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首页> 外文期刊>Journal of Neurophysiology >Modulation of gaze-evoked blinks depends primarily on extraretinal factors.
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Modulation of gaze-evoked blinks depends primarily on extraretinal factors.

机译：凝视诱发眨眼的调节主要取决于视网膜外因素。

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摘要

Gaze-evoked blinks are contractions of the orbicularis oculi (OO)-the lid closing muscle-occurring during rapid movements of the head and eyes and result from a common drive to the gaze and blink motor systems. However, blinks occurring during shifts of gaze are often suppressed when the gaze shift is made to an important visual stimulus, suggesting that the visual system can modulate the occurrence of these blinks. In head-stabilized, human subjects, we tested the hypothesis that the presence of a visual stimulus was sufficient, but not necessary, to modulate OO EMG (OOemg) activity during saccadic eye movements. Rapid, reorienting movements of the eyes (saccades) were made to visual targets that remained illuminated (visually guided trials) or were briefly flashed (memory-guided trials) at different amplitudes along the horizontal meridian. We measured OOemg activity and found that the magnitude and probability of OOemg activity occurrence was reduced when a saccade was made to the memory of the spatial location as well as to the actual visual stimulus. The reduced OOemg activity occurred only when the location of the target was previously cued. OOemg activity occurred reliably with spontaneous saccades that were made to locations with no explicit visual stimulus, generally, back to the fixation location. Thus the modulation of gaze-evoked OOemg activity does not depend on the presence of visual information per se, but rather, results from an extraretinal signal.
机译：凝视引起的眨眼是眼球轮回（OO）的收缩-眼和眼的快速运动过程中发生的眼睑闭合肌肉，是由共同驱动凝视和眨眼运动系统导致的。但是，当对重要的视觉刺激进行视线移动时，通常会抑制在视线移动期间发生的眨眼，这表明视觉系统可以调节这些眨眼的发生。在头部稳定的人类受试者中，我们测试了以下假设：视觉刺激的存在足以（但不是必须）在眼跳运动期间调节OO EMG（OOemg）活动。使眼睛的快速（定向）运动（扫视）沿着水平子午线以不同幅度保持不变的视觉目标（视觉指导试验）或短暂闪烁（记忆指导试验）。我们测量了OOemg活动，发现当对空间位置的记忆以及实际的视觉刺激进行扫视时，OOemg活动发生的幅度和可能性降低了。仅当预先确定了靶标的位置时，OOemg活性才会降低。在没有明显视觉刺激的情况下，自发扫视通常可靠地发生OOemg活动，回到固定位置。因此，凝视引起的OOemg活性的调节并不取决于视觉信息本身的存在，而是由视网膜外信号引起的。

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