Abstract

Hue discrimination is poor when measured with fine gratings in which alternate bars differ in wavelength but not in luminance, or with small test objects that differ in wavelength from their background. Hue discrimination improves if a small luminance contrast is added. This effect is strongest for small test objects, and decreases as the size of the test object increases, or as the spatial frequency of the grating decreases, so that luminance contrast has little effect on hue discrimination measured with a 2° bipartite field. When measured with equiluminous square-wave gratings, an observer’s sensitivity to small wavelength differences increases monotonically as spatial frequency is decreased. When a luminance contrast is included, maximum sensitivity occurs when the grating has a spatial frequency of about 3 cycles/deg, and decreases at higher and lower spatial frequencies, so that its shape resembles the luminance modulation transfer function of the visual system. Hue-discrimination performance is better when measurements are made with the 3-cycles/deg grating with luminance contrast than with a conventional bipartite field.

© 1974 Optical Society of America

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References

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  1. R. Hilz and C. R. Cavonius, J. Opt. Soc. Am. 60, 272 (1970).
    [CrossRef]
  2. H. Schober and R. Hilz, J. Opt. Soc. Am. 55, 1086 (1965).
    [CrossRef]
  3. R. L. DeValois, Invest. Ophthalmol. 11, 417 (1972).
  4. C. R. Ingling and B. A. Drum, Vision Res. 13, 1151 (1973).
    [CrossRef] [PubMed]
  5. S. Liebmann, Psychol. Forsch. 9, 300 (1927).
    [CrossRef]
  6. I. Rentschler, Vision Res. 13, 325 (1973).
    [CrossRef] [PubMed]

1973 (2)

C. R. Ingling and B. A. Drum, Vision Res. 13, 1151 (1973).
[CrossRef] [PubMed]

I. Rentschler, Vision Res. 13, 325 (1973).
[CrossRef] [PubMed]

1972 (1)

R. L. DeValois, Invest. Ophthalmol. 11, 417 (1972).

1970 (1)

R. Hilz and C. R. Cavonius, J. Opt. Soc. Am. 60, 272 (1970).
[CrossRef]

1965 (1)

1927 (1)

S. Liebmann, Psychol. Forsch. 9, 300 (1927).
[CrossRef]

Cavonius, C. R.

R. Hilz and C. R. Cavonius, J. Opt. Soc. Am. 60, 272 (1970).
[CrossRef]

DeValois, R. L.

R. L. DeValois, Invest. Ophthalmol. 11, 417 (1972).

Drum, B. A.

C. R. Ingling and B. A. Drum, Vision Res. 13, 1151 (1973).
[CrossRef] [PubMed]

Hilz, R.

R. Hilz and C. R. Cavonius, J. Opt. Soc. Am. 60, 272 (1970).
[CrossRef]

H. Schober and R. Hilz, J. Opt. Soc. Am. 55, 1086 (1965).
[CrossRef]

Ingling, C. R.

C. R. Ingling and B. A. Drum, Vision Res. 13, 1151 (1973).
[CrossRef] [PubMed]

Liebmann, S.

S. Liebmann, Psychol. Forsch. 9, 300 (1927).
[CrossRef]

Rentschler, I.

I. Rentschler, Vision Res. 13, 325 (1973).
[CrossRef] [PubMed]

Schober, H.

Invest. Ophthalmol. (1)

R. L. DeValois, Invest. Ophthalmol. 11, 417 (1972).

J. Opt. Soc. Am. (2)

R. Hilz and C. R. Cavonius, J. Opt. Soc. Am. 60, 272 (1970).
[CrossRef]

H. Schober and R. Hilz, J. Opt. Soc. Am. 55, 1086 (1965).
[CrossRef]

Psychol. Forsch. (1)

S. Liebmann, Psychol. Forsch. 9, 300 (1927).
[CrossRef]

Vision Res. (2)

I. Rentschler, Vision Res. 13, 325 (1973).
[CrossRef] [PubMed]

C. R. Ingling and B. A. Drum, Vision Res. 13, 1151 (1973).
[CrossRef] [PubMed]

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Figures (4)

Fig. 1
Fig. 1

Wavelength discrimination for square-wave gratings with spatial frequencies of 2.4 cycle/deg (circles) and 5.8 cycle/deg (triangles). Open symbols: equiluminous gratings; filled symbols: 0.1 log-luminance contrast between adjacent bars. The solid lines are a mean drawn by eye through the mean values of Δλ for the four sets of data, which are the means for two normal observers.

Fig. 2
Fig. 2

Wavelength discrimination at 560 nm as a function of spatial frequency for equiluminous square-wave gratings (circles), and for gratings with a 0.045 log-luminance difference between adjacent bars (triangles). bf = 2° bipartite field.

Fig. 3
Fig. 3

Wavelength discrimination at 560 nm measured with square-wave gratings of several spatial frequencies, as a function of luminance difference between adjacent bars.

Fig. 4
Fig. 4

Wavelength discrimination measured with elliptical targets, as a function of the luminance difference between the target and the 560-nm background. Positive abscissa: target brighter than background; negative abscissa: target darker. Target size: (×) = 3.6′; (▵) = 6.4′; (○) = 25.4′; (+) = 34.8′.