Changes of visual vertical perception: A long-term sign of unilateral and bilateral vestibular loss
Changes of visual vertical perception: A long-term sign of unilateral and bilateral vestibular loss
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DOI：
10.1016/j.neuropsychologia.2007.02.004
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发表时间：
2007-01-01
期刊：
影响因子：
2.6
通讯作者：
Borel, Liliane
中科院分区：
文献类型：
--
作者：
Lopez, Christophe;Lacour, Michel;Borel, Liliane
本研究探讨了在动态和静态视觉线索存在的情况下，单侧和双侧前庭传入阻滞如何改变视觉垂直知觉。我们测试了40名梅尼埃的患者之前和之后（从1周到1年）的治疗性单侧前庭神经切断术（UVN），和4名患者双侧前庭损失。将患者的表现与24名健康受试者进行比较。本文研究了在不同角速度下，视动刺激对动态视觉垂直（DVV）的影响。静态视觉垂直（SVV）记录与一个固定的视觉模式。在UVN后的急性期，梅尼埃的患者表现出严重的损害DVV，这是向病变侧倾斜，无论视动刺激的方向。此外，SVV系统性地向病变侧倾斜。视动诱导的垂直倾斜在新SVV周围不对称组织，无论术后时间如何，对侧刺激均显著减少，同侧刺激无变化。术后1年SVV恢复正常。对于双侧前庭丧失的患者，视动诱发的视觉垂直倾斜急剧增加，并对称地组织在与重力垂直对齐的未修改的SVV周围。本研究首次描述了单侧前庭丧失后DVV感知的恢复时间过程。数据显示，长期损害的DVV知觉后，单侧前庭损失，这表明一个不对称的视觉信息处理和永久增加的重量动态视觉线索后，双侧前庭损失。(c)2007爱思唯尔有限公司版权所有。
This study investigates how unilateral and bilateral vestibular deafferentation modifies visual vertical perception in the presence of dynamic and static visual cues. We tested 40 Meniere's patients before and after (from 1 week to 1 year) a curative unilateral vestibular neurotomy (UVN), and 4 patients with bilateral vestibular loss. Patients' performances were compared with those of 24 healthy subjects. The perception of the dynamic visual vertical (DVV) was investigated during optokinetic stimulations around the line of sight at various angular velocities. The static visual vertical (SVV) was recorded with a stationary visual pattern. In the acute stage after UVN, Meniere's patients exhibited drastic impairment of DVV, which was tilted towards the lesioned side, whatever the direction of the optokinetic stimulation. In addition, the SVV was systematically tilted towards the lesioned side. The optokinetic-induced tilt of the vertical was asymmetrically organized around the new SVV with a significant decrease for contralesional stimulations and no change for ipsilesional stimulations, whatever the postoperative time. The SVV regained normal values 1 year postoperatively. For the patients with bilateral vestibular loss, the optokinetic-induced tilt of the visual vertical was drastically increased and symmetrically organized around an unmodified SVV aligned with the gravitational vertical. This study constitutes the first description of the recovery time-course of DVV perception after unilateral vestibular loss. Data reveal a long-term impairment of the DVV perception after unilateral vestibular loss, suggesting an asymmetrical processing of visual information and a permanent increased weight of dynamic visual cues after bilateral vestibular loss. (c) 2007 Elsevier Ltd. All rights reserved.