Study finds, Deaf Children of Hearing Parents Have Age-Level
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A Study was conducted to examine whether children who are deaf or hard of hearing who have hearing parents can develop age-level vocabulary skills when they have early exposure to a sign language.

This cross-sectional study of vocabulary size included 78 children who are deaf or hard of hearing between 8 and 68 months of age who were learning American Sign Language (ASL) and had hearing parents. Children who were exposed to ASL before 6 months of age or between 6 and 36 months of age were compared with a reference sample of 104 deaf and hard of hearing children who have parents who are deaf and sign.

Results:
--Deaf and hard of hearing children with hearing parents who were exposed to ASL in the first 6 months of life had age-expected receptive and expressive vocabulary growth.
--Children who had a short delay in ASL exposure had relatively smaller expressive but not receptive vocabulary sizes, and made rapid gains.

Finally, though hearing parents typically learn ASL alongside their deaf children, children exposed to ASL during infancy may acquire age-appropriate vocabulary skills. Deaf children with hearing parents may grow age-level vocabularies at rates that are comparable to native signers; early vocabulary abilities are strong predictors of success across domains.

Source: https://www.sciencedirect.com/science/article/pii/S0022347621000366
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