Israël I
Laboratoire de Physiologie Neurosensorielle, CNRS, Paris, France.
Exp Brain Res. 1992;90(1):221-4. doi: 10.1007/BF00229275.
In order to find out whether extraretinal (oculomotor, internal) input suffices to provide the oculomotor system with the information necessary for saccadic control, two subjects were asked to make memory-guided saccades in complete darkness, after three different location acquisition conditions. These conditions were visually-guided saccades (SA), providing retinal (external) and extraretinal input, visual peripheral target presentation during central target fixation (FI) (external input only), and smooth pursuit (PU) (internal input only). Either 2 or 12 s (delay) after locating the target, the subjects had to make a memory-guided saccade toward it in complete darkness. The results show that whereas these memory-guided saccades were quite accurate for trials with preceding external input, this was not the case with acquisition through internal input alone. Moreover, the accuracy of memory-guided saccades decreased when the delay increased from 2 to 12 s for both conditions with retinal input, whereas the accuracy increased for the one condition without retinal input, i.e., the smooth pursuit location acquisition. Furthermore, when both retinal and oculomotor inputs were provided, better accuracy of the memory-guided saccades was observed than with single input.
为了弄清楚视网膜外（动眼神经、内部）输入是否足以向动眼系统提供眼跳控制所需的信息，让两名受试者在三种不同的位置获取条件后，在完全黑暗中进行记忆引导的眼跳。这些条件分别是视觉引导的眼跳（SA），提供视网膜（外部）和视网膜外输入；在中央目标固定期间进行视觉周边目标呈现（FI）（仅外部输入）；以及平稳跟踪（PU）（仅内部输入）。在定位目标后2秒或12秒（延迟），受试者必须在完全黑暗中向目标进行记忆引导的眼跳。结果表明，虽然这些记忆引导的眼跳在有先前外部输入的试验中相当准确，但仅通过内部输入进行获取时情况并非如此。此外，对于两种有视网膜输入的情况，当延迟从2秒增加到12秒时，记忆引导眼跳的准确性降低，而对于一种没有视网膜输入的情况，即平稳跟踪位置获取，准确性则增加。此外，当同时提供视网膜和动眼神经输入时，观察到记忆引导眼跳的准确性比单一输入时更好。
