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In this article, we analyze the grammatical incorporation of demonstratives in a tactile language, emerging in communities of DeafBlind signers in the US who communicate via reciprocal, tactile channels—a practice known as “protactile.” In the first part of the paper, we report on a synchronic analysis of recent data, identifying four types of “taps,” which have taken on different functions in protacitle language and communication. In the second part of the paper, we report on a diachronic analysis of data collected over the past 8 years. This analysis reveals the emergence of a new kind of “propriotactic” tap, which has been co-opted by the emerging phonological system of protactile language. We link the emergence of this unit to both demonstrative taps, and backchanneling taps, both of which emerged earlier. We show how these forms are all undergirded by an attention-modulation function, more or less backgrounded, and operating across different semiotic systems. In doing so, we contribute not only to what is known about demonstratives in tactile languages, but also to what is known about the role of demonstratives in the emergence of new languages. 

A new phonological system is becoming conventional across a group of DeafBlind signers in the United States who communicate via reciprocal, tactile channels—a practice known as ‘Protactile’. The recent conventionalization of protactile phonology is analyzed in this article. Research on emergent visual signed languages has demonstrated that conventionalization is not a single monolithic process, but a complex of principles involving patterns of distribution—discreteness, stability, and productivity of form—as form becomes linked with meaning in increasingly stable ways. Conventionalization of protactile phonology involves assigning specific grammatical roles to the four hands (and arms) of signer 1 (‘conveyer’) and signer 2 (‘receiver’) in ‘proprioceptive constructions’ (PCs)—comparable to ‘classifier constructions’ in visual signed languages. Analyz- ing PCs offers new insights into how the conventionalization of a phonological system can play out in the tactile modality