Multidimensional classification of abnormal voice qualities

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Abstract
The application of a multidimensional scaling technique, known as INDSCAL, to determine the perceptual attributes of a group of non-normal voices was demonstrated. An equal-appearing interval scale was used to obtain judgments of similarity for 20 speakers sustaining a vowel. For each speaker, 6 physical and 3 psychophysical measures were also obtained and used to interpret the INDSCAL solution. A 5-dimensional solution was the most appropriate solution for explaining the variance. The INDSCAL analysis suggested 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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