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首页> 外文期刊>Journal of Neurophysiology >Proprioceptive and retinal afference modify postsaccadic ocular drift.
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Proprioceptive and retinal afference modify postsaccadic ocular drift.

机译：本体感受性和视网膜病变会改变术后眼球漂移。

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摘要

Drift of the eyes after saccades produces motion of images on the retina (retinal slip) that degrades visual acuity. In this study, we examined the contributions of proprioceptive and retinal afference to the suppression of postsaccadic drift induced by a unilateral ocular muscle paresis. Eye movements were recorded in three rhesus monkeys with a unilateral weakness of one vertical extraocular muscle before and after proprioceptive deafferentation of the paretic eye. Postsaccadic drift was examined in four visual states: monocular viewing with the normal eye (4-wk period); binocular viewing (2-wk period); binocular viewing with a disparity-reducing prism (2-wk period); and monocular viewing with the paretic eye (2-wk period). The muscle paresis produced vertical postsaccadic drift in the paretic eye, and this drift was suppressed in the binocular viewing condition even when the animals could not fuse. When the animals viewed binocularly with a disparity-reducing prism, the drift in the paretic eye was suppressed in two monkeys (with superior oblique pareses) but generally was enhanced in one animal (with a tenotomy of the inferior rectus). When drift movements were enhanced, they reduced the retinal disparity that was present at the end of the saccade. In the paretic-eye-viewing condition, postsaccadic drift was suppressed in the paretic eye and was induced in the normal eye. After deafferentation in the normal-eye-viewing state, there was a change in the vertical postsaccadic drift of the paretic eye. This change in drift was idiosyncratic and variably affected the amplitude and velocity of the postsaccadic drift movements of the paretic eye. Deafferentation of the paretic eye did not affect the postsaccadic drift of the normal eye nor did it impair visually mediated adaptation of postsaccadic drift. The results demonstrate several new findings concerning the roles of visual and proprioceptive afference in the control of postsaccadic drift: disconjugate adaptation of postsaccadic drift does not require binocular fusion; slow, postsaccadic drift movements that reduce retinal disparity but concurrently increase retinal slip can be induced in the binocular viewing state; postsaccadic drift is modified by proprioception from the extraocular muscles, but these modifications do not serve to minimize retinal slip or to correct errors in saccade amplitude; and visually mediated adaptation of postsaccadic drift does not require proprioceptive afference from the paretic eye.
机译：扫视后眼睛的漂移会在视网膜上产生图像运动（视网膜滑移），从而降低视力。在这项研究中，我们检查了本体感受性和视网膜病变在抑制单侧眼肌麻痹引起的结acc后漂移中的作用。记录了三只猕猴的视线运动，这些动物在对本体性眼睛的本体感受性脱除咖啡因之前和之后都具有一只垂直眼外肌的单侧无力。在四种视觉状态下检查了脚后跟漂移：正常眼（4周周期）单眼观看;双眼观察（2周周期）;用减少视差棱镜（2周周期）进行双目观察;并用麻雀眼（2周周期）单眼观看。肌肉麻痹会在视力眼中产生垂直的突听后漂移，即使在动物无法融合的情况下，在双目观察条件下这种漂移也会受到抑制。当用减少视差的棱镜双眼观察动物时，两只猴子（有上斜斜肌）抑制了雀眼的漂移，但通常有一只动物（有下直肌切开术）加剧了视线漂移。当漂移运动增强时，它们可以减小扫视结束时出现的视网膜视差。在视线旁观察条件下，角膜后漂移在视线旁眼中被抑制并且在正常眼中被诱发。在正常视线状态下进行脱除力后，稀有眼的垂直眼后跳动发生了变化。漂移的这种变化是特异的，并且会不同程度地影响视力眼的课后漂移运动的幅度和速度。视力减退并不会影响正常眼睛的脚后跟漂移，也不会损害视觉介导的脚后跟漂移的适应性。结果表明，关于视觉和本体感受性情绪在控制脚后跟漂移中的作用的一些新发现：脚后跟漂移的非共轭适应不需要双眼融合。在双眼观察状态下，可引起缓慢，急速的，导致视网膜差异的并发眼后漂移运动;眼后肌的本体感受可以改变声带后漂移，但是这些改变不能使视网膜滑移减至最小或矫正扫视幅度的误差。并且视觉调节的脚后跟漂移适应性不需要从视线旁感觉到本体感觉。

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