Jürgens R, Becker W, Kornhuber H H
Biol Cybern. 1981;39(2):87-96. doi: 10.1007/BF00336734.
The present report considers goal directed human saccadic eye movements. It addresses the question how a given perceived target excentricity is transformed into the innervation pattern that creates the saccade to the target. More specifically, it investigates whether this pattern is an appropriately selected preprogram or whether it is continuously controlled by a local feedback loop that compares a non-visual eye position signal to the perceived target excentricity (a visual signal would be too slow). To this end, the relation between the accuracy of saccades aimed at a given target and their velocity and duration was examined. Duration and velocity were found to vary by as much as 60% while the amplitude showed no related variation and had an almost constant accuracy of about 90%. By administrating diazepam, the variabiity of saccade duration and velocity could be further increased, but still the amplitude remained almost constant. These results favour the hypothesis that saccadic innervation is controlled by a local feedback loop.
本报告探讨了目标导向的人类眼球快速跳动。它解决了一个问题，即给定的感知目标偏心度是如何转化为产生指向目标的扫视的神经支配模式的。更具体地说，它研究这种模式是一个经过适当选择的预编程，还是由一个局部反馈回路持续控制，该回路将非视觉眼位信号与感知到的目标偏心度进行比较（视觉信号太慢）。为此，研究了针对给定目标的扫视准确性与其速度和持续时间之间的关系。结果发现，持续时间和速度变化高达60%，而幅度没有相关变化，并且具有约90%的几乎恒定的准确性。通过给予地西泮，扫视持续时间和速度的变异性可以进一步增加，但幅度仍然几乎保持不变。这些结果支持扫视神经支配由局部反馈回路控制的假设。
