According to Folvern and Bonvillian (1991), children who are deaf and are taught sign language from birth develop the ability to communicate using single signed words before typically developing children speak their first word.

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Folvern and Bonvillian (1991) found that children who are deaf and are taught sign language from birth have been observed to communicate using single signed words before typically developing children speak their first word.

According to Folvern and Bonvillian (1991), Children Who Are Deaf