Uses data from both sides of the U.S.-Canada border to test a model regarding the way language changes diffuse over space. Two cases are examined: the non-diffusion of phonetic features from Detroit to Windsor and the gradual infiltration into Canadian English of American foreign (a) pronunciations. (Author/VWL)

Notes that English coronal stop deletion is constrained by the preceding segment, so that stops and sibilants favor deletion more than liquids and nonsibilant fricatives. Suggests the existence of an attractive theoretical integration of categorical and variable processes in the grammar to account for the constraint. (26 references) (Author/CK)