Deubel H
Max-Planck-Institut für Psychologische Forschung, München, Germany.
Vision Res. 1995 Dec;35(23-24):3529-40. doi: 10.1016/0042-6989(95)00058-m.
Adaptive reduction of the gain of the saccadic system was induced by means of two basically different paradigms. In the first approach the subjects had to follow a step-wise moving target. During each follow-up saccade the target was systematically displaced by 25% of the initial step, into the opposite direction of the saccade. In the second approach the subjects scanned a display of six small items. During each scanning saccade the whole display was displaced by 25% into the opposite direction of the saccade. Both conditions lead to fast and consistent saccadic gain reductions. However, adaptation with the stepping target did not transfer to the saccades in the scanning situation, nor to delayed saccades in an overlap paradigm, nor to memory-guided saccades. Conversely, when saccades were adapted in the scanning situation, induced gain changes transferred to overlap and memory-guided saccades, but not to saccades following steps of a single target. The results suggest that two separate and largely independent mechanisms are involved in the generation of reactive, stimulus-triggered and volitional, internally generated saccades, respectively. Both types of responses can be selectively adapted.
通过两种基本不同的范式诱导眼跳系统增益的适应性降低。在第一种方法中，受试者必须跟踪一个逐步移动的目标。在每次跟踪眼跳期间，目标会系统地向眼跳相反方向移动初始步长的25%。在第二种方法中，受试者扫描一个由六个小项目组成的显示屏。在每次扫描眼跳期间，整个显示屏会向眼跳相反方向移动25%。两种情况都会导致快速且一致的眼跳增益降低。然而，对步进目标的适应性并没有转移到扫描情况下的眼跳，也没有转移到重叠范式中的延迟眼跳，也没有转移到记忆引导的眼跳。相反，当在扫描情况下使眼跳适应时，诱导的增益变化会转移到重叠和记忆引导的眼跳，但不会转移到跟踪单个目标步长后的眼跳。结果表明，分别有两种独立且基本独立的机制参与了反应性、刺激触发的眼跳和自主性、内部产生的眼跳的产生。两种类型的反应都可以被选择性地适应。
