Central Taurus Sign Language: On the Edge of Conventionalization

We discuss the conventionalization process in Central Taurus Sign Language (CTSL), an emerging sign language in its initial stages, and present evidence from four studies for the amount of lexical and structural variation it harbors. The four studies together portray the architecture of a young system under construction. Study 1 looks at signs for everyday objects and finds considerable variation in their degree of conventionalization. Study 2 examines modifier-head and negation-head relationships, showing substantial conventionalization. Study 3 addresses the emergence and conventionalization of various word orders as argument structure markers. It shows that conventionalization increases over successive cohorts of signers, but it decreases as argument structure becomes more complex. Study 4 demonstrates the emergence and conventionalization of distinctive morphological markers to signal the subtle semantics of symmetry and reciprocity. Finally, we raise the issue of whether CTSL presents evidence of syntactic structure, or whether its properties can be characterized in terms of a simpler “linear grammar” that maps directly between phonology and semantics.