Frome F S, Piantanida T P, Kelley D H
Science. 1982 Jan 22;215(4531):417-9. doi: 10.1126/science.6977184.
Psychophysical evidence shows that at least some classically diagnosed dichromats have three cone types rather than two. The anomalous cones, previously thought to be absent, are less sensitive than normal cones to both spectral and temporal variations, and have spectral sensitivities like those of the abnormal cones of anomalous trichromats. These results are not consistent with either loss or replacement models of X-linked recessive color-vision defects, since some dichromats apparently have the same three photopigments as anomalous trichromats.
心理物理学证据表明，至少一些经典诊断的二色视者有三种视锥细胞类型而非两种。以前认为不存在的异常视锥细胞，对光谱和时间变化的敏感度低于正常视锥细胞，并且具有与异常三色视者的异常视锥细胞相似的光谱敏感度。这些结果与X连锁隐性色觉缺陷的缺失或替代模型均不一致，因为一些二色视者显然与异常三色视者具有相同的三种视色素。
