Abstract
Hanson and Shattuck‐Hufnagel (Proceedings of Acoustics ‘08) analyzed coda stop consonants for three children from the Imbrie corpus (A. Imbrie, Ph.D. thesis, MIT, 2005). Following the closure, voice bars were frequently observed in [+voice] stops, while [−voice] codas often had a period of noise overlapping the preceding vowel and extending into the closure. Possible explanations for this noise include motoric immaturity, imitation of something in their caregivers’ productions, or the child’s decision to provide additional cues to the voicing contrast (enhancement). In this study, the second possibility was investigated in recordings of each child’s primary caregiver. Coda stop consonants were analyzed in the words “bug,” “tub,” “cup,” and “duck,” specifically the durations of voice bars and vowel‐final noise. As expected, voice bars mainly occur in voiced codas; in contrast, vowel‐final noise occurs mainly with voiceless codas, and its duration and degree of overlap with the vowel/closure vary across subjects. Similar measures for the children will be compared with those of their primary caregivers. [Work supported by NIH Grants Nos. DC00075 and DC 008780, and a NSF CPATH grant.]
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