December 2005
Volume 5, Issue 12
OSA Fall Vision Meeting Abstract  |   December 2005
Physiological correlates for the watercolor effect
Author Affiliations
  • Sarah L. Elliott
    University of Nevada, Reno
  • Jennifer R. Highsmith
    University of Nevada, Reno
  • Samuel D. Crognale
    University of Nevada, Reno
  • Michael A. Crognale
    University of Nevada, Reno
Journal of Vision December 2005, Vol.5, 58. doi:
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      Sarah L. Elliott, Jennifer R. Highsmith, Samuel D. Crognale, Michael A. Crognale; Physiological correlates for the watercolor effect. Journal of Vision 2005;5(12):58.

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

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Introduction: The watercolor effect is a long-range color assimilation that appears to be related to luminance dependent color mechanisms in the cortex (Devinck et al. 2005). The present study used a chromatic pattern onset VEP to test whether physiological correlates to the long-range color assimilation produced by the watercolor effect can be found.

Methods: Pattern onset VEPs were recorded for two separate stimuli, one producing the watercolor assimilation, and one not. Both stimuli consisted of 1 cycle per degree (0.5° peak-to-trough amplitude) sinusoidal contour and flanker lines separated by 2.5 degrees of visual angle. For the non-assimilation stimuli, flanker lines were moved 0.5° away from contour lines.

Results: The negative CII component elicited from the assimilation condition was on average 20ms shorter than the CII component elicited by the non-assimilation condition. The CIII component also had consistently larger amplitude and shorter latency in the assimilation condition.

Conclusion: Changes in the components in the pattern-onset VEP waveform provide evidence for consistent physiological correlates of the long-range color assimilation produced with the watercolor effect.

Elliott, S. L. Highsmith, J. R. Crognale, S. D. Crognale, M. A. (2005). Physiological correlates for the watercolor effect [Abstract]. Journal of Vision, 5(12):58, 58a,, doi:10.1167/5.12.58. [CrossRef] [PubMed]

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