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Dissimilarity of yellow-blue surfaces under neutral light sources differing in intensity: Separate contributions of light intensity and chroma

Published online by Cambridge University Press:  03 July 2008

RUMI TOKUNAGA ,
ALEXANDER D. LOGVINENKO  and
LAURENCE T. MALONEY
RUMI TOKUNAGA*
Affiliation:
Department of Vision Sciences, Glasgow Caledonian University, Glasgow, United Kingdom
ALEXANDER D. LOGVINENKO
Affiliation:
Department of Vision Sciences, Glasgow Caledonian University, Glasgow, United Kingdom
LAURENCE T. MALONEY
Affiliation:
Department of Psychology & Center for Neural Science, New York University, New York, New York
*
Address correspondence and reprint requests to: Rumi Tokunaga, Department of Vision Sciences, Glasgow Caledonian University, 70 Cowcadden Road, G4 0BA, Glasgow, UK. E-mail: [email protected]
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Abstract

Observers viewed two side-by-side arrays each of which contained three yellow Munsell papers, three blue, and one neutral Munsell. Each array was illuminated uniformly and independently of the other. The neutral light source intensities were 1380, 125, or 20 lux. All six possible combinations of light intensities were set as illumination conditions. On each trial, observers were asked to rate the dissimilarity between each chip in one array and each chip in the other by using a 30-point scale. Each pair of surfaces in each illumination condition was judged five times. We analyzed this data using non-metric multi-dimensional scaling to determine how light intensity and surface chroma contributed to dissimilarity and how they interacted. Dissimilarities were captured by a three-dimensional configuration in which one dimension corresponded to differences in light intensity.

Keywords

Colour visionMunsell papersDissimilarityMultidimensional scalingSurface-brightness
Type
Research Article
Information
Visual Neuroscience , Volume 25 , Issue 3 , May 2008 , pp. 395 - 398
Copyright
Copyright © Cambridge University Press 2008

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References

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