PSYCHOMETRIC CLASSIFICATION OF ODORS

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Abstract
In order to find the relationship among standard odors proposed by Amoore, Wright and Michels, Schutz, and Takagi et al., multivariate analyses were applied to the similarity judgment data among these odors. Twenty male subjects judged the similarity among 32 standard test odors and 40 representative essential oils. The data were processed both by principal component analysis (PCA) and multidimensional scaling (MDS) (both Torgerson's and Kruskals model). According to PCA, standard test stimuli proposed by Takagi et al., may be categorized into three groups. The first comprises of cycloten, skatol, and diallyl sulphide, the second comprises exaltolide, γ undecalactone, and phenol, while the third comprises β phenylethylacohol, camphor, acetic acid, and isovaleric acid. Multidimensional scaling yielded a slightly different classification. Referring to threshold values, physiological loads to subjects, and similarity judgment, an order of presentation in clinical diagnosis is recommended.

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