Mascetti G G, Ogden T E
Estelle Doheny Eye Foundation, Los Angeles, CA 90033.
Acta Physiol Pharmacol Latinoam. 1989;39(2):165-72.
The receptive field properties of internal horizontal cells (IHCs) were studied in the frog Rana pipiens. The space constant of each cell was determined by the use of stimulus spots of various sizes or by moving a light slit across the retina, varied from 100-500 microns by the former and 100-720 microns by the latter method. A similar range of values has been reported for Xenopus although its IHCs are much larger than the IHCs of Rana. Apparently, coupling among the IHCs is more efficient in the latter than in the former retina. The large range in values suggests substantial variation in coupling efficiency among cells of the same retina.
对牛蛙的内水平细胞（IHCs）的感受野特性进行了研究。通过使用不同大小的刺激光斑或让一个光缝在视网膜上移动来确定每个细胞的空间常数，前一种方法得到的值在100 - 500微米之间，后一种方法得到的值在100 - 720微米之间。尽管非洲爪蟾的内水平细胞比牛蛙的内水平细胞大得多，但关于非洲爪蟾也报道了类似的数值范围。显然，内水平细胞之间的耦合在牛蛙视网膜中比在非洲爪蟾视网膜中更有效。数值的大范围表明同一视网膜的细胞之间耦合效率存在很大差异。
