Future research must be to develop models of language that explain the clustering of characteristics found in sign languages.
The discovery of these sign language properties brings to light observations about spoken language that seem to be determined by the modality alone, such as the tendency to string linguistic information out linearly, and the generally arbitrary nature of the lexicon and grammar. Before research on sign language, such characteristics were thought to be properties of language universally.
In the light of sign language research, we may suggest that these properties are artefacts of the oral–aural modality. Our work is cut out for us. An important goal of future research must be to develop models of language that explain the clustering of characteristics found in sign languages, as well as the fact that they conform to more general linguistic universals. In developing such models, we are charged with an equally important task: explaining precisely what it is about the spoken language modality that makes it different from sign language. Only by examining these two natural language systems together can we reach a complete understanding of the human genius for language.
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