Green D G, Dowling J E
J Comp Neurol. 1975 Feb 15;159(4):461-72. doi: 10.1002/cne.901590403.
Spectral sensitivities of the gray squirrel, Mexican and 13-line ground squirrel and prairie dog were determined by electroretinography under both dark- and light-adapted conditions. The dark-adapted spectral sensitivity function obtained from intact eyes of these species peaks between 515-525 nm; however, when corrected for lens absorption or recorded from the lensless eye, it peaks near 500 nm and closely matches in shape a rhodopsin nomogram curve (lambda max equals 502 nm). Upon light adaptation all these retinas become relatively more sensitive to long-wave stimuli (i.e., they show a small Purkinje shift). The light-adapted spectral sensitivity function is broader than that obtained from the dark-adapted eye, especially toward the longer wavelengths. Weconclude that in all these species the dark-adapted spectral sensitivity is mediated by a single, rhodopsin-like photopigment and that light-adapted sensitivity is mediated by two (or more) photopigments.
通过视网膜电图，在暗适应和明适应条件下测定了灰松鼠、墨西哥地松鼠、13条纹地松鼠和草原犬鼠的光谱敏感性。从这些物种完整眼睛获得的暗适应光谱敏感性函数在515 - 525纳米之间达到峰值；然而，当校正晶状体吸收或从无晶状体眼睛记录时，它在500纳米附近达到峰值，并且在形状上与视紫红质列线图曲线紧密匹配（λmax等于502纳米）。在明适应时，所有这些视网膜对长波刺激变得相对更敏感（即，它们显示出小的浦肯野位移）。明适应光谱敏感性函数比从暗适应眼睛获得的函数更宽，特别是在较长波长处。我们得出结论，在所有这些物种中，暗适应光谱敏感性由单一的、视紫红质样光色素介导，而明适应敏感性由两种（或更多）光色素介导。
