The Lemma Dilemma: Finding relevant lemmas to include in the Communicative Development Inventory for Sign Language of the Netherlands (NGT-CDI)
MetadataShow full item record
Vocabulary size is a critical marker for language development. It serves as a predictor for future language development in spoken and/or sign languages. Given the relative lack of assessment instruments for sign language development in deaf children living in The Neherlands, we propose a lemma list for a future Communicative Development Inventory (CDI; Fenson et al., 1994) for Sign Language of the Netherlands (NGT): the NGT-CDI. When compiling this list of NGT lemmas, we compared the lemma lists of six sign languages (i.e., ASL-CDI, Anderson & Reilly, 2002; SLN-CDI, Hoiting, 2009; BSL-CDI, Woolfe et al., 2010; LSE-CDI, Rodriguez-Ortiz et al., 2019; ISL-CDI, Novogrodzky & Meir, 2020; DGS-CDI, Hennies et al., unpublished manuscript) and two spoken languages (MB-CDI, Fenson et al., 1994; N-CDI, Zink & Lejaegere, 2002). After a selection procedure, a proto list was compiled. A pilot study was conducted to test whether the proto list was suitable for our intended target groups: young deaf children of deaf parents (DCDP) and deaf children of hearing parents (DCHP) between 8-36 months old. It is expected that DCHP, who are born in a hearing environment, will receive atypical sign language input because NGT is not the native language of their parents. In the pilot study, two DCDP and one DCHP were involved. In general, we can conclude that the results show that the NGT lemma list is suitable for both target groups. This outcome is promising for the development of a future NGT-CDI that can be widely used.