Historical Change in Signed Languages
Signed languages are natural human languages used by deaf people around the world as their primary language. This chapter explores the linguistic study of signed language, their linguistic properties, and aspects of their genetic and historical relationships. The chapter focuses on historical change that has occurred in signed languages, showing that the same linguistic processes that contribute to historical change in spoken languages, such as lexicalization, grammaticization, and semantic change, contribute to historical change in signed languages. Historical influences unique to signed languages, such as the educational approach of borrowing and adapting signs and an effort to create a system of representing the surrounding spoken/written language and of the incorporation of lexicalized fingerspelling are also discussed.