Loci of spectral unique hues throughout the life span.

B. E. Schefrin, John S Werner

Research output: Contribution to journalArticlepeer-review

97 Scopus citations


Spectral unique hues (blue, green, and yellow) were determined for 50 observers ranging in age from 13 to 74 years. Each unique hue was measured at three luminance levels (0.5-log-unit steps). There were no significant changes in the spectral locations of red-green equilibrium hues (unique blue and yellow) as a function of luminance level or age. In contrast, significant shifts in unique green loci occurred as a function of both age and luminance. Unique green loci shifted toward shorter wavelengths with age. These results are consistent with the hypothesis that with advancing age there is a parallel decline in the input of all three cone types to the red-green chromatic channel and either a selective decline in short-wave-sensitive cone input to the yellow-blue chromatic channel or a change in the way in which cone signals are combined within the yellow-blue channel.

Original languageEnglish (US)
Pages (from-to)305-311
Number of pages7
JournalJournal of the Optical Society of America. A, Optics and image science
Issue number2
StatePublished - Feb 1990
Externally publishedYes

ASJC Scopus subject areas

  • Computer Vision and Pattern Recognition


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