Empirical evaluation of the near-miss-to-Weber’s law: a visual discrimination experiment

Psychology Science Quarterly. 2008;50(4):469-488

 

Journal Homepage

Journal Title: Psychology Science Quarterly

ISSN: 1866-6140 (Print)

Publisher: Pabst Science Publishers

LCC Subject Category: Philosophy. Psychology. Religion: Psychology

Country of publisher: Germany

Language of fulltext: English

 

AUTHORS

THOMAS AUGUSTIN
TANJA ROSCHER

EDITORIAL INFORMATION

 

Abstract | Full Text

Many pure tone intensity discrimination data support the hypothesis that the sensitivity function grows as a power function of the stimulus intensity (near-miss-to-Weber's law). In order to test whether the near-miss-to-Weber's law fits empirical data from other sensory modalities than hearing, the participants of the experiment had to compare the perceived area of squares presented on a computer screen. The results indicate an almost perfect fit of the near-miss-to-Weber's law, which is in line with many pure tone intensity discrimination data. Different from a recent study on psychoacoustics, however, the exponent in the near-miss-to-Weber's law does not vary with the criterion value used to define “just-noticeably different”. Furthermore, we provide evidence that, for a majority of the participants, Weber's classical law provides an equally good fit to the data as the near-miss-to-Weber's law.