The phonetics of code

This study investigates the effects of code-switching on vowel quality, pitch and duration among English–French bilinguals. Code-switching has been claimed to influence the morphology, syntax and lexicon, but not the phonology of the switched language. However, studies on voice-onset time have found subtle phonetic effects of code-switching, even though there are no categorical phonological effects. We investigate this further through the following three questions: (1) Are F1 and F2 influenced in the process of code-switching? (2) Are code-switched words hyper-articulated? (3) Does code-switching have an effect on vowel duration before voiced and voiceless consonants? To address our research questions we relied on an insertional switching method where words from one language were inserted into carrier phrases of the other to simulate English–French code-switching environments. Bilingual speakers were recorded while they read code-switched sentences as well as sentences that did not involve code-switching, that is, monolingual sentences. The vowels of target words in the recorded utterances were compared – code-switched contexts against monolingual contexts – for vocalic duration, F0, F1 and F2. Like previous voice-onset time studies, our results indicate that code-switching does not shift the phonology to that of the embedded language. We did, however, find subtle lower level phonetic effects, especially in the French target words; we also found evidence of hyper-articulation in code-switched words. At the prosodic level, target switch-words approached the prosodic contours of the carrier phrases they are embedded in. The approach taken in this study is novel for its investigation of vowel properties instead of voice-onset time. This new approach to investigating code-switching adds to our understanding of how code-switching affects pronunciation