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Published online by Cambridge University Press: 28 November 2008
In American Sign Language (ASL), in addition to manual signs, specific nonmanual behaviors play a crucial role in the grammar of the language. For example, conditionals and relative clauses are signaled by obligatory nonmanual markers. This study focuses on the acquisition of negation in ASL, which is signaled by manual signs as well as an obligatory headshake. In particular, we address the developmental relationship between the communicative and grammatical (or linguistic) headshakes for negation. Study 1 includes naturalistic data from a cross-sectional sample of 51 deaf children, ranging in age from 1: 0 to 4: 11, who are acquiring ASL as their primary language. Study 2 includes longitudinal data from 16 of these children.