Nguyen X N, Korth M, Rix R, Sembritzki O
Universitäts-Augenklinik Erlangen.
Ophthalmologe. 1993 Apr;90(2):143-7.
Pattern onset-offset ERGs and VEPs in response to square-wave stripe patterns of different wavelengths and spatial frequencies under chromatic yellow adaptation (two-channel Maxwellian view) were studied in three subjects. One channel provided a steady homogeneous adapting field of 570 nm, while the other channel, containing the patterns, was superimposed on the adapting field (33 degrees). The spectral sensitivity curve of the ERG had a prominent peak in the blue (460 nm) and a shoulder in the red and green (above 500 nm). For wavelengths below 500 nm the shape of the psychophysically determined sensitivity curve to the onset and offset of the pattern was in close agreement with the electroretinal sensitivity curves determined for a low-amplitude criterion. With almost all wavelengths there were two components in the same VEP response at the same time: a slow negative wave with maximum sensitivity at 460 nm and an earlier fast positive component with maximum sensitivity in the red-green region. When the spatial frequency of a 460 nm test pattern was varied under yellow adaptation the onset response in the ERG showed only very slight spatial tuning. In the onset response of the VEP, however, the slow component showed prominent spatial tuning (around 2 c/deg) under the same conditions.
在三名受试者中研究了在黄色适应（双通道麦克斯韦观察法）下，对不同波长和空间频率的方波条纹图案做出反应的图形起始 - 偏移视网膜电图（ERG）和视觉诱发电位（VEP）。一个通道提供570 nm的稳定均匀适应场，而另一个包含图案的通道叠加在适应场上（33度）。ERG的光谱敏感性曲线在蓝光区域（460 nm）有一个突出的峰值，在红光和绿光区域（500 nm以上）有一个肩部。对于波长低于500 nm的情况，心理物理学确定的对图案起始和偏移的敏感性曲线形状与针对低幅度标准确定的视网膜电图敏感性曲线密切一致。几乎在所有波长下，同一VEP反应中同时存在两个成分：一个在460 nm处具有最大敏感性的缓慢负波和一个在红绿区域具有最大敏感性的较早快速正成分。当在黄色适应下改变460 nm测试图案的空间频率时，ERG中的起始反应仅表现出非常轻微的空间调谐。然而，在相同条件下，VEP的起始反应中，缓慢成分表现出明显的空间调谐（约2 c/deg）。
