Head Thrust is a significant nonmanual signal in American Sign Language (ASL). It occurs on the final sign in a conditional clause, in combination with a brow raise and a rotated head position. The signal is unlike other grammatical signals involving a brow raise. (Author/CB)

In sign languages of the Deaf, now recognized as fully legitimate human languages, some signs can meaningfully point toward things or can be meaningfully placed in the space ahead of the signer. Such spatial uses of sign are an obligatory part of fluent grammatical signing. There is no parallel for this in vocally produced languages. This book…

Focuses on the acquisition of negation in American Sign Language (ASL) and the developmental relationship between the communicative and grammatical (or linguistic) headshakes for negation in deaf children acquiring ASL. Results indicate that the systems for communication and language are differentially mediated. (35 references) (Author/CK)