Eigner D, Wündsch L, von Lützow-Kafka A
Ophthalmic Res. 1984;16(1-2):48-53. doi: 10.1159/000265293.
The spectral sensitivity of the European ground squirrel was investigated by electroretinography (ERG) and visual-evoked cortical potentials. Using chromatic adaptation, two spectral systems were found, one peaking between 520 and 530 nm, the other at 465 nm. The blue system was characterized by a slower course of the potential, a lower threshold and the lack of a d wave in the ERG. However, its threshold is higher than the rod threshold and it was shown to be more resistant to adapting light stimuli than rod systems are. It is concluded that the second spectral system is a blue cone system which in its rod-like properties is comparable to the blue cones found in cat, monkey and man.
通过视网膜电图（ERG）和视觉诱发电位研究了欧洲地松鼠的光谱敏感性。采用颜色适应法，发现了两个光谱系统，一个峰值在520至530纳米之间，另一个在465纳米处。蓝色系统的特点是电位变化过程较慢、阈值较低且ERG中缺乏d波。然而，其阈值高于视杆细胞阈值，并且已证明它比视杆细胞系统对适应性光刺激更具抗性。得出的结论是，第二个光谱系统是一个蓝色视锥系统，其类似视杆细胞的特性与猫、猴和人类中的蓝色视锥细胞相当。
