Chromatic induction and the locus of unique yellow as a function of stimulus illuminance

Laura Sewall, Brooke E. Schefrin, John S Werner

Research output: Contribution to journalArticlepeer-review


Chromatic induction was measured in terms of the wavelength of a central 1°, unique yellow field surrounded by annuli that varied in wavelength, area, contrast, and overall retinal illuminance. In the first experiment, a 1.3° surround was varied from approximately 470 to 670 nm, using an overall illuminance range from 0.5 to 4.0 log trolands. The illuminance contrast between the center and surround was 1.0 (i.e., isoluminant). The results indicated that the wavelength of unique yellow shifted in the direction of the wavelength of the surround at all intensities. The magnitude of the shift, however, decreased with increasing intensity for middle‐ and long‐wavelength surrounds. The latter result was not expected from previous research. Experiment 2 tested the hypothesis that this might be due to a Bezold‐Brücke effect in which the hue of the surround changes with increasing retinal illuminance. The relative influence of Bezold‐Brücke hue shifts on chromatic induction was manipulated by changing surround area and luminance contrast. Results of this experiment were consistent with the hypothesis that changes in color appearance with increases in intensity may influence the magnitude of chromatic induction.

Original languageEnglish (US)
Pages (from-to)251-257
Number of pages7
JournalColor Research and Application
Issue number4
StatePublished - 1991
Externally publishedYes

ASJC Scopus subject areas

  • Human Factors and Ergonomics
  • Chemistry(all)
  • Chemical Engineering(all)


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