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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 60, Iss. 4 — Apr. 1, 1970
  • pp: 562–569

Wavelength Discrimination in the Presence of Added Chromatic Fields

JOEL POKORNY and VIVIANNE C. SMITH  »View Author Affiliations


JOSA, Vol. 60, Issue 4, pp. 562-569 (1970)
http://dx.doi.org/10.1364/JOSA.60.000562


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Abstract

The purpose of this research was to investigate the effect of adding various luminances of monochromatic light to a wavelength-discrimination target. As the additive luminance was increased, the size of the discrimination step increased. With a 650-nm added field, the wavelength-discrimination functions showed asymmetrical displacement, with comparatively little change for wavelengths below 480 nm. With a 435-nm addition, the wavelength-discrimination steps increased for all wavelengths. With a 578-nm addition, they increased in the spectral region 500–600 nm.

Citation
JOEL POKORNY and VIVIANNE C. SMITH, "Wavelength Discrimination in the Presence of Added Chromatic Fields," J. Opt. Soc. Am. 60, 562-569 (1970)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-60-4-562


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References

  1. L. C. Thomson and W. D. Wright, J. Physiol. (London) 105, 316 (1947).
  2. W. D. Wright and F. H. G. Pitt, Proc. Phys. Soc. (London) 46, 459 (1934).
  3. R. E. Bedford and G. W. Wyszecki, J. Opt. Soc. Am. 48, 129 (1958).
  4. The data presented in Figs. 2–5 required between five and ten sessions for each added-field luminance. The task is difficult and there is considerable variability both within and between subjects. We consider that the functions indicate definite trends. Data from other subjects indicate that the added-field luminances required to produce a given effect (e.g., loss of discrimination above 520 nm with added red) are of similar magnitude to those for JS.
  5. It might be questioned whether the relative symmetry of the functions obtained with a 435-nm added field reflects the fact that we have treated the data in terms of wavelength rather than frequency. There have been numerous suggestions that a frequency rather than a wavelength scale is the appropriate metric for treating visual functions. J. P. Heilman [J. Opt. Soc. Am. 57,281 (1967)] has noted that the conversion is nonlinear for the ordinate as well as the abscissa when wavelength-discrimination data are plotted. Even with this conversion, with a red added field, the loss of discrimination in the red is very rapid compared with the loss in the blue. The blue added-field data show greater symmetry when expressed in frequency units; however, the differential effects of the 650- and 435-nm added fields are still apparent.
  6. W. D. Wright, J. Physiol. (London) 87, 23 (1936); J. Cohen, Am J. Psychol. 59, 84 (1946); G. S. Brindley, J. Physiol (London) 122, 332 (1953).
  7. W. F. Hamilton and H. Laurens, Am. J. Physiol. 65, 569 (1923); W. D. Wright, Researches on Normal and Defective Color Vision (H. Kimpton, London, C. V. Mosby, St. Louis, 1946), p. 203.
  8. A review of the early literature appears in J. Cohen, Psychol. Bull. 43, 121 (1946).
  9. F. L. Tufts, Phys. Rev. 25, 433 (1907).
  10. H. DeVries, Physica 14, 319 (1948); W. S. Stiles, Proc. Nat. Acad. Sci. (U.S.) 45, 100 (1959); G. Wald, Science 145, 1007 (1964); H. G. Sperling, N. A. Sidley, W. S. Dockens, and C. L. Jolliffe, J. Opt. Soc. Am. 58, 263 (1968).
  11. R. M. Boynton, G. Kandel, and J. W. Onley, J. Opt. Soc. Am. 49, 654 (1959).
  12. A protanope showed a similar displacement of his minimum toward shorter wavelengths with a high-luminance red added field.

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