Direct Magnitude Estimation and Interval Scaling of Naturalness and Severity in Tracheoesophageal (TE) Speakers The purpose of this study was to determine the psychophysical character and validity of auditory-perceptual ratings of naturalness and overall severity for tracheoesophageal (TE) speech. This was achieved through use of direct magnitude estimation (DME) and equal-appearing interval (EAI) scaling procedures. Twenty adult listeners judged speech naturalness and overall severity ... Research Article
Research Article  |   December 01, 2002
Direct Magnitude Estimation and Interval Scaling of Naturalness and Severity in Tracheoesophageal (TE) Speakers
 
Author Affiliations & Notes
  • Tanya L. Eadie, MSc
    School of Communication Sciences and Disorders Elborn College University of Western Ontario London, Ontario, Canada
  • Philip C. Doyle
    School of Communication Sciences and Disorders Elborn College University of Western Ontario London, Ontario, Canada
  • Contact author: Tanya L. Eadie, MSc, Voice Production Laboratory, School of Communication Sciences and Disorders, University of Western Ontario, London, Ontario N6G 1H1, Canada. E-mail: teadie@uwo.ca
Article Information
Speech, Voice & Prosodic Disorders / Voice Disorders / Speech, Voice & Prosody / Speech / Research Articles
Research Article   |   December 01, 2002
Direct Magnitude Estimation and Interval Scaling of Naturalness and Severity in Tracheoesophageal (TE) Speakers
Journal of Speech, Language, and Hearing Research, December 2002, Vol. 45, 1088-1096. doi:10.1044/1092-4388(2002/087)
History: Received March 18, 2002 , Accepted June 17, 2002
 
Journal of Speech, Language, and Hearing Research, December 2002, Vol. 45, 1088-1096. doi:10.1044/1092-4388(2002/087)
History: Received March 18, 2002; Accepted June 17, 2002
Web of Science® Times Cited: 23

The purpose of this study was to determine the psychophysical character and validity of auditory-perceptual ratings of naturalness and overall severity for tracheoesophageal (TE) speech. This was achieved through use of direct magnitude estimation (DME) and equal-appearing interval (EAI) scaling procedures. Twenty adult listeners judged speech naturalness and overall severity from connected speech samples produced by 20 adult male TE speakers. A comparison of DME- and EAI-scaled judgments yielded a metathetic continuum for naturalness and a prothetic continuum for overall severity. These data provide support for the use of either DME or EAI scales in auditory-perceptual ratings of naturalness, but they provide support only for DME scales in judging overall severity for TE speech. The present results suggest that the nature of perceptual phenomena (prothetic vs. metathetic) for TE speakers is consistent with findings for the same dimensions produced by normal laryngeal speakers. These data also support a need for further study of perceptual dimensions associated with TE voice and speech in order to avoid the inappropriate and invalid use of EAI scales frequently found in diagnosis, assessment, and evaluation of this clinical population.

Acknowledgments
This paper was written in partial fulfillment of the thesis requirements for obtaining a PhD in Rehabilitation Sciences at the University of Western Ontario. The authors wish to acknowledge the continued support of the Harmonize for Speech Fund, the Ontario Barbershop Association, and the Canadian Institutes of Health Research (CIHR).
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