Blakeslee B, Jacobs G H, Neitz J
Department of Psychology, University of California, Santa Barbara 93106.
J Comp Physiol A. 1988 Apr;162(6):773-80. doi: 10.1007/BF00610966.
The retina of the gray squirrel (Sciurus carolinensis) contains rods and cones in a ratio of about 2:3. The spectral mechanisms in this retina were examined in behavioral and electrophysiological experiments. Tests of color vision revealed that this animal has a spectral neutral point at about 500 nm and, thus, dichromatic color vision. Recordings made from single optic nerve fibers and results obtained from an analysis of the flicker photometric electroretinogram (ERG) indicated that vision in the gray squirrel is based on three spectral mechanisms. One of these, presumably rod-based, has peak sensitivity at about 502 nm. The other two mechanisms reflect the presence of two classes of cone having average peak sensitivity of about 444 nm and 543 nm.
灰松鼠（Sciurus carolinensis）的视网膜中视杆细胞和视锥细胞的比例约为2:3。通过行为学和电生理学实验研究了该视网膜的光谱机制。色觉测试表明，这种动物在约500纳米处有一个光谱中性点，因此具有双色视觉。从单根视神经纤维进行的记录以及对闪烁光度视网膜电图（ERG）分析得出的结果表明，灰松鼠的视觉基于三种光谱机制。其中一种可能基于视杆细胞，在约502纳米处具有峰值敏感度。另外两种机制反映了两类视锥细胞的存在，其平均峰值敏感度约为444纳米和543纳米。
