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Accuracy of consonant-vowel syllables in young cochlear implant recipients and hearing children in the single word period

Barbara L. Davis
Peter F. MacNeilage
The University of Texas at Austin

Address correspondence to: Andrea D. Warner-Czyz, The University of Texas at Dallas, Callier Center for Communication Disorders, 1966 Inwood Road, Dallas, Texas 75235, E-mail: warnerczyz{at}utdallas.edu, Telephone: 214/905-3124, Fax: 214/905-3146

Purpose: Attaining speech accuracy requires that children perceive and attach meanings to vocal output based on production system capacities. Because auditory perception underlies speech accuracy, profiles for children with hearing loss (HL) differ from children with normal hearing (NH).

Method: To understand the impact of auditory history on emergence of speech capacities, CV syllable accuracy in early words was compared in 4 NH children and 4 children with HL who received cochlear implants (CI) before age 2 years. Participants were video-recorded monthly for 6 months following word onset. CV vocalizations were coded perceptually using broad phonetic transcription. Observed-to-expected ratios of CV productions and accuracy were tested with ². An ordered multinomial model tested level of accuracy, including both accuracy and error patterns.

Results: Most frequently produced sequences were most accurately produced across "group" and "time". NH children were more accurate overall than CI children. Both groups improved accuracy over time by decreasing partially accurate productions (accurate consonant-inaccurate vowel). Both groups favored CV patterns with compatible place of articulation between consonant and vowel in absolute frequency and level of accuracy.

Conclusions: Differences in emergence of CV syllable accuracy arise from differences in auditory perception between the NH and CI groups.

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