James M. Scobbie

The role of syllable structure in external sandhi: An EPG study of vocalisation and retraction in word-final English /l/

A pre-vocalic connected speech context is said to enable the resyllabification of word-final consonants into an onset, thus conditioning alternations. We present EPG data on English word-final /l/, measuring the extent of alveolar contact and the rate of vocalisation, the extent of dorsal retraction (representing “darkness”), and the timing of alveolar contact relative to dorsal retraction. Two dialects of British English are considered, namely Scottish Standard English and Southern Standard British English. Results are that /l/ alternation is systematic: the tongue tip contact of word-final /l/, quite categorically for some speakers, is more onset-like in pre-vocalic and more coda-like in pre-consonantal contexts. This alternation is not along the lines predicted by a segmental resyllabification account, however. First, the segmental identity of the following consonant (/b/ or /h/) may be as powerful a factor in conditioning the presence or absence of alveolar contact for some speakers. Second, glottalisation of lexically vowel-initial words regularly occurs, but does not seem to condition the appearance (or otherwise) of tongue tip contact. Third, the tongue dorsum remains retracted and does not adopt an onset-like form or timing even when /l/ is pre-vocalic. Thus categorical resyllabification of a word-final /l/ segment based on phonotactic acceptability is rejected as a mechanism controlling English L-sandhi in connected speech. Instead, we propose a gestural-episodic model, in which individual gestures display different levels of coherence in lexical syllable roles, while in connected speech, segmental sequences are influenced by similarity to well-rehearsed lexical sequences, if they exist.

Using ultrasound visual biofeedback to treat persistent primary speech sound disorders

Abstract Growing evidence suggests that speech intervention using visual biofeedback may benefit people for whom visual skills are stronger than auditory skills (for example, the hearing-impaired population), especially when the target articulation is hard to describe or see. Diagnostic ultrasound can be used to image the tongue and has recently become more compact and affordable leading to renewed interest in it as a practical, non-invasive visual biofeedback tool. In this study, we evaluate its effectiveness in treating children with persistent speech sound disorders that have been unresponsive to traditional therapy approaches. A case series of seven different children (aged 6–11) with persistent speech sound disorders were evaluated. For each child, high-speed ultrasound (121 fps), audio and lip video recordings were made while probing each child’s specific errors at five different time points (before, during and after intervention). After intervention, all the children made significant progress on targeted segments, evidenced by both perceptual measures and changes in tongue-shape.

Measuring language-specific phonetic settings

While it is well known that languages have different phonemes and phonologies, there is growing interest in the idea that languages may also differ in their ‘phonetic setting’. The term ‘phonetic setting’ refers to a tendency to make the vocal apparatus employ a language-specific habitual configuration. For example, languages may differ in their degree of lip-rounding, tension of the lips and tongue, jaw position, phonation types, pitch range and register. Such phonetic specifications may be particularly difficult for second language (L2) learners to acquire, yet be easily perceivable by first language (L1) listeners as inappropriate. Techniques that are able to capture whether and how an L2 learner’s pronunciation proficiency in their two languages relates to the respective phonetic settings in each language should prove useful for second language research. This article gives an overview of a selection of techniques that can be used to investigate phonetic settings at the articulatory level, such as flesh-point tracking, ultrasound tongue imaging and electropalatography (EPG), as well as a selection of acoustic measures such as measures of pitch range, long-term average spectra and formants.

Bunched /r/ promotes vowel merger to schwar: an ultrasound tongue imaging study of Scottish sociophonetic variation

For a century, phoneticians have noted a vowel merger in middle-class Scottish English, in the neutralisation of prerhotic checked vowels /ɪ/, /ʌ/, /ɛ/ to a central vowel, e.g. fir, fur, fern [fəɹ], [fəɹ] [fəɹn], or [fɚ], [fɚ], [fɚn]. Working-class speakers often neutralise two of these checked vowels to a low back [ʌ] vowel, fir, fur, both pronounced as [fʌɹ] or as [fʌʕ]. The middle-class merger is often assumed to be an adaptation towards the UK’s socially prestigious R.P. phonological system in which there is a long-standing three-way non-rhotic merger, to [ɜː]. However, we suggest a system-internal cause, that coarticulation with the postvocalic /r/ may play a role in the contemporary Scottish vowel merger. Indeed, strongly rhotic middle-class Scottish speakers have recently been found to produce postvocalic approximant /r/ using a markedly different tongue configuration from working-class Scottish speakers, who also tend to derhoticise /r/. We present the results of an ultrasound tongue imaging investigation into the differing coarticulatory effects of bunched and tongue-front raised /r/ variants on preceding vowels. We compare tongue shapes from two static points during rhotic syllable rimes. Phonetically, it appears that the bunched /r/ used by middle-class speakers exerts a stronger global coarticulatory force over preceding vowel tongue configurations than tongue-front raised /r/ does. This also results in a monophthongal rhotic target for what historically had been three distinct checked vowels. Phonologically, our view is that middle-class speakers of Scottish English have reduced the V+/r/ sequence to one segment; either a rhoticised vowel /ɚ/ or a syllabic rhotic /r/.

Advances in EPG for treatment and research: an illustrative case study.

