Abstract

Wavelength discrimination curves have been measured for two normal trichromats for three field sizes and various intensities. In order to obtain high-intensity levels in the blue region, a high-pressure xenon arc was used as a source. Results for the 1° field agree essentially with those of previous workers. The higher blue intensities have led to the establishment of a definite minimum at 420 mμ. Results for the smaller field sizes differ considerably from previous data. The chief reason for this seems to he in the viewing technique used. While previous authors employed strict fixation, this paper reports data obtained with a scanning technique. The effect of different methods of plotting is briefly discussed.

© 1958 Optical Society of America

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References

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  1. E. N. Willmer and W. D. Wright, Nature 156, 119 (1945).
    [Crossref]
  2. L. C. Thomson and W. D. Wright, J. Physiol 105, 316 (1947).
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    [Crossref] [PubMed]
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    [Crossref]
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    [Crossref]
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    [Crossref]
  9. F. H. G. Pitt and W. D. Wright, Proc. Phys. Soc. (London) 46, 459 (1934).
    [Crossref]
  10. R. A. Weale, J. Physiol. 113, 116 (1951).
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  12. R. A. Weale, J. Physiol. 119, 170 (1953).
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    [Crossref] [PubMed]

1957 (1)

1955 (1)

1953 (1)

R. A. Weale, J. Physiol. 119, 170 (1953).

1951 (2)

R. A. Weale, J. Physiol. 113, 116 (1951).

L. C. Thomson and P. W. Trezona, J. Physiol. 114, 98 (1951).

1947 (1)

L. C. Thomson and W. D. Wright, J. Physiol 105, 316 (1947).

1945 (1)

E. N. Willmer and W. D. Wright, Nature 156, 119 (1945).
[Crossref]

1934 (1)

F. H. G. Pitt and W. D. Wright, Proc. Phys. Soc. (London) 46, 459 (1934).
[Crossref]

1933 (1)

1923 (1)

H. Laurens and W. F. Hamilton, Am. J. Physiol. 65, 547 (1923).

1917 (1)

1906 (1)

O. Steindler, Sitzber. Akad. Wiss. Wien,  IIa, 115, 39 (1906).

1884 (1)

A. König and C. Dieterici, Graefe’s Arch. Ophthalmol. II,  30, 171 (1884).
[Crossref]

Bedford, R. E.

Dieterici, C.

A. König and C. Dieterici, Graefe’s Arch. Ophthalmol. II,  30, 171 (1884).
[Crossref]

Hamilton, W. F.

H. Laurens and W. F. Hamilton, Am. J. Physiol. 65, 547 (1923).

Isobi, K.

Jones, L. A.

König, A.

A. König and C. Dieterici, Graefe’s Arch. Ophthalmol. II,  30, 171 (1884).
[Crossref]

Laurens, H.

H. Laurens and W. F. Hamilton, Am. J. Physiol. 65, 547 (1923).

Motokawa, K.

Pitt, F. H. G.

F. H. G. Pitt and W. D. Wright, Proc. Phys. Soc. (London) 46, 459 (1934).
[Crossref]

Steindler, O.

O. Steindler, Sitzber. Akad. Wiss. Wien,  IIa, 115, 39 (1906).

Thomson, L. C.

L. C. Thomson and P. W. Trezona, J. Physiol. 114, 98 (1951).

L. C. Thomson and W. D. Wright, J. Physiol 105, 316 (1947).

Trezona, P. W.

L. C. Thomson and P. W. Trezona, J. Physiol. 114, 98 (1951).

Tyndall, E. P. T.

Weale, R. A.

R. A. Weale, J. Physiol. 119, 170 (1953).

R. A. Weale, J. Physiol. 113, 116 (1951).

Willmer, E. N.

E. N. Willmer and W. D. Wright, Nature 156, 119 (1945).
[Crossref]

Wright, W. D.

L. C. Thomson and W. D. Wright, J. Physiol 105, 316 (1947).

E. N. Willmer and W. D. Wright, Nature 156, 119 (1945).
[Crossref]

F. H. G. Pitt and W. D. Wright, Proc. Phys. Soc. (London) 46, 459 (1934).
[Crossref]

Wyszecki, G. W.

Am. J. Physiol. (1)

H. Laurens and W. F. Hamilton, Am. J. Physiol. 65, 547 (1923).

Graefe’s Arch. Ophthalmol. II (1)

A. König and C. Dieterici, Graefe’s Arch. Ophthalmol. II,  30, 171 (1884).
[Crossref]

J. Opt. Soc. Am. (4)

J. Physiol (1)

L. C. Thomson and W. D. Wright, J. Physiol 105, 316 (1947).

J. Physiol. (3)

R. A. Weale, J. Physiol. 113, 116 (1951).

L. C. Thomson and P. W. Trezona, J. Physiol. 114, 98 (1951).

R. A. Weale, J. Physiol. 119, 170 (1953).

Nature (1)

E. N. Willmer and W. D. Wright, Nature 156, 119 (1945).
[Crossref]

Proc. Phys. Soc. (London) (1)

F. H. G. Pitt and W. D. Wright, Proc. Phys. Soc. (London) 46, 459 (1934).
[Crossref]

Sitzber. Akad. Wiss. Wien (1)

O. Steindler, Sitzber. Akad. Wiss. Wien,  IIa, 115, 39 (1906).

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Figures (7)

F. 1
F. 1

Dimensions of field sizes used in the experiments.

F. 2
F. 2

Wavelength discrimination curves for observer R. B. for three field sizes and various intensity levels as given in Table I. The ordinate 〈Δλ〉 is the average of the least noticeable differences measured on either side of the comparison wavelength plotted as the abscissa.

F. 3
F. 3

Wavelength discrimination curves for observer G. W. for three field sizes and various intensity levels as given in Table I. The ordinate 〈Δλ〉 is the average of the least noticeable differences measured on either side of the comparison wavelength plotted as the abscissa.

F. 4
F. 4

Replotted wavelength discrimination data of W.D.W.1 The solid circles are observational points and the open circles are approximate averages joined by straight lines.

F. 5
F. 5

Dependence of wavelength discrimination on field size for observers R. B. and G. W.

F. 6
F. 6

Relative standard deviations σ〈Δλ〉/〈Δλ〉 as a function of λ for several observational conditions for observers R. B. and G. W.

F. 7
F. 7

Plot of (+Δλ) and (−Δλ) discrimination curves for observer R. B. and two field sizes. The solid curves (+Δλ) represent least noticeable differences measured to increasing wavelength, while the dotted curves (−Δλ) represent least noticeable differences measured to decreasing wavelength.

Tables (2)

Tables Icon

Table I Field sizes, brightness levels, wavelength ranges, and observational intervals used in the determination of wavelength discrimination.

Tables Icon

Table II Positions of relative maxima and minima in the wavelength discrimination curves for observers R. B. and G. W. and the various observational conditions.a