Institute for Experimental Psychology, Heinrich Heine University Düsseldorf, Germany.
Proc Biol Sci. 2023 Mar 8;290(1994):20222566. doi: 10.1098/rspb.2022.2566. Epub 2023 Mar 1.
How does the brain maintain an accurate visual representation of external space? Movement errors following saccade execution provide sufficient information to recalibrate motor and visual space. Here, we asked whether spatial information for vision and saccades is processed in shared or in separate resources. We used saccade adaptation to modify both, saccade amplitudes and visual mislocalization. After saccade adaptation was induced, we compared participants' saccadic and perceptual localization before and after we inserted 'no error' trials. In these trials, we clamped the post-saccadic error online to the predicted endpoints of saccades. In separate experiments, we either annulled the retinal or the prediction error. We also varied the number of 'no error' trials across conditions. In all conditions, we found that saccade adaptation remained undisturbed by the insertion of 'no error' trials. However, mislocalization decreased as a function of the number of trials in which zero retinal error was displayed. When the prediction error was clamped to zero, no mislocalization was observed at all. The results demonstrate the post-saccadic error is used separately to recalibrate visual and saccadic space.
大脑如何保持对外界空间的精确视觉表象？眼跳执行后的运动误差提供了足够的信息来重新校准运动和视觉空间。在这里，我们想知道视觉和眼跳的空间信息是在共享资源中还是在单独的资源中处理的。我们使用眼跳适应来同时修改眼跳幅度和视觉定位错误。在诱导眼跳适应后，我们比较了参与者在插入“无误差”试验前后的眼跳和知觉定位。在这些试验中，我们在线将眼跳后的误差钳制到眼跳的预测终点。在单独的实验中，我们消除了视网膜或预测误差中的一个。我们还在不同条件下改变了“无误差”试验的数量。在所有条件下，我们发现插入“无误差”试验并没有干扰眼跳适应。然而，定位错误随着显示零视网膜误差的试验数量的增加而减少。当预测误差被钳制为零时，根本没有观察到定位错误。结果表明，眼跳后误差被单独用于重新校准视觉和眼跳空间。
