The oculomotor system uses a sophisticated updating mechanism to adjust for large retinal displacements which occur with every saccade. Previous studies have shown that updating operates rapidly and starts before saccade is initiated. Here we used saccade adaptation to alter life-long expectations about how a saccade changes the location of an object on the retina. Participants made a sequence of one horizontal and one vertical saccade and ignored an irrelevant distractor. The time-course of oculomotor updating was estimated using saccade curvature of the vertical saccade, relative to the distractor. During the first saccade both saccade targets were shifted on 80% of trials, which induced saccade adaptation (Experiment 1). Critically, since the distractor was left stationary, successful saccade adaptation (e.g., saccade becoming shorter) meant that after the first saccade the distractor appeared in a different hemifield than without adaptation. After adaptation, second saccades curved away only from the newly learned distractor location starting at 80 ms after the first saccade. When on the minority of trials (20%) the targets were not shifted, saccades again first curved away from the newly learned (now empty) location, but then quickly switched to curving away from the life-long learned, visible location. When on some trials the distractor was removed during the first saccade, saccades curved away only from the newly learned (but empty) location (Experiment 2). The results show that updating of locations across saccades is not only fast, but is highly malleable, relying on recently learned sensorimotor contingencies.

动眼神经系统使用复杂的更新机制来调整每次扫视时发生的大视网膜位移。以前的研究表明，更新运行迅速，并在开始扫视之前开始。在这里，我们使用扫视适应来改变关于扫视如何改变物体在视网膜上的位置的终生期望。参与者进行了一个水平和一个垂直扫视的序列，并忽略了一个不相关的干扰因素。动眼神经更新的时间过程是使用垂直扫视相对于干扰物的扫视曲率来估计的。在第一次扫视期间，80% 的试验中两个扫视目标都发生了变化，这会引起扫视适应（实验 1）。至关重要的是，由于干扰物保持静止，成功的扫视适应（例如，扫视变得更短）意味着在第一次扫视之后，干扰物出现在与没有适应的不同的半场中。适应后，第二次扫视仅在第一次扫视后 80 毫秒开始远离新学习的干扰物位置。当少数试验 (20%) 目标没有移动时，扫视再次首先弯曲远离新学习的（现在是空的）位置，然后迅速切换到远离终身学习的可见位置。在某些试验中，在第一次扫视期间移除干扰物时，扫视仅从新学习的（但空的）位置弯曲（实验 2）。结果表明，跨眼跳位置的更新不仅速度快，而且具有高度的可塑性，依赖于最近学习的感觉运动突发事件。