Promote the study of sign language.
The study of sign language provides a natural laboratory for isolating certain fundamental properties of human language apart from the modality in which it is transmitted. Doing so has confirmed the existence of purported language universals, such as a systematic sub-word level of structure, syntactic embedding and recursion, and particular types of complex word formation. It has also strengthened the claim that the acquisition of language by children is a natural and automatic process with a set timetable, pointing to some degree of genetic predisposition for the development of just such a system. Certain modality specific characteristics have also been found: a tendency for simultaneous layering of linguistic structure and particular types of grammatical constructions that are at once linguistic in the formal sense, and in some way iconic.
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