可用于重新调整运动计划时，会发生中间扫视。此外，二次扫视的时间和跳跃大小的重新准备时间之间存在一致的关系，这表明并发运动校正计划取决于最终运动目标的暴露量。
The double-step paradigm investigates the characteristics of planning and execution when the motor system must rapidly adjust for a new goal location. Studies have provided detailed temporal information based on the duration available for the motor system to prepare a new movement trajectory (here referred to as re-preparation time). However, previous work has largely examined single displacement sizes, limiting the spatiotemporal understanding of movement planning and execution. The lack of a description of this behavioral timecourse across increasing displacement sizes is true for saccades, rapid eye movements that redirect the fovea. Furthermore, during the double-step paradigm, the primary saccade often fails to accurately foveate the final target location and a secondary saccade brings the target onto the fovea. However, it is also unknown how this compensation is concurrently modified with the exposure duration and displacement of the movement goal. Here, we examined the amount of time required to change the initial saccade direction to a new target location for relatively small (20°, 30°, and 40°) and large (60° and 90°) target spatial separations. Interestingly, we found a clear relationship between the saccade direction and the amount of time allowed to redirect the movement; across separations, intermediate saccades occurred when approximately 60–140 ms was available to readjust the movement plan. Additionally, there was a consistent relationship between the timing of the secondary saccade and the re-preparation time across jump sizes, suggesting that concurrent movement correction planning was dependent on the amount of exposure to the final movement goal.
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