Department of Experimental and Applied Psychology, Vrije Universiteit, Amsterdam, The Netherlands.
Department of Human Movement Sciences, Vrije Universiteit, Amsterdam, The Netherlands.
Sci Rep. 2018 Oct 24;8(1):15709. doi: 10.1038/s41598-018-34120-4.
When a distractor is presented in close spatial proximity to a target, a saccade tends to land in between the two objects rather than on the target. This robust phenomenon (also referred to as the global effect) is thought to reflect unresolved competition between target and distractor. It is unclear whether this landing bias persists across saccades since a saccade displaces the retinotopic representations of target and distractor. In the present study participants made successive saccades towards two saccadic targets which were presented simultaneously with an irrelevant distractor in close proximity to the second saccade target. The second saccade was either visually-guided or memory-guided. For the memory-guided trials, the second saccade showed a landing bias towards the location of the distractor, despite the disappearance of the distractor after the first saccade. In contrast, for the visually-guided trials, the bias was corrected and the landing bias was eliminated, even for saccades with the shortest intersaccadic intervals. This suggests that the biased saccade plan was remapped across the first saccade. Therefore, we conclude that the target-distractor competition was not resolved across a saccade, but can be resolved based on visual information that is available after a saccade.
当干扰物与目标在近距离呈现时，眼跳往往会落在两者之间而不是目标上。这种强大的现象（也称为全局效应）被认为反映了目标和干扰物之间未解决的竞争。目前还不清楚这种着陆偏差是否会持续存在于眼跳中，因为眼跳会使目标和干扰物的视网膜代表发生位移。在本研究中，参与者连续向两个眼跳目标进行眼跳，同时在第二个眼跳目标附近呈现一个不相关的干扰物。第二个眼跳可以是视觉引导的，也可以是记忆引导的。对于记忆引导的试验，尽管在第一个眼跳之后干扰物消失了，但第二个眼跳仍然偏向于干扰物的位置。相比之下，对于视觉引导的试验，即使在眼跳间隔最短的情况下，偏差也得到了纠正，着陆偏差也被消除了。这表明，有偏差的眼跳计划在第一次眼跳中被重新映射。因此，我们得出结论，目标-干扰物竞争并没有在眼跳中得到解决，但可以基于眼跳后可用的视觉信息得到解决。
