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Chem. Senses 25: 493-499, 2000
© Oxford University Press 2000

Psychometrics of Odor Quality Discrimination: Method for Threshold Determination

Mats J. Olsson and William S. Cain1

Department of Psychology, Uppsala University, Box 1225, S-751 42 Uppsala, Sweden and 1 Chemosensory Perception Laboratory, University of California at San Diego, La Jolla, CA 92093-0957, USA

Correspondence to be sent to: Mats J. Olsson, Department of Psychology, Uppsala University, S-751 42 Uppsala, Sweden. e-mail: mats.olsson{at}psyk.uu.se

There is no natural physical continuum for odor quality along which an odor quality discrimination (OQD) threshold can be measured. In an attempt to overcome this problem, the substitution–reciprocity (SURE) method defines a framework for the measurement of an OQD threshold. More specifically, it (i) defines a threshold concept for OQD, including the quantification of qualitative change of the stimulus, and (ii) suggests how to avoid perceived intensity as an unwanted cue for discrimination. In doing this, the psychometric properties of odor quality in the case of eugenol and citral are investigated using both discrimination (experiment 1) and scaling (experiment 2). Based on discriminatory responses, a change of approximately one-third in stimulus content was needed to reach the OQD threshold for eugenol and citral.


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