May 2008
Volume 8, Issue 6
Free
Vision Sciences Society Annual Meeting Abstract  |   May 2008
Chromatic appearance depends on the rate of change of the colour signal (the “slew” rate)
Author Affiliations
  • Andrew Stockman
    Institute of Ophthalmology, University College London
  • Hannah Smithson
    Department of Psychology, Durham University
  • Jonathan Aboshiha
    Institute of Ophthalmology, University College London
  • Peter West
    Institute of Ophthalmology, University College London
  • Caterina Ripamonti
    Institute of Ophthalmology, University College London
Journal of Vision May 2008, Vol.8, 1098. doi:10.1167/8.6.1098
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      Andrew Stockman, Hannah Smithson, Jonathan Aboshiha, Peter West, Caterina Ripamonti; Chromatic appearance depends on the rate of change of the colour signal (the “slew” rate). Journal of Vision 2008;8(6):1098. doi: 10.1167/8.6.1098.

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Abstract

At low to moderate flicker frequencies (6 to 13 Hz), the overall mean colour appearances of M- and L-cone-isolating sawtooth stimuli depend on whether the direction of the sawtooth is rapid-on (slowly-off) or rapid-off (slowly-on). Rapid-on-L-cone and rapid-off-M-cone sawtooth stimuli appear greener, while rapid-off-L-cone and rapid-on-M-cone sawtooth stimuli appear redder, even though they have the same mean chromaticities. These changes can be explained by supposing that chromatic mechanisms are better able to track the slowly changing part of the sawtooth than its quickly changing part. Thus, their mean output will always be skewed in the direction of the slow change. By investigating how chromatic detection and discrimination depends on the slopes and amplitudes of the sawtooth waveforms, we can understand more about the temporal properties of the underlying chromatic mechanisms. Our findings are inconsistent with models of red-green opponent colour processing that incorporate only simple filters or nonlinearities. However, they are broadly consistent with models that are limited by a maximum rate of change in the colour signal from red to green or vice versa (i.e., the colour change is “slew-rate-limited”) preceded by a stage of temporal integration.

Stockman, A. Smithson, H. Aboshiha, J. West, P. Ripamonti, C. (2008). Chromatic appearance depends on the rate of change of the colour signal (the “slew” rate) [Abstract]. Journal of Vision, 8(6):1098, 1098a, http://journalofvision.org/8/6/1098/, doi:10.1167/8.6.1098. [CrossRef]
Footnotes
 BBSRC, Fight for Sight.
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