Research on deaf children of deaf parents who have American Sign Language from birth is used to study:

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The research on deaf children of deaf parents who have American Sign Language from birth is often used to study the critical period hypothesis. This hypothesis suggests there is a specific time frame during which language acquisition must occur for it to develop fully. By comparing these children to deaf children of hearing parents, who might not be exposed to a fully accessible language from birth, researchers can investigate how early language exposure influences language development.

Research on Deaf Children of Deaf Parents Who Have American