a1 University of California, San Diego
Children typically acquire their native language naturally and spontaneously at a very young age. The emergence of early grammar can be predicted from children's vocabulary size and composition (Bates et al., 1994; Bates, Bretherton & Snyder, 1998; Bates & Goodman, 1997). One central question in language research is understanding what causes the changes in early language acquisition. Some researchers argue that the qualitative and quantitative shifts in word learning simply reflect the changing character of the child's cognitive maturity (for example, Gentner, 1982), while others argue that the trajectory of early language acquisition is driven by the child's growing familiarity with the language (Gillette, Gleitman, Gleitman & Lederer, 1999; Snedeker & Gleitman, 2004). These hypotheses are difficult to adjudicate because language acquisition in virtually all hearing children begins from birth and occurs simultaneously with cognitive development and brain maturation. The acquisition of sign languages, in contrast, is frequently delayed until older ages. In the USA, over 90% of deaf children are born to hearing parents who do not use sign language (Schein, 1989). As a result, deaf children are often exposed to sign language as a first language at a range of ages well beyond infancy (Mayberry, 2007). In rare cases, some deaf individuals are isolated from all linguistic input until adolescence when they start receiving special services and begin to learn sign language through immersion (Morford, 2003). Case studies of language acquisition in such extreme late first-language (L1) learners provide a unique opportunity to investigate first-language learning. The current study investigates three cases of young teens who are in the early stages of acquiring American Sign Language (ASL) as a first language, to determine what first-language acquisition in adolescence looks like.
(Received May 03 2011)
(Revised August 14 2011)
(Accepted December 04 2011)
(Online publication January 20 2012)
[*] We thank the cases for their willing participation, Cindi Cassady, Michele Cannon, Marla Hatrak and other experienced professionals for their helpful discussions and insights about this work. This study was supported by an NIH Training Grant awarded to the Center for Research in Language at the University of California, San Diego (DC000041) and by a UCSD Chancellor's Interdisciplinary Collaboratories Fellowship. Portions of the data were presented at the Max Planck Institute for Psycholinguistics Workshop: Evolution in our Hand, the Boston University Conference on Language Development (BUCLD 35), the Theoretical Issues in Sign Language Issues Conference (TISLR 10), and the International Congress for the Study of Child Language (IASCL 12).