Twenty-five chapters (including an instructive introduction) by fifty-two scholars offer information about over forty sign languages. Assessing how many sign languages there are in the world is difficult both because countries rarely include information about sign in censuses and because the determination of what counts as a language versus a less-developed gestural system is tricky. Still, the number of sign languages studied here is impressive, particularly since most here are genetically unrelated. This book is a treasure trove.
Many early studies of sign languages aimed to establish their status as bona fide natural languages and, thus, focused on properties in common with spoken languages. Once that basic issue was confirmed, attention turned to how modality differences affect grammar and the behavior of language communities, thus allowing us to advance our knowledge both of cognitive aspects of language and psychosocial factors pertinent to language use. The introduction to this volume beautifully lays out three advantages of considering sign languages in this regard. First, analysis [End Page 890] of a sign language can make clear what visual properties of the phonetic system motivate structural linguistic properties, opening the door for linguists to seek out what auditory properties of the phonetic system do the same in spoken languages. Second, iconicity in sign languages is readily accessible and
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