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Research in visual sign language acquisition has, since its advent in the 1960s, expanded the understanding of human language. Human languages are not fixed to the auditory modality but can develop in the visual modality as well. Stokoe was one of the first to observe the unique linguistic structures in visual sign language. He demonstrated that visual sign language has its own morphology and syntax as well as phonology. He described the phonology of visual sign language and revealed that every sign in sign language is made from three features that are called “primes”, those are hand shape, location and movement.
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