Kapoula Z, Eggert T, Bucci M P
Laboratoire de Physiologie de la Perception et de I'Action, UMR 9950, CNRS-Collège de France, Paris.
Vision Res. 1996 Sep;36(17):2735-45. doi: 10.1016/0042-6989(96)00006-5.
Conjugate post-saccadic eye drift can be induced in normal humans if a visual pattern is made to drift after every saccade. This study examines the ability of normal humans to create disconjugate vertical post-saccadic drift. Identical fuseable patterns were presented dichoptically, one to each eye. At the end of each vertical saccade one pattern drifted up and the other down, by 5% of the saccade amplitude. Five subjects were trained for 2-3 hr. Eye movements were recorded with eye coils. Normal vertical saccades along the midline were remarkably conjugate and post-saccadic drift was minimal. Training produced only small disconjugate post-saccadic drift (0.14 deg) but substantial saccade amplitude disconjugacy (0.70 deg). For several subjects, the induced disconjugacies persisted even for saccades in the dark indicating that adaptive changes occurred in the binocular coordination of vertical saccades. Apparently vertical disparate post-saccadic retinal slip is not sufficient to stimulate significantly the saccade pulse-step matching mechanism which is believed to control post-saccadic eye drift. The changes we observed aimed to reduce position disparity and not retinal slip in each eye.
如果在每次扫视后让视觉模式漂移，正常人类中可诱发共轭扫视后眼漂移。本研究考察正常人类产生非共轭垂直扫视后漂移的能力。将相同的可融合模式以双眼分视的方式呈现给每只眼睛。在每次垂直扫视结束时，一个模式向上漂移，另一个向下漂移，漂移幅度为扫视幅度的5%。对5名受试者进行了2至3小时的训练。用眼线圈记录眼动。沿中线的正常垂直扫视显著共轭，扫视后漂移最小。训练仅产生了小的非共轭扫视后漂移（0.14度），但扫视幅度的非共轭性显著（0.70度）。对于几名受试者，诱导的非共轭性甚至在黑暗中的扫视中也持续存在，这表明垂直扫视的双眼协调发生了适应性变化。显然，垂直的扫视后视网膜视差不足以显著刺激被认为控制扫视后眼漂移的扫视脉冲-步长匹配机制。我们观察到的变化旨在减少每只眼中的位置视差而非视网膜视差。
