Effect of Relative Amplitude and Formant Transitions on Perception of Place of Articulation by Adult Listeners With Cochlear Implants Previous studies have shown that manipulation of a particular frequency region of the consonantal portion of a syllable relative to the amplitude of the same frequency region in an adjacent vowel influences the perception of place of articulation. This manipulation has been called the relative amplitude cue. Earlier studies have ... Research Article
Research Article  |   December 01, 1997
Effect of Relative Amplitude and Formant Transitions on Perception of Place of Articulation by Adult Listeners With Cochlear Implants
 
Author Affiliations & Notes
  • Mark S. Hedrick, PhD
    Boys Town National Research Hospital Omaha, NE
    Department of Audiology and Speech Pathology, 457 South Stadium Hall, University of Tennessee, Knoxville, TN 37996
  • Arlene Earley Carney
    Boys Town National Research Hospital Omaha, NE
  • Currently affiliated with the University of Tennessee, Knoxville.
    Currently affiliated with the University of Tennessee, Knoxville.×
  • Currently affiliated with the University of Minnesota, Minneapolis.
    Currently affiliated with the University of Minnesota, Minneapolis.×
Article Information
Hearing Aids, Cochlear Implants & Assistive Technology / Speech, Voice & Prosody / Hearing / Research Articles
Research Article   |   December 01, 1997
Effect of Relative Amplitude and Formant Transitions on Perception of Place of Articulation by Adult Listeners With Cochlear Implants
Journal of Speech, Language, and Hearing Research, December 1997, Vol. 40, 1445-1457. doi:10.1044/jslhr.4006.1445
History: Received November 19, 1996 , Accepted June 25, 1997
 
Journal of Speech, Language, and Hearing Research, December 1997, Vol. 40, 1445-1457. doi:10.1044/jslhr.4006.1445
History: Received November 19, 1996; Accepted June 25, 1997

Previous studies have shown that manipulation of a particular frequency region of the consonantal portion of a syllable relative to the amplitude of the same frequency region in an adjacent vowel influences the perception of place of articulation. This manipulation has been called the relative amplitude cue. Earlier studies have examined the effect of relative amplitude and formant transition manipulations upon labeling place of articulation for fricatives and stop consonants in listeners with normal hearing. The current study sought to determine if (a) the relative amplitude cue is used by adult listeners wearing a cochlear implant to label place of articulation, and (b) adult listeners wearing a cochlear implant integrated the relative amplitude and formant transition information differently than listeners with normal hearing. Sixteen listeners participated in the study, 12 with normal hearing and 4 postlingually deafened adults wearing the Nucleus 22 electrode Mini Speech Processor implant with the multipeak processing strategy. The stimuli used were synthetic consonant-vowel (CV) syllables in which relative amplitude and formant transitions were manipulated. The two speech contrasts examined were the voiceless fricative contrast /s/-/∫/and the voiceless stop consonant contrast /p/-/t/. For each contrast, listeners were asked to label the consonant sound in the syllable from the two response alternatives. Results showed that (a) listeners wearing this implant could use relative amplitude to consistently label place of articulation, and (b) listeners with normal hearing integrated the relative amplitude and formant transition information more than listeners wearing a cochlear implant, who weighted the relative amplitude information as much as 13 times that of the transition information.

Acknowledgments
This research was supported in part by grants from the National Institutes of Health. We thank Dr. Edward Carney, Robert Sullivan, and Dr. Richard Fahey for their computer software assistance, and the listeners who participated in this experiment. In addition, we thank Drs. Michael Berbaum, Christopher Turner, Richard Tyler, Fan-Gang Zeng, and Sandra Gordon-Salant for their contributions to the manuscript.
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