Rods affect S-cone discrimination on the Farnsworth-Munsell 100-hue test.
Rod influence on hue discrimination was assessed by the Farnsworth-Munsell 100-hue test. Rod influence was taken as the difference in error scores obtained after complete dark adaptation and during the cone plateau at three mesopic (23, 9, 3 td) and one standard (158 td) light level. On the FM 100, rods produced a differential discrimination loss along a tritan axis as compared with a red-green axis without any bias toward a rod confusion axis. Rods appear to impair discrimination mediated by S-cone pathways, which at moderate levels of illumination can differentially elevate tritan errors on the FM 100.
Knight
R
R
Department of Psychology, University of Washington, Seattle 98195, USA. Rknight@u.washington.edu
Buck
S L
SL
Fowler
G A
GA
Nguyen
A
A
D000328:Adult; D003119:Color Perception Tests / Q000379:methods*; D003623:Dark Adaptation; D004056:Differential Threshold / Q000502:physiology; D005583:Fourier Analysis; D006801:Humans; D017949:Retinal Cone Photoreceptor Cells / Q000502:physiology*; D017948:Retinal Rod Photoreceptor Cells / Q000502:physiology*