Lenition alternation in West Gyalrongic and its implications for Southeast Asian panchronic phonology

Based on internal reconstruction, this paper resolves a long-standing problem observed in Khroskyabs, a West Gyalrongic language (Sino-Tibetan), that seems to sporadically have lenited voiceless stops, resulting in irregular correspondences with East Gyalrongic. Two major sound changes are involved: intervocalic lenition and post-stress intersyllabic compression. It turns out that the processes proposed here are one probable solution to monosyllabicization in languages of Southeast Asia, explaining a pathway from polysyllables or sesquisyllables toward monosyllables. Through examining potential problems of previous reconstructions in various languages, this paper shows that the Khroskyabs case provides a plausible direction in the solution of relevant unresolved problems from a panchronic perspective.