Production and perception across three Hong Kong Cantonese consonant mergers: Community- and individual-level perspectives

Individual variation is key to understanding phenomena in phonetic variation and change, including the production-perception link. To test the generalizability of this relationship, this study compares community- and individual-level variation across three long-standing consonant mergers in Hong Kong Cantonese speakers: [n]→[l], [ŋ̩]→[m̩] and [ŋ-]↔Ø. Concurrently, we document these understudied mergers in a community that has undergone rapid social change in recent decades. Younger (college-aged) and older (middle-aged) Hong Kongers completed a reading/translation production task followed by a forced choice lexical identification perception task. Group-level results suggest mismatching production and perception: while the community overall distinguished merger pairs in production, younger listeners are more perceptually categorical than older listeners. However, aggregate results obscure the fact that individuals vary substantially in the extent of merging in both perception and production, including many who exhibit complete merger, and that individual-level production-perception correlations were found for [n]→[l] and [ŋ̩]→[m̩], though not [ŋ-]↔Ø. Results are discussed in the context of previous research. We find that (i) these mergers have diverged from predicted trajectories of completion, and (ii) overall, prior findings on the production-perception link are generalizable to these consonant mergers.