Identification and Multiplicity of Double Vowels in Cochlear Implant Users Purpose The present study examined cochlear implant (CI) users' perception of vowels presented concurrently (i.e., double vowels) to further our understanding of auditory grouping in electric hearing. Method Identification of double vowels and single vowels was measured with 10 CI subjects. Fundamental frequencies (F0s) of vowels were either 100 ... Research Article
Research Article  |   October 01, 2014
Identification and Multiplicity of Double Vowels in Cochlear Implant Users
 
Author Affiliations & Notes
  • Bomjun J. Kwon
    Gallaudet University, Washington, DC
  • Trevor T. Perry
    Gallaudet University, Washington, DC
  • Disclosure: The authors have declared that no competing interests existed at the time of publication.
    Disclosure: The authors have declared that no competing interests existed at the time of publication.×
  • Correspondence to Bomjun J. Kwon: bomjun.kwon@gallaudet.edu
  • Editor: Craig Champlin
    Editor: Craig Champlin×
  • Associate Editor: Kathryn Arehart
    Associate Editor: Kathryn Arehart×
Article Information
Hearing Aids, Cochlear Implants & Assistive Technology / Hearing / Research Articles
Research Article   |   October 01, 2014
Identification and Multiplicity of Double Vowels in Cochlear Implant Users
Journal of Speech, Language, and Hearing Research, October 2014, Vol. 57, 1983-1996. doi:10.1044/2014_JSLHR-H-12-0410
History: Received December 20, 2012 , Revised September 17, 2013 , Accepted April 28, 2014
 
Journal of Speech, Language, and Hearing Research, October 2014, Vol. 57, 1983-1996. doi:10.1044/2014_JSLHR-H-12-0410
History: Received December 20, 2012; Revised September 17, 2013; Accepted April 28, 2014

Purpose The present study examined cochlear implant (CI) users' perception of vowels presented concurrently (i.e., double vowels) to further our understanding of auditory grouping in electric hearing.

Method Identification of double vowels and single vowels was measured with 10 CI subjects. Fundamental frequencies (F0s) of vowels were either 100 + 100 Hz or 100 + 300 Hz. Vowels were presented either synchronously or with a time delay. In “Double” sessions, subjects were given only double vowels. In “Double + Single” sessions, while double and single vowels were presented, subjects reported the number and identity of the vowel(s). In addition to clinical settings, stimuli were delivered via an experimental method that interleaved pulse streams of two vowels.

Results Although the time delay between vowels had a large effect on identification, the effect of change in fundamental frequency (ΔF0) was modest. Enumeration was poor in general, and identification of synchronous vowels was above chance in only the Double sessions with a priori knowledge about presentation. Interleaved presentation of vowel streams provided no benefit for identification and a marginal benefit for enumeration.

Conclusions The results demonstrate the importance of episodic context for CI users. Unreliable perception of multiplicity observed in the present results suggests that auditory grouping in CIs may be driven by a schema-based process.

Acknowledgments
This study was funded, in part, by National Institute on Deafness and Other Communication Disorders Grant R03 DC009061 and by The Ohio State University Medical Center. A portion of data included in this report was presented at the 35th Mid-Winter Meeting of the Association for Research in Otolaryngology, San Diego, CA, in February 2012. We thank Cassie Wilhelm for her assistance in data collection.
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