Schweitzer Richard, Rolfs Martin
Department of Psychology, Humboldt-Universität zu Berlin, Berlin, Germany.
Exzellenzcluster Science of Intelligence, Technische Universität Berlin, Berlin, Germany.
Sci Adv. 2021 Jul 23;7(30). doi: 10.1126/sciadv.abf2218. Print 2021 Jul.
Rapid eye movements (saccades) incessantly shift objects across the retina. To establish object correspondence, the visual system is thought to match surface features of objects across saccades. Here, we show that an object's intrasaccadic retinal trace-a signal previously considered unavailable to visual processing-facilitates this match making. Human observers made saccades to a cued target in a circular stimulus array. Using high-speed visual projection, we swiftly rotated this array during the eyes' flight, displaying continuous intrasaccadic target motion. Observers' saccades landed between the target and a distractor, prompting secondary saccades. Independently of the availability of object features, which we controlled tightly, target motion increased the rate and reduced the latency of gaze-correcting saccades to the initial presaccadic target, in particular when the target's stimulus features incidentally gave rise to efficient motion streaks. These results suggest that intrasaccadic visual information informs the establishment of object correspondence and jump-starts gaze correction.
快速眼动（扫视）不断地在视网膜上移动目标。为了建立目标对应关系，视觉系统被认为会在扫视过程中匹配目标的表面特征。在这里，我们表明，目标在扫视过程中的视网膜痕迹——一种以前被认为视觉处理无法利用的信号——有助于这种匹配。人类观察者在圆形刺激阵列中对提示目标进行扫视。利用高速视觉投影，我们在眼睛运动期间迅速旋转这个阵列，显示出连续的扫视目标运动。观察者的扫视落在目标和干扰物之间，从而引发二次扫视。与我们严格控制的目标特征的可用性无关，目标运动增加了对初始扫视前目标进行注视校正扫视的速率并减少了延迟，特别是当目标的刺激特征偶然产生有效的运动条纹时。这些结果表明，扫视过程中的视觉信息有助于建立目标对应关系并启动注视校正。
