Variations in normal color vision. Factor analyses of the differences suggest they depend on multiple, narrowly-tuned factors. These factors are inconsistent with conventional models of color opponency. The factors may reflect led binary options elliott wave population code for color appearance.

We examined the basis of these individual differences by using factor analysis to examine the variations in hue-scaling functions from both new and previously published data. These proportions were converted to hue angles in a perceptual-opponent space defined by red vs. Factors were then extracted from the correlation matrix using PCA and Varimax rotation. This pattern was compared to factor analyses of Monte Carlo simulations of the individual differences in scaling predicted by variations in standard opponent mechanisms, such as their spectral tuning or relative sensitivity. The observed factor pattern is inconsistent with these models and thus with conventional accounts of color appearance based on the Hering primaries. Instead, our analysis points to a perceptual representation of color in terms of multiple mechanisms or decision rules that each influence the perception of only a relatively narrow range of hues, potentially consistent with a population code for color suggested by cortical physiology. Check if you have access through your login credentials or your institution.

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Justin Trudeau at the World Economic Forum in Switzerland in January. Isla Fisher attends Kate Spade at Masonic Hall. Subscribe for unlimited access to news. Return to the homepage by clicking on the site logo. This article has multiple issues.