Sign languages are problematic for a gestural origins theory of language evolution

Behavioral and Brain Sciences 28 (2):130-131 (2005)
Abstract Sign languages exhibit all the complexities and evolutionary advantages of spoken languages. Consequently, sign languages are problematic for a theory of language evolution that assumes a gestural origin. There are no compelling arguments why the expanding spiral between protosign and protospeech proposed by Arbib would not have resulted in the evolutionary dominance of sign over speech.
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