Korth M, Nguyen N X, Rix R, Sembritzki O
University Eye Hospital, Erlangen, Germany.
Vision Res. 1993 Feb;33(3):275-87. doi: 10.1016/0042-6989(93)90084-a.
The spectral sensitivity and the spatial selectivity was studied both psychophysically and electroretinographically using the pattern onset-offset paradigm. All measurements were made under intensive yellow adaptation. The spectral sensitivity functions of both measures were in close agreement. They showed a peak at 460 nm (blue-sensitive mechanism) and a shoulder around 550 nm (red-green-sensitive mechanism). The luminance curves of the pattern onset ERG obtained with long wavelengths had a steeper slope and reached larger amplitudes than those obtained with short wavelengths. In addition the response-peak times were longer with short wavelengths. When the spatial frequency of the pattern was varied the 460 nm-onset responses showed very little or no spatial tuning and long peak times (around 60 msec). This was ascribed to the contribution from only one type of ganglion cell, namely the blue-yellow opponent receptive fields lacking a center-surround organization. The 550 nm-onset responses showed a clear spatial tuning (4 c/deg) and an increase in peak time (40-50 msec) with increasing spatial frequency (0.26-9.2 c/deg). This was ascribed to different types of receptive fields having a center-surround structure.
采用模式起始-偏移范式，通过心理物理学和视网膜电图学方法研究了光谱敏感性和空间选择性。所有测量均在高强度黄色适应条件下进行。两种测量方法的光谱敏感性函数高度一致。它们在460nm处有一个峰值（蓝敏机制），在550nm左右有一个肩峰（红绿敏机制）。长波长下获得的模式起始视网膜电图的亮度曲线斜率更陡，幅度比短波长下获得的更大。此外，短波长下的反应峰值时间更长。当改变模式的空间频率时，460nm起始反应显示出很少或没有空间调谐，且峰值时间较长（约60毫秒）。这归因于仅一种类型的神经节细胞的贡献，即缺乏中心-外周组织的蓝黄拮抗感受野。550nm起始反应显示出明显的空间调谐（4周/度），并且随着空间频率增加（0.26 - 9.2周/度）峰值时间增加（40 - 50毫秒）。这归因于具有中心-外周结构的不同类型的感受野。
