OCULOMOTOR LOCALIZATION RELIES ON A DAMPED REPRESENTATION OF SACCADIC EYE DISPLACEMENT IN HUMAN AND NONHUMAN-PRIMATES
OCULOMOTOR LOCALIZATION RELIES ON A DAMPED REPRESENTATION OF SACCADIC EYE DISPLACEMENT IN HUMAN AND NONHUMAN-PRIMATES
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DOI：
10.1017/s0952523800010671
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发表时间：
1992-09-01
影响因子：
1.9
通讯作者：
SCHLAGREY, M
中科院分区：
文献类型：
--
作者：
DASSONVILLE, P;SCHLAG, J;SCHLAGREY, M
长期以来，人们一直认为眼球运动系统依赖于眼睛位移或位置的准确表征，以成功地调和静止目标的视网膜不稳定性（由眼睛的运动引起）与其相应的空间不变性。这与知觉定位形成鲜明对比，知觉定位依赖于眼睛位移的缓慢表征，只能部分补偿眼跳运动引起的视网膜位移。然而，最近的研究开始对动眼肌系统拥有优于感知系统的眼位移信号的观点提出质疑。为了验证这一点，五个人和一只猴子（Macaca nemestrina）作为研究对象进行了眼动定位能力的研究。受试者被要求尽可能准确地对三个连续视觉刺激的位置进行眼球运动。第三个刺激（持续时间2毫秒）的呈现时间是在受试者从第一个刺激到第二个刺激的扫视之前、期间或之后。每个被试（人类和非人类）的定位错误都与眼动系统只能获得眼球位移的阻尼表征这一假设相一致——这种表征类似于在感知定位研究中发现的。
The oculomotor system has long been thought to rely on an accurate representation of eye displacement or position in a successful attempt to reconcile a stationary target's retinal instability (caused by motion of the eyes) with its corresponding spatial invariance. This is in stark contrast to perceptual localization, which has been shown to rely on a sluggish representation of eye displacement, achieving only partial compensation for the retinal displacement caused by saccadic eye movements. Recent studies, however, have begun to cast doubt on the belief that the oculomotor system posseses a signal of eye displacement superior to that of the perceptual system. To verify this, five humans and one monkey (Macaca nemestrina) served as subjects in this study of oculomotor localization abilities. Subjects were instructed to make eye movements, as accurately as possible, to the locations of three successive visual stimuli. Presentation of the third stimulus (2-ms duration) was timed so that it fell before, during, or after the subject's saccade from the first stimulus to the second. Localization errors in each subject (human and nonhuman) were consistent with the hypothesis that the oculomotor system has access to only a damped representation of eye displacement - a representation similar to that found in perceptual localization studies.