Journal of Phonetics最新文献

Diphthong vowels exhibit a degree of inherent dynamic change, the extent of which can vary synchronically and diachronically, such that diphthong vowels can become monophthongs and vice versa. Modelling this type of change requires defining diphthongs in opposition to monophthongs. However, formulating an explicit definition has proven elusive in acoustics and articulation, as diphthongisation is often gradient in these domains. In this study, we consider whether diphthong vowels form a coherent phonetic category from the articulatory point of view. We present articulometry and acoustic data from six speakers of Northern Anglo-English producing a full set of phonologically long vowels. We analyse several measures of diphthongisation, all of which suggest that diphthongs are not categorically distinct from long monophthongs. We account for this observation with an Articulatory Phonology/Task Dynamic model in which diphthongs and long monophthongs have a common gestural representation, comprising two articulatory targets in each case, but they differ according to gestural constriction and location of the component gestures. We argue that a two-target representation for all long vowels is independently supported by phonological weight, as well as by the nature of historical diphthongisation and present-day dynamic vowel variation in British English.

Abstract

The present study investigates the extent to which code-switching experience modulates short-term cross-linguistic phonetic interference. Three experiments were conducted, each examining a different acoustic parameter in the context of code-switching, a dual language paradigm previously shown to enhance cross-linguistic phonetic interference. Bilinguals’ prior experience with code-switching was assessed using the Bilingual Code-Switching Profile. In Experiment 1, Korean–English bilinguals’ productions of F1 and F2 for the code-switched English vowel /æ/ were compared to monolingual (i.e., non-switched) Korean /e/ and English /æ/. While code-switched English vowels shifted in the direction of monolingual Korean vowels, the results suggest that bilinguals with more code-switching experience exhibited reduced cross-linguistic interference relative to those with less experience. In Experiments 2 and 3, Spanish–English bilinguals’ productions of fricative voicing (Experiment 2) and spirantization of intervocalic voiced stops (Experiment 3) in Spanish and English code-switched tokens were compared to monolingual tokens. Results suggest that participants with greater code-switching experience produced less evidence of cross-linguistic phonetic interference for both fricative voicing and intervocalic spirantization. Collectively, and suggesting a role for executive control mechanisms at the phonetic level, these findings illustrate that code-switching experience serves to mitigate short-term cross-linguistic interference.

Unfamiliar accents can cause word recognition challenges, particularly in noisy environments, but few studies have incorporated quantitative pronunciation distance metrics to explain intelligibility differences across accents. To address this gap, intelligibility was measured for 18 talkers -- two from each of three first-language, one bilingual, and five second-language accents -- in quiet and two noise conditions. The relations between two edit distance metrics, which quantify phonetic differences from a reference accent, and intelligibility scores were assessed. Intelligibility was quantified through both fuzzy string matching and percent words correct. Both edit distance metrics were significantly related to intelligibility scores; a heuristic edit distance metric was the best predictor of intelligibility for both scoring methods. Further, there were stronger effects of edit distance as the listening condition increased in difficulty. Talker accent also contributed substantially to intelligibility models, but relations between accent and edit distance did not consistently pattern for the two talkers representing each accent. Frequency of production differences in vowels and consonants was negatively correlated with intelligibility, particularly for consonants. Together, these results suggest that significant amounts of variability in intelligibility across accents can be predicted by phonetic differences from the listener’s home accent. However, talker- and accent-specific pronunciation features, including suprasegmental characteristics, must be quantified to fully explain intelligibility across talkers and listening conditions.

When language users accommodate a novel phonetic variant, they adjust their perceptual and articulatory spaces in listener- and speaker-specific ways. Motivated by the centrality of accommodation and the perception-production relation to theories of phonetics and sound change, this study tests the hypothesis that individuals who are adept at perceptually retuning for a novel variant will be more accurate imitators of that form. In perceptual eye-tracking and spontaneous imitation ultrasound-imaging tasks, 37 American English participants were exposed to a talker’s novel raised /æ/ before /ɡ/ (bag), and to their familiar unraised /æk/ (back) and /eɪk/ (bake). Consistent with the hypothesis, results showed that the more participants showed perceptual facilitation (i.e., used raised /æ(ɡ)/ to disambiguate back-bag trials), the more they imitated raised /æ(ɡ)/. Perceptual retuning, though, did not predict articulatory restructuring: imitators produced not context-dependent raising, but more general “imitative” raising. For theories of sound change, the findings provide circumscribed support for especially adept perceptual adapters to an innovation having the potential to be strong disseminators of that variant. For theories of accommodation, findings point toward the importance of studying imitation of a targeted variant in the broader context of how talkers and imitators situate that variant in relation to phonetically similar forms.

