Two eyes in action
Two eyes in action
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DOI：
10.1007/s00221-005-0213-9
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发表时间：
2006-04-01
影响因子：
2
通讯作者：
Smeets, JBJ
中科院分区：
文献类型：
--
作者：
Brenner, E;Smeets, JBJ
相对的双眼视差是否指导我们的深度运动？为了找到答案，我们要求受试者在眼睛高度的模拟水平面内移动一个“光标”到一个目标。他们通过移动电脑鼠标来做到这一点。我们确定了受试者对深度跳跃目标的反应速度。我们发现受试者需要大约200毫秒才能对双眼视差的变化做出反应。如果光标在目标跳跃的深度附近暂时只对一只眼睛可见，那么受试者的反应也会很快，如果光标跳跃而不是目标，那么反应就不那么剧烈了，尽管同样快，所以最快的双眼反应不能直接基于目标和光标之间的相对视网膜视差。受试者的反应更快的变化，在目标的高度在视野中比在双眼视差的变化，但没有反应更快的图像大小的变化。这些结果表明，双目视觉主要是通过让人们更好地感知相关物体的距离来改善人们的日常运动，而不是通过相对视网膜差异来直接指导运动。我们认为，相对差异只指导部分非常缓慢的运动，需要极端的精度。
Do relative binocular disparities guide our movements in depth? In order to find out we asked subjects to move a 'cursor' to a target within a simulated horizontal plane at eye height. They did so by moving a computer mouse. We determined how quickly subjects responded to the target jumping in depth. We found that it took subjects about 200 ms to respond to changes in binocular disparity. Subjects responded just as quickly if the cursor was temporarily only visible to one eye near the time that the target jumped in depth, and less vigorously, though just as quickly, if the cursor jumped rather than the target, so the fastest binocular responses cannot be based directly on the relative retinal disparity between the target and the cursor. Subjects reacted faster to changes in the target's height in the visual field than to changes in binocular disparity, but did not react faster to changes in image size. These results suggest that binocular vision mainly improves people's everyday movements by giving them a better sense of the distances of relevant objects, rather than by relative retinal disparities being used to directly guide the movement. We propose that relative disparities only guide parts of very slow movements that require extreme precision.