Behavioral evidence of filling-in at the blind spot of the monkey
Behavioral evidence of filling-in at the blind spot of the monkey
复制标题
猴子盲点填补的行为证据
DOI：
10.1017/s0952523800006921
复制
发表时间：
1994
影响因子：
1.9
通讯作者：
I. Murakami
中科院分区：
文献类型：
--
作者：
H. Komatsu;I. Murakami
摘要在人类受试者中，盲点被来自周围视野的颜色和亮度感知地填充。本行为学研究探讨了颜色填充在猴子的盲点的发生。首先，使用单眼扫视任务确定盲点的位置。盲点位于水平子午线上，与颞侧视野中的注视点大约成15-17度。然后，通过确定猴是否能够区分盲点上存在的环形物和正常视野中的均匀圆盘来测试盲点处的填充。在这项任务中，猴子被要求对一个颜色和大小相同的均匀圆盘进行扫视，作为在相反的视野中同时出现的环。两种刺激都足够大以覆盖盲点，并且环的内圈被限制在盲点内。在超过80%的试验中，所有四只猴子都正确地完成了这项任务。然而，当一只眼睛被遮盖并且瓣环出现在未遮盖眼睛的盲点上时，性能显著恶化。为了证实这些结果反映了填补，训练一只猴子在两个相同的同质圆盘出现在相反的视野时保持注视。当只有一只眼睛未被遮盖，并且瓣环出现在未遮盖眼睛的盲点上时，猴子在大多数试验中保持注视。这些结果表明，当环出现在盲点上时，猴子无法区分环和均匀圆盘。这表明，颜色填充发生在猴子的盲点，并打开生理实验研究的神经机制的填充。
Abstract In human subjects, the blind spot is perceptually filled-in by color and brightness from the surrounding visual field. The present behavioral study examined the occurrence of color filling-in at the blind spot in monkeys. First, the location of the blind spot was determined using a monocular saccade task. The blind spots were located on the horizontal meridian at approximately 15–17 deg from the fixation point in the temporal visual field. Then, filling-in at the blind spot was tested by determining if the monkey could discriminate between an annulus presented on the blind spot and a homogeneous disk in the normal visual field. In this task, the monkey was required to make a saccade to a homogeneous disk of the same color and size as an annulus presented simultaneously in the opposite field. Both stimuli were large enough to cover the blind spot and the inner circle of the annulus was confined inside the blind spot. All four monkeys tested performed this task correctly in over 80% of the trials. However, when one eye was covered and the annulus was presented on the blind spot of the uncovered eye, performance deteriorated significantly. To confirm that these results reflected filling-in, one monkey was trained to maintain fixation when two identical homogeneous disks appeared in opposite visual fields. When only one eye was uncovered, and the annulus was presented on the blind spot of the uncovered eye, the monkey maintained fixation in most of the trials. These results show that monkeys were unable to distinguish an annulus from a homogeneous disk when the annulus was presented on the blind spot. This indicates that color filling-in occurs at the blind spot in monkeys and opens possibility to physiological experiments to study the neural mechanisms of filling-in.