Document Detail

Longitudinal analysis of vowels in infant-directed speech.
MedLine Citation:
PMID:  20331145     Owner:  NLM     Status:  In-Data-Review    
Adult-directed conversational speech (ADS) is characterized by a high level of acoustic imprecision which should theoretically cause problems for infant language learning. Whether infant-directed speech (IDS) is clearer than ADS is disputed. However, differences in prosody [Fernald (1989)], utterance length [Cooper (1997)], and acoustic features [Bernstein Ratner (1984) and Malsheen (1980)] have been found. Such differences have the potential to assist children in decoding language input [Fernald (1985)]. In prior research, the child's age and language ability appear to affect speech clarification [Bernstein Ratner (1996)]. This study examines whether vowel clarification is a function of the infants' age. More than 75 mother-infant dyads are being followed from 7 months to 2 years of age. Data reported here are from 10 dyads whose data have been fully analyzed. Plots of the first and second formant values for vowels in words spoken in IDS and ADS were compared at 7 and 11 months of age. Vowels to 7-month-old infants appear to show less clarification than those to 11-month infants, although individual patterns of clarification are evident. This study analyzes whether such variability in vowel clarification affects the rate of early infant vocalizations prior to language production. [Work supported by NSF BCS074512.].
Kerry E McColgan; Nan Bernstein Ratner; Rochelle Newman
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of the Acoustical Society of America     Volume:  127     ISSN:  1520-8524     ISO Abbreviation:  J. Acoust. Soc. Am.     Publication Date:  2010 Mar 
Date Detail:
Created Date:  2010-03-24     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2017     Citation Subset:  IM    
Dept. of Hearing and Speech Sci., Univ. of Maryland, 0100 Lefrak Hall, College Park, MD 20742,
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