Crocker R A, Ringo J, Wolbarsht M L, Wagner H G
Department of Ophthalmology, Duke University Medical Center, Durham, North Carolina 27710, USA.
J Gen Physiol. 1980 Dec;76(6):763-85. doi: 10.1085/jgp.76.6.763.
Extracellular microelectrode recordings were made from ganglion cells of the intact, in situ eyes of adult common domestic cats. Three different photopic systems, with peak spectral sensitivities at 450, 500, and 556 nm, were observed. All ganglion cells received input from a cone system with a peak spectral sensitivity of 556 nm. The blue-sensitive cone system was observed in about one-half of the ganglion cells studied. In each case the 450-nm cone system contributed to only one functional type of response, either ON or OFF, in the same cell. The other two photopic systems most often contributed to both the ON and OFF responses of an individual ganglion cell. In four cases the 450-nm cone system mediated responses that were opponent to those of the other two photopic systems. The third photopic mechanism has a peak spectral sensitivity at 500 nm and contributed to most receptive field surrounds and many receptive field centers. It is distinguished from the rod system by the occurrence of a break in both dark-adaptation curves and increment-sensitivity curves. No apparent differences in receptive field cone contributions between brisk-sustained and brisk-transient cells were seen.
从成年普通家猫完整的原位眼睛的神经节细胞进行细胞外微电极记录。观察到三种不同的明视觉系统，其峰值光谱敏感度分别在450、500和556纳米处。所有神经节细胞都接收来自峰值光谱敏感度为556纳米的视锥系统的输入。在约一半被研究的神经节细胞中观察到了对蓝光敏感的视锥系统。在每种情况下，450纳米的视锥系统在同一细胞中仅促成一种功能性反应类型，即开或关。另外两个明视觉系统最常促成单个神经节细胞的开和关反应。在四个案例中，450纳米的视锥系统介导的反应与其他两个明视觉系统的反应相反。第三种明视觉机制的峰值光谱敏感度在500纳米处，对大多数感受野周边和许多感受野中心有贡献。它与视杆系统的区别在于暗适应曲线和增量敏感度曲线都出现了断点。在持续快速放电和瞬态快速放电细胞之间，未观察到感受野视锥贡献的明显差异。
