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The Measurement of Sensation$
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Donald Laming

Print publication date: 1997

Print ISBN-13: 9780198523420

Published to Oxford Scholarship Online: January 2008

DOI: 10.1093/acprof:oso/9780198523420.001.0001

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Matching just-noticeable differences

Matching just-noticeable differences

(p.108) 8 Matching just-noticeable differences
The Measurement of Sensation

Donald Laming

Oxford University Press

Different stimulus continua have different Weber fractions. If Weber's Law holds, matching jnds across continua generates a power law relation. If numbers be regarded as an artificial continuum, Stevens' Power Law results; so too does Ekman's Law (Weber's Law applied to sensation). This chapter looks at the relationship between the Weber fraction and the power law exponent, at the magnitude estimation of 1 kHz tones (a stimulus continuum that deviates from Weber's Law), and at the precision of magnitude estimates in relation to thresholds. The idea that the power law results from a matching of jnds across continua cannot be sustained.

Keywords:   Ekman's Law, power law exponent, precision, Stevens' Power Law, thresholds, Weber fraction, Weber's Law

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