Early explanations of sound change were often sought in extralinguistic factors such as climate or the speakers' physiology. More recently, scholars have been reluctant to explain changes this way, but the most widely accepted extralinguistic explanation is the substratum theory. Other linguists, notably the Prague group, looked to the linguistic…

A study of the pronunciation of an adult male Swahili speaker, a native and long-term resident of Mombasa Old Town, supplemented with notes on other adult speakers, suggests a new account of glides and phonological change in this variation of the language. The asymmetrical distribution of the two glide types (palatal and labiovelar) is analyzed…