Vergence eye movements in response to binocular disparity without depth perception
Vergence eye movements in response to binocular disparity without depth perception
复制标题
DOI：
10.1038/38496
复制
发表时间：
1997-09-18
期刊：
影响因子：
64.8
通讯作者：
Miles, FA
中科院分区：
文献类型：
--
作者：
Masson, GS;Busettini, C;Miles, FA
灵长类动物用会聚眼运动将两只眼睛对准同一个物体，并通过感知物体的两个视网膜图像位置的差异（双眼视差）来纠正不对准。当大的随机点模式被双视观察和小的双眼错位突然被施加（视差步骤）时，矫正会聚眼运动在超短潜伏期被激发（1,2）。在这里，我们展示了同样的步骤应用于密集的反相关模式，其中一只眼睛的每个黑点与另一只眼睛的白点相匹配，引发了非常相似的收敛响应，除了它们在相反的方向。这种对反相关模式差异的敏感性为皮质区V1的许多差异选择神经元所共有（参考文献3），尽管人类受试者无法感知此类刺激的深度（4,5）。这些数据表明，在超短潜伏期启动的收敛性眼动仅仅是由局部匹配的双目特征引起的，并且在深度知觉形成之前，它们的视觉输入来自皮层加工的早期阶段。
Primates use vergence eye movements to align their two eyes on the same object and can correct misalignments by sensing the difference in the positions of the two retinal images of the object (binocular disparity). When large random-dot patterns are viewed dichoptically and small binocular misalignments are suddenly imposed (disparity steps), corrective vergence eye movements are elicited at ultrashort latencies(1,2). Here we show that the same steps applied to dense anticorrelated patterns, in which each black dot in one eye is matched to a white dot in the other eye, initiate vergence responses that are very similar, except that they are in the opposite direction. This sensitivity to the disparity of anticorrelated patterns is shared by many disparity-selective neurons in cortical area V1 (ref. 3), despite the fact that human subjects fail to perceive depth in such stimuli(4,5). These data indicate that the vergence eye movements initiated at ultrashort latencies result solely from locally matched binocular features, and derive their visual input from an early stage of cortical processing before the level at which depth percepts are elaborated.