The DOI matches its Crossref record; 46 of the 46 references it cites were found in a registry or an index.
A study of unusual Rayleigh matches in deutan deficiency
Abstract
Rayleigh match data were modeled with the aim of explaining the locations of match midpoints and matching ranges, both in normal trichromats and in subjects with congenital color deficiency. Model parameters included the wavelength of peak sensitivity of cone photopigments, the effective photopigment optical density, and the noise amplitude in the red-green color channel. In order to avoid the suprathreshold, perceptual effects of extreme L:M cone ratios on color vision, selective post-receptoral amplification of cone signals is needed. The associated noise is also amplified and this causes corresponding changes in red-green threshold sensitivity. We propose that the noise amplitude and hence the size of the matching range in normal trichromats relates to the known inter-subject variation in the relative numbers of L and M cones. If this hypothesis can be shown to account for the extremes of the red-green matching range measured in normal trichromats, it is of interest to establish the extent to which it also predicts the unexpected, small matching ranges that are observed in some subjects with red-green color deficiency. A subset of subjects with deutan deficiency that exhibited less common Nagel matches were selected for genetic analysis of their cone pigment genes in order to confirm the type of deficiency, and to predict the corresponding peak wavelength separation (δλ max) of their two, long-wavelength cone pigments. The Rayleigh match model predicted accurately the midpoint and the range for the spectral differences specified by the genes. The prediction also required plausible selection of effective optical density of the cone pigments and noise. The noise needed varied, but the estimates were confined to lie within the limits established from the matching ranges measured in normal trichromats. The model predicts correctly the small matching ranges measured in some deuteranomalous subjects, principally accounted for by a low estimate of noise level in the red-green channel. The model also predicts the “normal” matches made by some subjects that rely on two hybrid genes and therefore exhibit red-green thresholds outside the normal range, typical of mild deuteranomaly.
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“There is very good agreement between the deduced photopigment complement and color vision capabilities of people with color vision defects (Barbur, Rodriguez-Carmona, Harlow, Mancuso, Neitz & Neitz, 2008, Neitz et al., 1996, Neitz et al., 2004, Shevell et al., 1998).”
From The genetics of normal and defective color vision (2011) · cites this paper as Barbur, Rodriguez-Carmona, Harlow, Mancuso, Neitz & Neitz, 2008
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“There is a very good correlation between deuteranomalous behavior in color vision tests and the magnitude of the spectral separation between the underlying L pigments; however, in some cases when people have very small spectral differences between their pigments, discrimination performance as measured by the range of anomaloscope settings accepted as a match is better than might be predicted from”
From The genetics of normal and defective color vision (2011) · cites this paper as Barbur et al., 2008
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Metadata
- Authors
- BARBUR, J. L., RODRIGUEZ-CARMONA, M., HARLOW, J. A., MANCUSO, K., NEITZ, J., & NEITZ, M.
- Venue
- Visual Neuroscience
- Publisher
- Maximum Academic Press
- Published
- 2008-05
- Volume
- 25
- Issue
- 3
- Pages
- 507-516
- ISSN
- 0952-5238
- 1469-8714
- Cited by
- 51
- References
- 46
- Language
- en
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