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Journal of Speech and Hearing Research Vol.39 936-946 October 1996.
© American Speech-Language-Hearing Association
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Acoustic and Articulatory Measures of Sibilant Production With and Without Auditory Feedback From a Cochlear Implant

Melanie L. Matthies 1
Mario Svirsky 2
Joseph Perkell 3

Harlan Lane 4
1 Massachusetts Institute of Technology Research Laboratory of Electronics Cambridge and Department of Communication Disorders Sargent College of Allied Health Professions Boston University
2 Massachusetts Institute of Technology Research Laboratory of Electronics Cambridge
3 Massachusetts Institute of Technology Research Laboratory of Electronics and Department of Brain and Cognitive Sciences Cambridge
4 Massachusetts Institute of Technology Research Laboratory of Electronics Cambridge and Department of Otolaryngology Massachusetts Eye and Ear Infirmary and Harvard Medical School and Northeastern University Boston

melanie{at}speech.mit.edu

The articulator positions of a subject with a cochlear implant were measured with an electromagnetic midsagittal articulometer (EMMA) system with and without auditory feedback available to the subject via his implant. Acoustic analysis of sibilant productions included specific measures of their spectral properties as well as the F3 formant amplitude. More general postural characteristics of the utterances, such as speech rate and sound level, were measured as well. Because of the mechanical and aerodynamic interdependence of the articulators, the postural variables must be considered before attributing speech improvement to the selective correction of a phonemic target with the use of auditory feedback. The tongue blade position was related to the shape and central tendency of the /int/ spectra; however, changes in the spectral contrast between /s/ and /int/ were not related to changes in the more general postural variables of rate and sound level. These findings suggest that the cochlear implant is providing this subject with important auditory cues that he can use to monitor his speech and maintain the phonemic contrast between /s/ and /int/.

KEY WORDS: cochlear implant, deafness, auditory feedback, articulometer

Submitted on July 5, 1995
Accepted on May 2, 1996


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