The acquisition of a sign language as a first language is a subject that is also of interest to researchers from many fields of study. This acquisition is significant for both deaf children of deaf parents as well as those of hearing parents, who consequently have late access to a language like Brazilian Sign language (Libras). The present study describes a test conducted with a pair of deaf twins who have hearing parents and who had their first contact with Libras at 5 years of age. However, upon being tested less than three years later, the twins showed a performance in Libras that was comparable to a deaf child of deaf parents. Although inconclusive, this study seeks to show the value of a continuous interlocutor, together with a genuine communicative interaction beginning from childhood, as commonly occurs with deaf twins, in the acquisition of a sign language.
first language acquisition; late language acquisition; sign language; deaf twins; Libras