Electropalatography (EPG), a technique which reveals tongue‐palate contact patterns over time, is a highly effective tool for speech research. We report here on recent developments by Articulate Instruments Ltd. These include hardware for Windows‐based computers, backwardly compatible (with Reading EPG3) software systems for clinical intervention and laboratory‐based analysis for EPG and acoustic data, and an enhanced clinical interface with client and file management tools. We focus here on a single case study of a child aged 10± years who had been diagnosed with an intractable speech disorder possibly resulting ultimately from a complete cleft of hard and soft palate. We illustrate how assessment, diagnosis and treatment of the intractable speech disorder are undertaken using this new generation of instrumental phonetic support. We also look forward to future developments in articulatory phonetics that will link EPG with ultrasound for research and clinical communities.

Singing a different tune in your native language: first language attrition of prosody.

First language attrition refers to the changes which a first language (L1) undergoes when a second language (L2) is acquired in a context in which L1 use is reduced (Cook, 2003; Köpke, 2004). To date, some studies have focused on complete loss of an L1, for example in the case of children whose contact with their initial language ceased after adoption (Pallier et al., 2003; Ventureyra, Pallier, & Yoo, 2004). Others have investigated more subtle cases in which changes to the L1 occur, although intelligibility remains largely, or completely, unaffected (de Leeuw, Schmid, & Mennen, 2007; Flege, 1987; Flege & Eefting, 1987; Major, 1992; Mennen, 2004). The study at hand belongs to the latter category, comprising a fine phonetic analysis of prosody in 10 late consecutive German–English bilinguals. In general, the results indicate L1 attrition in the intonational alignment of the prenuclear rise. However, interpersonal variation was also evidenced: two bilinguals performed clearly within the English monolingual norm in their German while one bilingual evidenced no L1 attrition. Intrapersonal variation occurred in the form of the start of the prenuclear rise appearing to undergo more L1 attrition than the end. The results are discussed in relation to previous studies suggesting that L1 attrition is less likely to occur in late consecutive bilinguals than in early consecutive bilinguals and, more generally, with regard to transfer and interference.

R) as a Variable

All sounds are variable, but some are more variable than others. Does hyper-variation mean a greater disposition for sociolinguistically relevant conditioning, or, alternatively, a tendency for relatively greater noisiness in the distribution of unconditioned variants? Whatever the case, there should clearly be a special interest in the sociolinguistic systemization of those sounds that are so unusually prone to variation that it is difficult to capture them within a simple articulatory and acoustic definition. Such is the case with the sociolinguistic variable (R).

Dynamic systems, maturational constraints and L1 phonetic attrition

The present study comprises a phonetic analysis of the lateral phoneme /l/ in the first (L1) and second language (L2) of 10 late German–English bilinguals. The primary objective of the study was to compare the predictive power of dynamic systems theory with that of maturational constraints through a phonetic investigation of L1 attrition in the lateral phoneme /l/ of the late bilinguals. The results revealed L1 attrition in the lateral phoneme /l/, as well as a high degree of interpersonal and intrapersonal variation. These patterns are discussed in relation to dynamic systems theory and maturational constraints. Moreover, the degree of permanency of L1 attrition is discussed in relation to methodological considerations in studies on L1 attrition. It is proposed that maturational constraints are insufficient in explaining the results and that bilingual language development can be more adequately explained through dynamic systems theory, which explicitly incorporates a multitude of predictor variables across the lifespan, in addition to age constraints.

A Socio-Articulatory Study of Scottish Rhoticity

Increasing attention is being paid in sociolinguistics to how fine phonetic variation is exploited by speakers to construct and index social identity (Hay and Drager 2007). To date, most sociophonetic work on consonants has made use of acoustic analysis to reveal unexpectedly subtle variation which is nonetheless socially indexical (e.g. Docherty and Foulkes 1999). However, some aspects of speech production are not readily recoverable even with a fine-grained acoustic analysis. New articulatory analysis techniques, such as ultrasound tongue imaging (UTI), allow researchers to push the boundaries further, identifying seemingly covert aspects of speech articulation which pattern with indexical factors with remarkable consistency. One such case is postvocalic /r/ variation in Central Scotland.

Tongue reading : comparing the interpretation of visual information from inside the mouth, from electropalatographic and ultrasound displays of speech sounds

Speakers possess a natural capacity for lip reading; analogous to this, there may be an intuitive ability to “tongue-read.” Although the ability of untrained participants to perceive aspects of the speech signal has been explored for some visual representations of the vocal tract (e.g. talking heads), it is not yet known to what extent there is a natural ability to interpret speech information presented through two clinical phonetic tools: EPG and ultrasound. This study aimed to determine whether there is any intuitive ability to interpret the images produced by these systems, and to determine whether one tool is more conducive to this than the other. Twenty adults viewed real-time and slow motion EPG and ultrasound silent movies of 10 different linguo-palatal consonants and 4 vowels. Participants selected which segment they perceived from four forced-choice options. Overall, participants scored above chance in the EPG and ultrasound conditions, suggesting that these images can be interpreted intuitively to some degree. This was the case for consonants in both the conditions and for vowels in the EPG condition.