Journal
DEVELOPMENTAL SCIENCE
Volume 9, Issue 2, Pages F13-F21Publisher
WILEY
DOI: 10.1111/j.1467-7687.2006.00468.x
Keywords
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Funding
- NICHD NIH HHS [HD 37954, P30 HD02274] Funding Source: Medline
- NIDCD NIH HHS [P30 DC04661] Funding Source: Medline
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Patterns of developmental change in phonetic perception are critical to theory development. Many previous studies document a decline in nonnative phonetic perception between 6 and 12 months of age. However, much less experimental attention has been paid to developmental change in native-language phonetic perception over the same time period. We hypothesized that language experience in the first year facilitates native-language phonetic performance between 6 and 12 months of age. We tested 6-8- and 10-12-month-old infants in the United States and Japan to examine native and nonnative patterns of developmental change using the American English Ir-11 contrast. The goals of the experiment were to: (a) determine whether facilitation characterizes native-language phonetic change between 6 and 12 months of age, (b) examine the decline previously observed for nonnative contrasts and (c) test directional asynimetriesjbr consonants. The results show a significant increase in performance for the native-language contrast in the first year, a decline in nonnative perception over the same time period, and indicate directional asymmetries that are constant across age and culture. We argue that neural commitment to native-language phonetic properties explains the pattern of developmental change in the first year.
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