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PDF File Chapter 21 Diachronic Phonology. As the title of this part of the volume indicates, the study of sound change 1 compels us to think hard about the relationship between phonological structure and what lies beyond: the physics of sound, the physiology of speech, the social and cultural context of communication. et, for that very reason, diachrony lies at the heart of current phonological debates. In particular, historical questions are crucial to the renewed controversy between formalist and functionalist approaches to phonology, which respond in different ways to a fundamental fact: phonological structure is moulded by ..