History of sign language
One of the earliest written records of a signed language occurred in the fifth century BC, in Plato’s Cratylus, where Socrates says: “If we hadn’t a voice or a tongue, and wanted to express things to one another, wouldn’t we try to make signs by moving our hands, head, and the rest of our body, just as dumb people do at present?”[3] It seems that groups of deaf people have used signed languages throughout history.
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