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The Psychological Record

, Volume 59, Issue 2, pp 171–185 | Cite as

Does Stevens’s Power Law for Brightness Extend to Perceptual Brightness Averaging?

  • Ben BauerEmail author
Article

Abstract

Stevens’s power law (Ψ∝Φß) captures the relationship between physical (Φ) and perceived (Ψ) magnitude for many stimulus continua (e.g., luminance and brightness, weight and heaviness, area and size). The exponent (ß) indicates whether perceptual magnitude grows more slowly than physical magnitude (ß < 1), directly as physical magnitude (ß ≈ 1), or more quickly than physical magnitude (ß > 1). These exponents are typically determined using judgments of single stimuli. Miller and Sheldon (1969) found that the validity of Stevens’s Power Law could be extended to the case where the mean of a property in an ensemble of items was judged (i.e., average length or average tilt where ß ≈ 1). The present experiments investigate the extension of this finding to perceived brightness with ß ≈ 0.33 and find evidence consistent with predictions made by Miller and Sheldon.

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Copyright information

© Association of Behavior Analysis International 2009

Authors and Affiliations

  1. 1.Dept. of PsychologyTrent University OshawaOshawaCanada

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