Word Frequency and The Actuation of Sound Change

By presenting evidence from three different sound changes within the history of English, this paper demonstrates that sound changes do not always affect the most frequent words first; on the contrary, certain changes affect the least frequent words first. A comparison of sound changes exhibiting each direction of diffusion reveals that changes affecting the most frequent words first are motivated by physiological factors, acting on surface phonetic forms; changes affecting the least frequent words first are motivated by other, non-physiological factors, acting on underlying forms. Thus a direct correlation is drawn between the direction of diffusion and the actuation of sound change.