This study investigates the phonetic realization of contrastive focus in short utterances in Seoul Korean, a so-called 'edge-prominence' language, which is assumed to express focus-induced prominence primarily through phrasing. The study explores how the distribution of phrase-level tones and their realization is influenced by focus in different positions of target words with different coda segmental makeups (/pam, pap/). Phrase-initially, focus displays a typical phrase-initial f0 rise for the L and H tones, with the L tone anchored to the focused monosyllabic word and the H tone to the following syllable, accompanied by a tonal expansion. This expansion results from an elevated f0 peak for the H while the L remains unchanged, showing tonal hyperarticulation only in the H tone. Phrase-medially, a similar f0 rise occurs under focus, but without robust tonal expansion. Crucially, the f0 rise is not accompanied by clear temporal or tonal evidence for the creation of a new phrase, demonstrating focus realization without phrasing. Phrase-finally, focus also shows no phrasing evidence. It results in an f0 fall, possibly due to tonal crowding of the L and H tones with the upcoming low boundary tone. However, this fall is distinct from a similar fall under no focus, suggesting a phonetic trace of the focal rise. Both initially and medially, the tonal realization of the f0 rise is affected by the segmental makeup (/pap/ vs. /pam/) only at the microprosodic level while maintaining the tonal targets, even in the face of physically adverse conditions for an f0 rise through the voiceless gap. The findings of the present study illuminate the intricate phonetic details of focus realization with a f0 rise in a language other than the well-studied West Germanic and Romance languages which employ word-level stress. The findings also shed new light on the relationship between focus and prosodic phrasing, implying that focus, previously argued to drive prosodic phrasing in Seoul Korean, is just one of several potentially competing structures that determine a sentence’s phrasing, thereby underscoring the multidimensional nature of prosodic structure.

Paradigms with conflicting data patterns can be difficult to learn, resulting in a type of language change called reanalysis. Existing models of morphophonology predict reanalysis to occur in a way that matches frequency distributions within the paradigm. Using evidence from Samoan, this paper argues that in addition, reanalysis may be constrained by phonotactics (global distributional regularities in the lexicon) and phonetic substance. More concretely, I find that reanalysis of Samoan thematic consonants generally matches distributional patterns within the paradigm. However, reanalysis is also modulated by a phonotactic dispreference against sequences of homorganic consonants, analyzed here in Optimality Theoretic terms by OCP-place. These results are supported by an iterated learning model that is based in MaxEnt (Goldwater and Johnson, 2003). In a study where phonetic similarity is measured as the spectral distance between two phones, I find that similarity of consonants is closely correlated with the strength of OCP-place effects in Samoan; this suggests that OCP-place is rooted in phonetic similarity avoidance, and more generally that in reanalysis, speakers preferentially utilize phonetically-motivated phonotactics.

This paper provides evidence for the assumption that the precise phonetic implementation of laryngeal contrast in obstruents can have an influence on higher order linguistic structure. Traditional varieties of Jutland Danish – which are all broadly ‘aspirating’ varieties – are used as a case study. The paper shows that the precise implementation of the aspirated–unaspirated contrast in stops varied systematically in these varieties, and that this covaries with the morphophonological process of stop gradation. Stop gradation is a lenition process which is historically found in the entire Danish-speaking area, but with quite varying outcomes, which were mapped extensively by dialectologists more than a century ago. Using a large legacy corpus of sociolinguistic interviews from the 1970s, this study shows that more sonorous outcomes of stop gradation covary with higher rates of continuous closure voicing in /b d g/ and shorter aspiration in /p t k/, and vice versa for less sonorous outcomes of stop gradation.

In this study, we explore individual variation and contrast in Swedish children’s voiceless fricatives. Thirty-one children between three and eight years of age participated in a picture-prompted word repetition task, wherein they repeated fricative-initial words in a variety of vowel contexts. The fricatives were transcribed and acoustically analysed, using spectral moments 1–4, spectral peak and spectral balance measures. Random forests were used to estimate the relative importance of each spectral feature in the classification of correct fricative productions, as well as to measure robustness of the late-emerging contrast between sibilants [s] and [ɕ] in individual children. Transcription analysis revealed that substitutions involving a more anterior place of articulation were common. Acoustic analysis showed individual differences in variability and contrast in the children’s fricative systems across and within age groups. Cue weighting of spectral characteristics in classification was similar in all age groups for correct productions, while the magnitude of the acoustic contrast between sibilants increased with age. This paper provides a description of individual variation in Swedish children’s acquisition of fricatives which can inform future large-scale speech-acquisition research.