September 2005
Volume 5, Issue 8
Free
Vision Sciences Society Annual Meeting Abstract  |   September 2005
Induction from a chromatic pattern that cannot be seen
Author Affiliations
  • Patrick Monnier
    Florida Atlantic University, Department of Psychology, Jupiter, FL 33458, USA
  • Steven K. Shevell
    Visual Science Laboratories, University of Chicago, Chicago, IL 60637, USA
  • Erica J. Young
    Florida Atlantic University, Honors College, Jupiter, FL 33458, USA
Journal of Vision September 2005, Vol.5, 98. doi:10.1167/5.8.98
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      Patrick Monnier, Steven K. Shevell, Erica J. Young; Induction from a chromatic pattern that cannot be seen. Journal of Vision 2005;5(8):98. doi: 10.1167/5.8.98.

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Abstract

BACKGROUND: Patterns with regions alternating between two chromaticities can induce large shifts in color appearance (Monnier & Shevell, 2003, Nature Neuroscience). Reliable shifts occur even with patterns having S-cone contrast of only 10%. Here we consider whether an inducing pattern with contrast so low that it cannot be perceived still induces color shifts.

METHODS: In a preliminary experiment, threshold for S-cone contrast in a pattern was measured by a 2AFC staircase procedure. A non-signal interval contained 2 identical uniform achromatic backgrounds, presented side by side. A signal interval contained one uniform achromatic background and one patterned background (3 cpd) with inducing circles alternating between higher S-cone (toward purple) and lower S-cone stimulation (toward lime). In the main experiment, a centrally located test ring was inserted in all the backgrounds. The chromaticity of the test was chosen from previous work that showed strong induction from high contrast S-cone patterns. The task was to choose the interval in which the two backgrounds were different.

RESULTS: With the test ring in the patterns, each of 4 observers could reliably distinguish the signal from the non-signal interval at an S-cone contrast too low to be detected in the preliminary experiment without the test ring.

CONCLUSIONS: A test ring within an inducing pattern with S-cone contrast can be distinguished from a test ring within a uniform background, even when contrast in the pattern is below threshold. The results are consistent with an induced color shift from a chromatic pattern that cannot be perceived.

Monnier, P. Shevell, S. K. Young, E. J. (2005). Induction from a chromatic pattern that cannot be seen [Abstract]. Journal of Vision, 5(8):98, 98a, http://journalofvision.org/5/8/98/, doi:10.1167/5.8.98. [CrossRef]
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