August 2010
Volume 10, Issue 7
Free
Vision Sciences Society Annual Meeting Abstract  |   August 2010
Desaturated color scaling does not depend on color context: an MLDS experiment
Author Affiliations
  • Delwin Lindsey
    Department of Psychology, Ohio State University
  • Angela Brown
    College of Optometry, Ohio State University
Journal of Vision August 2010, Vol.10, 404. doi:10.1167/10.7.404
  • Views
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to Subscribers Only
      Sign In or Create an Account ×
    • Get Citation

      Delwin Lindsey, Angela Brown; Desaturated color scaling does not depend on color context: an MLDS experiment. Journal of Vision 2010;10(7):404. doi: 10.1167/10.7.404.

      Download citation file:


      © ARVO (1962-2015); The Authors (2016-present)

      ×
  • Supplements
Abstract

Previous work showed that visual search for desaturated targets among heterogeneous arrays of white and saturated distractors, of the same hue as their target, is governed by low-level color-opponent responses (Kuzmova, VSS, 2008). Is this a local effect, involving mechanisms that directly process the color signals arising from the targets themselves? Or is it more complex, perhaps involving relatively global perceptual processes that are governed by their low-level inputs? To investigate this question, we asked whether the distractors in the original search experiment influenced the color appearance of the targets. We presented reddish test stimuli of varying saturation and lightness (including the target that was found fastest in the search experiment) and a similar range of tritan-purplish stimuli (including the slowest target), in three color-context conditions: (1) a mixed “distractor” set of 60 red and white squares, (2) a similar set of purple and white squares, and (3) no squares (just the dark surrounding field). We assessed the color appearance of test stimuli, as a function of saturation, using Maximum Likelihood Difference Scaling. Test stimuli fell at equal δE intervals, along two lines in CIELAB, passing through red (10 cd/m2) and white (50 cd/m2), and white and purple (9 cd/m2), respectively. Three subjects (two naïve) viewed randomly-selected quadruples of 1-deg. colored squares displayed in the center of a color CRT. On each trial, subjects judged whether the top or the bottom pair of test stimuli had the larger color difference. We found no systematic difference in scaled hue across the three color-context conditions. Thus, the distractors in the original search experiment apparently did not influence the color appearance of the target stimuli. This result reinforces our previous conclusion that visual search engages local, low-level color opponent channels when desaturated targets are embedded in heterogeneous distractor arrays.

Lindsey, D. Brown, A. (2010). Desaturated color scaling does not depend on color context: an MLDS experiment [Abstract]. Journal of Vision, 10(7):404, 404a, http://www.journalofvision.org/content/10/7/404, doi:10.1167/10.7.404. [CrossRef]
Footnotes
 NIH R21EY018321.
×
×

This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.

×