Spot illumination within the blind spot affects the absolute threshold for light in a normal region of the visual field.
Spot illumination within the blind spot affects the absolute threshold for light in a normal region of the visual field.
复制标题
盲点内的点照明会影响视野正常区域中光的绝对阈值。
DOI：
10.1167/jov.20.11.943
复制
发表时间：
2020
影响因子：
1.8
通讯作者：
Ikuya Murakami
中科院分区：
文献类型：
--
作者：
Marina Saito;Kentaro Miyamoto;Ikuya Murakami
直接进入自然盲点的光斑照明对我们来说是不可见的，因为那里缺乏杆/锥光感受器。然而，我们以前的研究（Saito等人，2018）证明投射到盲点的点照明影响我们在视野的正常区域中的亮度感知，这表明存在一种机制，使得可以在盲点内接收点照明。然而，我们仍然不了解盲点照明与其他性能，如光检测阈值和对比敏感度之间的关系。本研究旨在测试当盲点同时被照亮时，视野的正常区域中的光检测阈值是否改变。观察者只睁开右眼观察刺激物。我们比较了绝对阈值的光刺激闪烁在左半视野，并在右眼的盲点内同时照明。我们发现，当盲点被低亮度蓝光照射时，光检测阈值增加（t（17）=-2.99，p <0.01）。05）。接下来，我们确定了对比度阈值的光刺激在一个灰色的背景中，在左半野与和没有同时照明的盲点内的右眼。当我们同时照射盲点时，对比度阈值没有改变（t（17）=-1.19，p> 0.05）。05）。因此，我们认为存在一种机制，在盲点内接收照明，并且投射到盲点的照明对我们来说是不可见的，但会影响我们对其他地方的光的绝对阈值。一个可能的解释涉及黑视蛋白色素沉着，据报道，该色素沉着沿着穿过视盘的轴突表达。
Spot illumination directly entering the natural blind spot is invisible to us because of the lack of rod/cone photoreceptors there. However, our previous research (Saito et al., 2018) demonstrated that spot illumination projected to the blind spot affects our brightness perception in a normal region of the visual field, suggesting that there exists a mechanism that makes it possible to receive spot illumination within the blind spot. Nevertheless, we still do not understand the relationship between the blind-spot illumination and other performances such as light detection threshold and contrast sensitivity. The present study aimed to test whether the light detection threshold in a normal region of the visual field changes when the blind spot is simultaneously illuminated. Observers viewed stimuli with only the right eye open. We compared the absolute threshold for a light stimulus flashed in the left visual hemifield with and without simultaneous illumination within the blind spot of the right eye. We found that the light detection threshold increased when the blind spot was illuminated by low-luminance blue light (t (17)=-2.99, p<. 05). Next, we determined contrast threshold for a light stimulus within a gray background in the left hemifield with and without simultaneous illumination within the blind spot of the right eye. The contrast threshold did not change when we simultaneously illuminated the blind spot (t (17)=-1.19, p>. 05). Therefore, we suggest that there exists a mechanism receiving illumination within the blind spot and that illumination projected to the blind spot is invisible to us but affects our absolute threshold for light elsewhere. A possible account involves melanopsin photopigment that is reportedly expressed along axons passing through the optic disk.