Journal of Speech, Language, and Hearing Research Vol.54 727-739 June 2011. doi:10.1044/1092-4388(2010/09-0256)
© American Speech-Language-Hearing Association
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Article

The Influence of Auditory Acuity on Acoustic Variability and the Use of Motor Equivalence During Adaptation to a Perturbation

Jana Brunnera
Satrajit Ghosha
Philip Hooleb
Melanie Matthiesc
Mark Tiedea,,d
Joseph Perkella
a Speech Communication Group, Massachusetts Institute of Technology, Cambridge, MA
b Institut für Phonetik und Sprachverarbeitung, Ludwig-Maximilians-Universität München, Munich, Germany
c Department of Speech, Language and Hearing Sciences, Boston University, MA
d Haskins Laboratories, New Haven, CT

Correspondence to Jana Brunner: jana.brunner{at}uni-potsdam.de

Purpose: The aim of this study was to relate speakers' auditory acuity for the sibilant contrast, their use of motor equivalent trading relationships in producing the sibilant /esh/, and their produced acoustic distance between the sibilants /s/ and /esh/. Specifically, the study tested the hypotheses that during adaptation to a perturbation of vocal-tract shape, high-acuity speakers use motor equivalence strategies to a greater extent than do low-acuity speakers in order to reach their smaller phonemic goal regions, and that high-acuity speakers produce greater acoustic distance between 2 sibilant phonemes than do low-acuity speakers.

Method: Articulographic data from 7 German speakers adapting to a perturbation were analyzed for the use of motor equivalence. The speakers' produced acoustic distance between /s/ and /esh/ was calculated. Auditory acuity was assessed for the same speakers.

Results: High-acuity speakers used motor equivalence to a greater extent when adapting to a perturbation than did low-acuity speakers. Additionally, high-acuity speakers produced greater acoustic contrasts than did low-acuity-speakers. It was observed that speech rate had an influence on the use of motor equivalence: Slow speakers used motor equivalence to a lesser degree than did fast speakers.

Conclusion: These results provide support for the mutual interdependence of speech perception and production.

KEY WORDS: articulation, palate, speech sound, speech intelligibility


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J. Brunner and P. Hoole
Motor Equivalent Strategies in the Production of German /{int}/ under Perturbation
Language and Speech, December 1, 2012; 55(4): 457 - 476.
[Abstract] [PDF]