Diachronic phonological typology: understanding inventory structure through sound change dynamics

We advocate for a diachronic typological approach to phonology, arguing that explanation for phonological structure must appeal to dynamic processes. We outline basic assumptions and explanatory mechanisms of this framework and demonstrate its utility by applying it to aspects of consonant phoneme inventory structure. Examining sound change paths through which palatal(ized) and ejective consonants emerge, we show that initial conditions in a language influence the likelihood of a sound change occurring, and that sound change trajectories may differ in their lifespans and the ease with which they are entered into. Regarding more general theoretical issues, we find that focusing on the dynamic processes that create inventories is more likely to produce accurate predictions about the patterns observed than structural generalizations such as feature economy. We conclude that further elucidating the details of sound change will lead to a fuller and more explanatory phonological typology.