Research on the correlation between the initial pupillary light reflex, the perceptual brightness, and the excitations of the photoreceptors was performed for unrelated self‐luminous 10° stimuli at low photopic light levels (5 to 80 cd/m²). All stimuli were optically characterized using a spectroradiometer. For determining the pupillary diameter, an Eye Tracker was used. The perceived brightness was evaluated with the magnitude estimation method. Test stimuli were presented alternating with a reference stimulus and the Michelson contrast of the pupillary diameter between test and reference conditions was calculated. Six observers (three female and three male) participated, with ages between 30 and 39 years (with an average of 34.5 years). It was found that the coefficient of determination between the pupillary response and the perceived stimulus brightness was higher than the corresponding value for luminance, allowing the suggestion that brightness has a greater effect on pupillary size than luminance. Nevertheless, this is not the complete story: highly saturated red and blue stimuli both induce a high brightness perception but the pupil contraction induced by the blue stimuli is much greater than for the red stimuli. Pupillary diameter was also studied as a function of the relative excitations of the five photoreceptors. The effect of rod and ipRGC excitations on pupillary size variation seems to be larger than that of the other photoreceptors. However, for the working conditions prevailing in this research, it could be expected that rods are not very active and that the ipRGC response might be the major driving mechanism.

中文翻译：

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弱光下无关的自发光刺激的瞳孔大小，亮度和感光反应之间的关系

在低视光水平（5至80 cd / m ^2）下，对无关的自发光10°刺激进行了初始瞳孔光反射，感知亮度和感光器激发之间的相关性研究）。使用分光辐射计对所有刺激物进行光学表征。为了确定瞳孔直径，使用了眼动仪。使用大小估计方法评估感知的亮度。测试刺激与参考刺激交替出现，并计算了测试条件与参考条件之间瞳孔直径的迈克尔逊对比度。六名观察员（三名女性和三名男性）参加了会议，年龄在30至39岁之间（平均34.5岁）。发现在瞳孔响应和感知到的刺激亮度之间的确定系数高于亮度的相应值，这表明亮度对瞳孔尺寸的影响大于亮度。但是，这还不是完整的故事：高度饱和的红色和蓝色刺激均会引起高亮度感知，但蓝色刺激所引起的瞳孔收缩要比红色刺激大得多。还研究了瞳孔直径与五个感光器的相对激发的关系。杆和ipRGC激发对瞳孔大小变化的影响似乎大于其他感光体。但是，对于本研究中普遍存在的工作条件，可以预期杆不是很活跃，并且ipRGC响应可能是主要的驱动机制。杆和ipRGC激发对瞳孔大小变化的影响似乎大于其他感光体。但是，对于本研究中普遍存在的工作条件，可以预期杆不是很活跃，并且ipRGC响应可能是主要的驱动机制。杆和ipRGC激发对瞳孔大小变化的影响似乎大于其他感光体。但是，对于本研究中普遍存在的工作条件，可以预期杆不是很活跃，并且ipRGC响应可能是主要的驱动机制。