A ratio scale for brightness perception derived from difference and ratio judgments

H. Ridder, de

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

    Abstract

    The often observed nonlinearity between magnitude estimations and category ratings has raised the question whether subjects can judge sensation differences as well as sensation ratios when instructed to do so. For brightness this will be shown to be the case; the rank order of difference judgments differs from the rank order of ratio judgments. Nonmetric analysis of these rankings yields a ratio scale for brightness perception that is (1) a power function of luminance (power: 0.13), (2) linearly related to direct category ratings, (3) nonlinearly related to direct magnitude estimations. Implications for the nonlinearity between magnitude estimations and category ratings are discussed.
    Original languageEnglish
    Title of host publicationAbstracts of te XXV International Congress of Psychology, July 19-24 1992, Brussels, Belgium
    EditorsM. Sabourin
    PublisherUnion Internationale de Psychology Scientifique
    Pages33
    Number of pages1
    Publication statusPublished - 1992

    Publication series

    NameInternational journal of psychology
    Number3/4
    Volume27
    ISSN (Print)0020-7594

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