Department of Experimental and Applied Psychology, Vrije Universiteit, Amsterdam, The Netherlands.
School of Psychology, University of Nottingham, Nottingham, UK.
Sci Rep. 2018 Jan 18;8(1):1072. doi: 10.1038/s41598-017-18779-9.
Each time we make an eye movement, positions of objects on the retina change. In order to keep track of relevant objects their positions have to be updated. The situation becomes even more complex if the object is no longer present in the world and has to be held in memory. In the present study, we used saccadic curvature to investigate the time-course of updating a memorized location across saccades. Previous studies have shown that a memorized location competes with a saccade target for selection on the oculomotor map, which leads to saccades curving away from it. In our study participants performed a sequence of two saccades while keeping a location in memory. The trajectory of the second saccade was used to measure when the memorized location was updated after the first saccade. The results showed that the memorized location was rapidly updated with the eyes curving away from its spatial coordinates within 130 ms after the first eye movement. The time-course of updating was comparable to the updating of an exogenously attended location, and depended on how well the location was memorized.
每次我们进行眼球运动时，视网膜上物体的位置都会发生变化。为了跟踪相关物体，必须更新它们的位置。如果物体不再存在于现实世界中，而必须在记忆中保留，那么情况就会变得更加复杂。在本研究中，我们使用眼跳曲率来研究在眼跳过程中记忆位置的更新时间过程。先前的研究表明，在眼动图上，记忆位置与眼跳目标竞争选择，导致眼跳偏离它。在我们的研究中，参与者在记忆中保持一个位置的同时执行了两个眼跳的序列。第二个眼跳的轨迹用于测量第一个眼跳后记忆位置何时更新。结果表明，在第一个眼动后 130 毫秒内，记忆位置会迅速更新，眼睛会从其空间坐标处弯曲。更新的时间过程与对外源性注意位置的更新相当，并且取决于记忆位置的记忆程度。
