Document Detail

Effects of deafness on acoustic characteristics of American English tense/lax vowels in maternal speech to infants.
MedLine Citation:
PMID:  22894224     Owner:  NLM     Status:  MEDLINE    
Recent studies have demonstrated that mothers exaggerate phonetic properties of infant-directed (ID) speech. However, these studies focused on a single acoustic dimension (frequency), whereas speech sounds are composed of multiple acoustic cues. Moreover, little is known about how mothers adjust phonetic properties of speech to children with hearing loss. This study examined mothers' production of frequency and duration cues to the American English tense/lax vowel contrast in speech to profoundly deaf (N = 14) and normal-hearing (N = 14) infants, and to an adult experimenter. First and second formant frequencies and vowel duration of tense (/i/, /u/) and lax (/I/, /ʊ/) vowels were measured. Results demonstrated that for both infant groups mothers hyperarticulated the acoustic vowel space and increased vowel duration in ID speech relative to adult-directed speech. Mean F2 values were decreased for the /u/ vowel and increased for the /I/ vowel, and vowel duration was longer for the /i/, /u/, and /I/ vowels in ID speech. However, neither acoustic cue differed in speech to hearing-impaired or normal-hearing infants. These results suggest that both formant frequencies and vowel duration that differentiate American English tense/lx vowel contrasts are modified in ID speech regardless of the hearing status of the addressee.
Maria V Kondaurova; Tonya R Bergeson; Laura C Dilley
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural    
Journal Detail:
Title:  The Journal of the Acoustical Society of America     Volume:  132     ISSN:  1520-8524     ISO Abbreviation:  J. Acoust. Soc. Am.     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-08-16     Completed Date:  2013-01-16     Revised Date:  2013-08-12    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1039-49     Citation Subset:  IM    
Department of Otolaryngology-Head & Neck Surgery, Indiana University School of Medicine, 699 Riley Hospital Drive-RR044, Indianapolis, Indiana 46202, USA.
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MeSH Terms
Acoustic Stimulation
Audiometry, Pure-Tone
Auditory Threshold
Case-Control Studies
Deafness / diagnosis,  physiopathology,  psychology*
Mother-Child Relations*
Mothers / psychology*
Severity of Illness Index
Sound Spectrography
Speech Acoustics*
Speech Perception*
Speech Production Measurement
Time Factors
Voice Quality*
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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