Ilg U J, Hoffmann K P
Allgemeine Zoologie und Neurobiologie, Ruhr-Universität-Bochum, Germany.
Vision Res. 1993 Jan;33(2):211-20. doi: 10.1016/0042-6989(93)90159-t.
Although the retinal image is displaced by each saccade performed we do not perceive the visual environment moving concordant with the saccades. In this study experiments were designed in which additional movement of most of the visual scene was applied during saccades. The subjects perceived the intrasaccadic movement after the saccade. The perceived speed of this movement was decreased and the threshold amplitude was increased compared to perception during fixation. The intrasaccadic movement perception was based on a novel aftereffect of motion perception. The velocity of retinal slip did not affect the threshold. If the retinal slip speed during saccades was temporally reduced by an intrasaccadic movement parallel to the saccade, the threshold amplitude was identical to the threshold amplitude obtained by intrasaccadic movement opposite to the saccade increasing retinal slip speed. Horizontal intrasaccadic movements were detected at lower thresholds than vertical movements independent of saccade direction. In addition, the thresholds were not effected by the saccade amplitude suggesting that neither speed, duration, nor direction of eye movement related retinal slip affects the amount of suppression. Our results suggest that saccadic suppression is related to delayed central processing of retinal information during saccades. This processing does not involve saccade parameters such as direction and amplitude.
尽管每次眼跳都会使视网膜图像发生位移，但我们并不会感觉到视觉环境随着眼跳而同步移动。在本研究中，设计了一些实验，在眼跳过程中对大部分视觉场景施加额外的运动。受试者在眼跳后察觉到了眼跳期间的运动。与注视期间的感知相比，这种运动的感知速度降低，阈值幅度增加。眼跳期间的运动感知基于一种新的运动感知后效。视网膜滑动速度不影响阈值。如果眼跳期间的视网膜滑动速度通过与眼跳平行的眼跳期间运动在时间上降低，阈值幅度与通过与眼跳相反的眼跳期间运动增加视网膜滑动速度所获得的阈值幅度相同。水平眼跳期间的运动比垂直运动在更低的阈值下被检测到，且与眼跳方向无关。此外，阈值不受眼跳幅度的影响，这表明与眼动相关的视网膜滑动的速度、持续时间或方向均不影响抑制量。我们的结果表明，眼跳抑制与眼跳期间视网膜信息的中枢处理延迟有关。这种处理不涉及眼跳参数，如方向和幅度。
