Relationship of Spectral Noise Levels to Psychophysical Scaling of Vowel Roughness Direct magnitude estimation (DME) and equal-appearing interval (EAI) ratings of perceived roughness and spectral noise level (SNL) measurements of isolated sustained vowel samples (/a/ and /i/) were obtained. The linear and curvilinear relationships between the resulting roughness ratings and SNL were then examined. In the present study, the comparison between ... Research Article
Research Article  |   June 01, 1990
Relationship of Spectral Noise Levels to Psychophysical Scaling of Vowel Roughness
 
Author Affiliations & Notes
  • Mary Ann Toner
    University of Wyoming, Laramie
  • Floyd W. Emanuel
    University of Oklahoma, Oklahoma City
  • Donald Parker
    University of Oklahoma, Oklahoma City
  • Requests should be sent to Mary Ann Toner, University of Wyoming, Box 3311, University Station, Laramie, WY 82071-3311.
Article Information
Research Articles
Research Article   |   June 01, 1990
Relationship of Spectral Noise Levels to Psychophysical Scaling of Vowel Roughness
Journal of Speech, Language, and Hearing Research, June 1990, Vol. 33, 238-244. doi:10.1044/jshr.3302.238
History: Received February 21, 1989 , Accepted November 28, 1989
 
Journal of Speech, Language, and Hearing Research, June 1990, Vol. 33, 238-244. doi:10.1044/jshr.3302.238
History: Received February 21, 1989; Accepted November 28, 1989

Direct magnitude estimation (DME) and equal-appearing interval (EAI) ratings of perceived roughness and spectral noise level (SNL) measurements of isolated sustained vowel samples (/a/ and /i/) were obtained. The linear and curvilinear relationships between the resulting roughness ratings and SNL were then examined. In the present study, the comparison between the two models resulted in conflicting evidence regarding the model that best described the relationship between roughness ratings and SNL measurements. In all comparisons, however, a significant linear component was indicated. Additionally, when a significant curvilinear component was indicated, the difference between the lines and curves that were fit to the data was minimal. The present findings suggest, therefore, that a high degree of linearity exists between both DME and EAI roughness ratings and SNL.

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