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Vowel confusion patterns in adults during initial 4 years of implant use.

This study investigated adult cochlear implant users' ( n == 39) vowel recognition and confusions by an open-set syllable test during 4 years of implant use, in a prospective repeated-measures design. Subjects' responses were coded for phoneme errors and estimated by the generalized mixed model. Imp...

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Published in:Clinical Linguistics & Phonetics Vol. 25; no. 2; pp. 121 - 145
Main Authors: Väälimaa TT, Sorri MJ, Laitakari J, Sivonen V, Muhli A
Format: research tables/charts Journal Article
Published: Taylor & Francis Ltd Feb2011
Online Access:View this record in EBSCOhost
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      jtl: Clinical Linguistics & Phonetics
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      dt: Feb2011
      vid: 25
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      pub: Taylor & Francis Ltd
      place: Philadelphia, Pennsylvania
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        10.3109/02699206.2010.514692
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        atl: Vowel confusion patterns in adults during initial 4 years of implant use.
      aug:
        au:
          Väälimaa TT
          Sorri MJ
          Laitakari J
          Sivonen V
          Muhli A
        affil: Faculty of Humanities, Logopedics, University of Oulu, Finland
      sug:
        subj:
          Vowels
          Confusion
          Cochlear Implant Classification
          Speech Perception In Adulthood
          Time Factors
          Human
          Adult
          Prospective Studies
          Repeated Measures
          Equipment Design
          Learning
          Male
          Female
          Middle Age
          Finland
          Language Tests
          Coding
          Confidence Intervals
          Recognition (Psychology)
          Correlation Coefficient
          Speech Acoustics
          Adult: 19-44 years
          Middle Aged: 45-64 years
          Male
          Female
      ab: This study investigated adult cochlear implant users' ( n == 39) vowel recognition and confusions by an open-set syllable test during 4 years of implant use, in a prospective repeated-measures design. Subjects' responses were coded for phoneme errors and estimated by the generalized mixed model. Improvement in overall vowel recognition was highest during the first 6 months, showing statistically significant change until 4 years, especially for the mediocre performers. The best performers improved statistically significantly until 18 months. The poorest performers improved until 12 months and exhibited more vowel confusions. No differences were found in overall vowel recognition between Nucleus24M//24R and Med-ElC40++ device users (matched comparison), but certain vowels showed statistically significant differences. Vowel confusions between adjacent vowels were evident, probably due to the implant users' inability to discriminate formant frequencies. Vowel confusions were also dominated by vowels whose average F1 and//or F2 frequencies were higher than the target vowel, indicating a basalward shift in the confusions.
      pubtype: Academic Journal
      doctype:
        research
        tables/charts
        Journal Article
      ougenre: Article
    language: English
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