A VEP measure of the binocular fusion of horizontal and vertical disparities.
A VEP measure of the binocular fusion of horizontal and vertical disparities.
复制标题
水平和垂直视差的双眼融合的 VEP 测量。
DOI：
10.1167/iovs.04-0954
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
Norcia,AnthonyM
中科院分区：
文献类型：
--
作者：
Hale,Julia;Harrad,RichardA;McKee,SuzanneP;Pettet,MarkW;Norcia,AnthonyM
目的。由于眼眶的侧向分离，两只眼睛的视网膜图像不同。这些差异通过感觉和运动融合机制调和成一个单一的图像。本研究从电生理学角度论证了正常水平和垂直融合过程对单眼位置信号处理的影响。在16名健康成人中记录vep对单眼呈现的游标起跳偏移目标的反应。游标偏移量在2hz时出现和消失，并被引入垂直（水平偏移）或水平（垂直偏移）方向的条形目标。偏移量的大小在0.5到10弧分的范围内变化。在单眼观看条件下和在另一只眼睛面前有两个不同的静态目标时，VEP振幅作为动态偏移量大小的函数进行测量。其中一个静态目标与动态测试相匹配，只是它没有游标偏移。另一个静态目标，即静态基座，与动态测试相匹配，但包含一组静态游标偏移，其位置与呈现给另一只眼睛的动态偏移的位置相对应。在单目观察条件下，VEP振幅是游标偏移量的单调递增函数。在另一只眼睛中添加无偏移的静态目标导致振幅增加的VEP反应。添加带有游标偏移的静态目标导致VEP振幅在水平和垂直差异上的下降。正常的融合过程导致单一的视觉方向。为了获得单一的视觉方向，视觉系统必须合成不同于单目组件的双眼视觉方向。其中一个条件（带有偏移的静态基座）会产生双目视觉方向偏移，从而降低游标偏移的外观，并降低水平和垂直差异的VEP振幅。这种特征诱发反应标记物是一种很有前途的工具，可以客观地测量斜视患者的双眼融合。
purpose. Because of the lateral separation of the orbits, the retinal images differ in the two eyes. These differences are reconciled into a single image through sensory and motor fusional mechanisms. This study demonstrates electrophysiologically the effects that normal horizontal and vertical fusional processes have on the processing of monocular position signals.methods. VEPs were recorded in 16 healthy adults in response to a vernier onset–offset target presented to one eye. The vernier offsets appeared and disappeared at 2 Hz and were introduced into bar targets that were oriented either vertically (horizontal offsets) or horizontally (vertical offsets). The magnitude of the offsets was varied over the range of 0.5 to 10 arc min. VEP amplitude was measured as a function of the size of the dynamic offset under monocular viewing conditions and in the presence of two different static targets presented to the other eye. One of the static targets matched the dynamic test, except that it had no vernier offsets. The other static target, the static pedestal, matched the dynamic test, but contained a set of static vernier offsets in locations corresponding to the locations of the dynamic offsets presented to the other eye.results. VEP amplitude was a monotonically increasing function of vernier offset size under monocular viewing conditions. The addition of the static target without offsets in the other eye resulted in an increased amplitude VEP response. The addition of the static target with vernier offsets resulted in a decrease in VEP amplitude for both horizontal and vertical disparities.conclusions. The normal process of fusion results in a single visual direction. To obtain a single visual direction, the visual system must synthesize a binocular visual direction that differs from the monocular components. One of the conditions (the static pedestal with offsets) produces binocular visual direction shifts that degrade the appearance of vernier onset-offset, and reduce VEP amplitude for both horizontal and vertical disparities. This characteristic evoked response marker is a promising tool for measuring binocular fusion objectively in patients with strabismus.
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DOI：
10.1016/0013-4694(91)90099-p
发表时间：
1991-05-01
期刊：
ELECTROENCEPHALOGRAPHY AND CLINICAL NEUROPHYSIOLOGY
影响因子：
--
作者：
VICTOR, JD;MAST, J
通讯作者：
MAST, J
立体深度运动：两只眼睛不如一只眼睛敏感
影响因子：
56.9
作者：
C. Tyler
通讯作者：
C. Tyler
影响因子：
1.8
作者：
J. H. Sumnall;Julie M. Harris
通讯作者：
Julie M. Harris
影响因子：
1.7
作者：
C W Tyler;J M Foley
通讯作者：
J M Foley