June 2007
Volume 7, Issue 9
Free
Vision Sciences Society Annual Meeting Abstract  |   June 2007
Very-long-term chromatic adaption from short-term adapting stimulation
Author Affiliations
  • Suzanne Belmore
    Visual Science Laboratories, University of Chicago
  • Steven Shevell
    Visual Science Laboratories, University of Chicago
Journal of Vision June 2007, Vol.7, 457. doi:10.1167/7.9.457
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      Suzanne Belmore, Steven Shevell; Very-long-term chromatic adaption from short-term adapting stimulation. Journal of Vision 2007;7(9):457. doi: 10.1167/7.9.457.

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Abstract

PURPOSE: A new technique for establishing very-long-term (VLT) chromatic adaptation (over days and weeks) was assessed and compared to the classical approach. Shifts in equilibrium yellow were measured following VLT adaptation to either long-wavelength room illumination for several hours per day (classical paradigm) or to a long-wavelength CRT pattern for 1 hour per day. The aim was to test whether the briefer CRT pattern produced VLT chromatic adaptation comparable to that invoked by longer-lasting illumination.

METHODS: (a) Both means of adaptation used a long-wave reddish-appearing light. In the classical condition, the subject spent 4 hours/day in a windowless room in which overhead light passed through a filter that allowed only 5% transmittance of wavelengths below 540nm (Judd x = 0.408, y = 0.420). In the new method, the subject viewed a moving grating composed of only the R phosphor of a CRT monitor (Judd x = 0.598, y = 0.345) for 1 hour per day. [We thank Dr. J. Neitz of the Medical College of Wisconsin, who suggested this approach to us.] (b) Measurements to assess color perception were performed either 22 hours (CRT) or 19 hours (room illumination) after the most recent adapting period. The subject set an admixture of 540nm-plus-660nm light to appear equilibrium yellow at 4 luminance levels between 3 and 100 trolands.

RESULTS: Both methods of chromatic adaptation produced VLT shifts in the chromaticity of equilibrium yellow as well as similar shifts back toward baseline during the 2-week post-adaptation recovery period.

CONCLUSION: Viewing a chromatic grating for 1 hour/day produces very-long-term chromatic adaptation. The CRT adapting stimulus has the following advantages over room illumination: the VLT adapting stimulation can be (1) retinotopically localized, (2) dichoptic (unequal in the two eyes) and (3) precisely controlled with respect to chromaticity and cone stimulation.

Belmore, S. Shevell, S. (2007). Very-long-term chromatic adaption from short-term adapting stimulation [Abstract]. Journal of Vision, 7(9):457, 457a, http://journalofvision.org/7/9/457/, doi:10.1167/7.9.457.
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