The Journal of the Acoustical Society of America, Vol. 126, No. 5, pp. EL134–EL139, November 2009
©2009 Acoustical Society of America. All rights reserved. 
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Development of perceptual sensitivity to extrinsic vowel duration in infants learning American English
Eon-Suk Ko
University at Buffalo, State University of New York, Buffalo, New York 14260
Melanie Soderstrom
University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
James Morgan
Brown University, Providence, Rhode Island 02912
(Received: 14 July 2009; accepted: 31 August 2009; published online: 29 September 2009)8- and 14-month-old infants' perceptual sensitivity to vowel duration conditioned by post-vocalic consonantal voicing was examined. Half the infants heard CVC stimuli with short vowels, and half heard stimuli with long vowels. In both groups, stimuli with voiced and voiceless final consonants were compared. Older infants showed significant sensitivity to mismatching vowel duration and consonant voicing in the short condition but not the long condition; younger infants were not sensitive to such mismatching in either condition. The results suggest that infants' sensitivity to extrinsic vowel duration begins to develop between 8 and 14 months. ©2009 Acoustical Society of America
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