Abstract

The border contour remaining when juxtaposed, heterochromatic fields were equated in luminance by the minimally distinct border (MDB) method was assessed by an increment-threshold technique. In general, the results showed that increment-threshold sensitivity, using a white test probe, did not vary across the chromatic border. A second control experiment, in which the MDB was deliberately offset, demonstrated that increment thresholds reflect achromatic luminance imbalances introduced between heterochromatic fields. This second experiment showed an increase of threshold at the border similar to the Mach-band-like elevations commonly found for fields of dissimilar homochromatic luminance. Both experiments yield results that are consistent with current theory. That is, equating heterochromatic luminance by the MDB technique balances achromatic channels somewhere in the visual system. The chromatic channels, on the other hand, remain imbalanced making the more-saturated field appear brighter. The present work suggests that the increment-threshold method is sensitive only to differences between achromatic channels, not to relative brightness differences due to chromatic-channel imbalance.

© 1974 Optical Society of America

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References

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  1. G. Wagner and R. M. Boynton, J. Opt. Soc. Am. 62, 1508 (1972).
    [Crossref] [PubMed]
  2. R. M. Boynton and P. K. Kaiser, Science 161, 366 (1968).
    [Crossref] [PubMed]
  3. C. E. Sternheim, R. A. Glass, and J. V. Keller, Vision Res. 12, 1715 (1972).
    [Crossref] [PubMed]
  4. R. M. Boynton, J. Opt. Soc. Am. 63, 1037 (1973).
    [Crossref] [PubMed]
  5. P. K. Kaiser and T. S. Greenspon, J. Opt. Soc. Am. 61, 962 (1971).
    [Crossref] [PubMed]
  6. Thus we find evidence for Mach-band-like effects only at borders that result from both chromatic and achromatic imbalances. We are unable to verify the prediction that chromatic spatial separation alone is sufficient to elicit the phenomenon. See, e.g., A. Fiorentini, in Handbook of Sensory Physiology VII/4, Visual Psychophysics, edited by D. Jameson and L. M. Hurvich (Springer, Berlin, 1972), Ch. 8.
  7. P. K. Kaiser, P. A. Herzberg, and R. M. Boynton, Vision Res. 11, 953 (1971).
    [Crossref] [PubMed]

1973 (1)

1972 (2)

G. Wagner and R. M. Boynton, J. Opt. Soc. Am. 62, 1508 (1972).
[Crossref] [PubMed]

C. E. Sternheim, R. A. Glass, and J. V. Keller, Vision Res. 12, 1715 (1972).
[Crossref] [PubMed]

1971 (2)

P. K. Kaiser and T. S. Greenspon, J. Opt. Soc. Am. 61, 962 (1971).
[Crossref] [PubMed]

P. K. Kaiser, P. A. Herzberg, and R. M. Boynton, Vision Res. 11, 953 (1971).
[Crossref] [PubMed]

1968 (1)

R. M. Boynton and P. K. Kaiser, Science 161, 366 (1968).
[Crossref] [PubMed]

Boynton, R. M.

R. M. Boynton, J. Opt. Soc. Am. 63, 1037 (1973).
[Crossref] [PubMed]

G. Wagner and R. M. Boynton, J. Opt. Soc. Am. 62, 1508 (1972).
[Crossref] [PubMed]

P. K. Kaiser, P. A. Herzberg, and R. M. Boynton, Vision Res. 11, 953 (1971).
[Crossref] [PubMed]

R. M. Boynton and P. K. Kaiser, Science 161, 366 (1968).
[Crossref] [PubMed]

Fiorentini, A.

Thus we find evidence for Mach-band-like effects only at borders that result from both chromatic and achromatic imbalances. We are unable to verify the prediction that chromatic spatial separation alone is sufficient to elicit the phenomenon. See, e.g., A. Fiorentini, in Handbook of Sensory Physiology VII/4, Visual Psychophysics, edited by D. Jameson and L. M. Hurvich (Springer, Berlin, 1972), Ch. 8.

Glass, R. A.

C. E. Sternheim, R. A. Glass, and J. V. Keller, Vision Res. 12, 1715 (1972).
[Crossref] [PubMed]

Greenspon, T. S.

Herzberg, P. A.

P. K. Kaiser, P. A. Herzberg, and R. M. Boynton, Vision Res. 11, 953 (1971).
[Crossref] [PubMed]

Kaiser, P. K.

P. K. Kaiser, P. A. Herzberg, and R. M. Boynton, Vision Res. 11, 953 (1971).
[Crossref] [PubMed]

P. K. Kaiser and T. S. Greenspon, J. Opt. Soc. Am. 61, 962 (1971).
[Crossref] [PubMed]

R. M. Boynton and P. K. Kaiser, Science 161, 366 (1968).
[Crossref] [PubMed]

Keller, J. V.

C. E. Sternheim, R. A. Glass, and J. V. Keller, Vision Res. 12, 1715 (1972).
[Crossref] [PubMed]

Sternheim, C. E.

C. E. Sternheim, R. A. Glass, and J. V. Keller, Vision Res. 12, 1715 (1972).
[Crossref] [PubMed]

Wagner, G.

J. Opt. Soc. Am. (3)

Science (1)

R. M. Boynton and P. K. Kaiser, Science 161, 366 (1968).
[Crossref] [PubMed]

Vision Res. (2)

C. E. Sternheim, R. A. Glass, and J. V. Keller, Vision Res. 12, 1715 (1972).
[Crossref] [PubMed]

P. K. Kaiser, P. A. Herzberg, and R. M. Boynton, Vision Res. 11, 953 (1971).
[Crossref] [PubMed]

Other (1)

Thus we find evidence for Mach-band-like effects only at borders that result from both chromatic and achromatic imbalances. We are unable to verify the prediction that chromatic spatial separation alone is sufficient to elicit the phenomenon. See, e.g., A. Fiorentini, in Handbook of Sensory Physiology VII/4, Visual Psychophysics, edited by D. Jameson and L. M. Hurvich (Springer, Berlin, 1972), Ch. 8.

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Figures (4)

Fig. 1
Fig. 1

Thresholds across minimally distinct borders formed by juxtaposing white with five wavelengths plus white. Curves are arbitrarily displaced on the ordinate. Error bars show ±1 standard deviation. Subject FW.

Fig. 2
Fig. 2

Thresholds across minimally distinct borders formed by juxtaposing white with five wavelengths plus white. Curves are arbitrarily displaced on the ordinate. Error bars show ±1 standard deviation. Subject BT.

Fig. 3
Fig. 3

Thresholds across borders for which the radiance of the white field to the left of the border was twice that required for a MDB. The radiance of the white and chromatic fields to the right of the border is unchanged from Figs. 1 and 2. Subject FW.

Fig. 4
Fig. 4

Thresholds across borders for which the radiance of the white field to the left of the border was twice that required for a MDB. The radiance of the white and chromatic fields to the right of the border is unchanged from Figs. 1 and 2. Subject BT.