Evidence that numerical estimates of subjective ratios may be numerical ratings of subjective differences

The hypothesis that people can make non-learned numerical estimates of ratios of subjective magnitude is still unverified after over more than a century of research. Participants were asked to numerically estimate brightness ratios of pairs of surfaces whose luminances were combined factorially. With one luminance in a pair as the parameter, the ability to estimate ratios numerically predicts that the plotting of numerical estimates against the other luminance yields diverging [...]

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