This study demonstrates the application of a multidimensional scaling technique, known as INDSCAL, to determine the perceptual attributes of a group of non-normal voices. In this study, equal-appearing interval scale was used to obtain judgments of similarity for 20 speakers sustaining a vowel. For each speaker, six physical and three psychophysical measures were also obtained and used to interpret the INDSCAL solution. A five-dimensional solution was found to be the most appropriate solution for explaining the variance. The findings of the INDSCAL analysis suggest that there exist distinct perceptual features of the abnormal voice which have physical and psychophysical correlates. The strengths of the underlying dimensions of the voices appear to indicate that multidimensional scaling will be a valuable tool in the diagnosis of voice abnormalities.
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Murry et al. (1977) studied this question.