McSorley Eugene, Gilchrist Iain D, McCloy Rachel
School of Psychology and Clinical Language Sciences, University of Reading, Reading, RG6 6AL, UK.
School of Experimental Psychology, University of Bristol, Bristol, BS8 1TU, UK.
Exp Brain Res. 2019 Apr;237(4):1009-1018. doi: 10.1007/s00221-019-05481-7. Epub 2019 Feb 6.
Saccadic eye movements move the high-resolution fovea to point at regions of interest. Saccades can only be generated serially (i.e., one at a time). However, what remains unclear is the extent to which saccades are programmed in parallel (i.e., a series of such moments can be planned together) and how far ahead such planning occurs. In the current experiment, we investigate this issue with a saccade contingent preview paradigm. Participants were asked to execute saccadic eye movements in response to seven small circles presented on a screen. The extent to which participants were given prior information about target locations was varied on a trial-by-trial basis: participants were aware of the location of the next target only, the next three, five, or all seven targets. The addition of new targets to the display was made during the saccade to the next target in the sequence. The overall time taken to complete the sequence was decreased as more targets were available up to all seven targets. This was a result of a reduction in the number of saccades being executed and a reduction in their saccade latencies. Surprisingly, these results suggest that, when faced with a demand to saccade to a large number of target locations, saccade preparation about all target locations is carried out in parallel.
扫视眼动将高分辨率的中央凹移向感兴趣的区域。扫视只能串行产生（即一次一个）。然而，尚不清楚的是扫视在多大程度上是并行编程的（即一系列这样的时刻可以一起规划）以及这种规划提前到什么程度。在当前的实验中，我们使用扫视关联预览范式来研究这个问题。要求参与者对屏幕上呈现的七个小圆圈做出扫视眼动反应。参与者每次试验获得目标位置先验信息的程度各不相同：参与者仅知道下一个目标的位置、接下来的三个、五个或所有七个目标的位置。在扫视到序列中的下一个目标期间，向显示中添加新目标。随着多达所有七个目标的可用目标数量增加，完成序列所需的总时间减少。这是执行的扫视次数减少及其扫视潜伏期缩短的结果。令人惊讶的是，这些结果表明，当面临扫视到大量目标位置的需求时，对所有目标位置的扫视准备是并行进行的。
