L1 Influences on Bulgarian-Accented German : Prosodic Units and Prenuclear Pitch Accents

This study investigates the L1 influence on the use of accentual patterns, choice of prenuclear pitch accent types and their realization on L2 prosody. We use Mennen’s LILt model as a framework for our analysis. We recorded ten Bulgarian female speakers of German and ten female native German speakers who read Aesop’s fable The North Wind and the Sun. We found that the tendency for the Bulgarian native speakers to use more pitch accents than German native speakers is transferred to the L2 German of the Bulgarian learners. L*+H was the most frequent prenuclear pitch accent used by all groups. We also found that the Bulgarian learners stressed more function words and tolerated more stress clashes than the native German speakers. When speaking German, under the influence of the statistical regularities that relate to prosodic word patterns in their mother tongue, Bulgarian learners phrased their L2 speech into a higher number of shorter prosodic words, and therefore realized more pitch accents and aligned the high tonal target earlier than the native speakers. Concerning the variable alignment of the high target, we propose the prosodic word or the two-syllable window as the tentative candidate for an anchorage region. Our findings can be explained with respect to age of learning, as proposed by LILt’s general theoretical assumptions

The Production and Perception of Subject Focus Prosody in L2 Spanish

New information can be introduced in discourse through different strategies, including syntactic and prosodic ones. This project provides an account of the syntactic and intonational strategies used for focus-marking in Peninsular Spanish, Mainstream American English and L2 Spanish using parallel experimental designs and a unitary method of analysis within the Autosegmental-Metrical framework for the study of intonation. It provides a comprehensive description of specific phonological categories and their phonetic implementation not only in monolingual speech, but also as they develop in the L2 grammar of Spanish learners with different experiences with the target language, following the premises of the L2 Intonation Learning Theory (LILt). Additionally, the perception of L2 intonation by native speakers was examined using an acceptability judgment task. Findings show that the intonational grammars of Spanish learners develop despite the lack of formal instruction, which allows them to produce native-like contours in certain contexts even if they have not been immersed in the target language for an extended period of time. This development is, nonetheless, constrained by different linguistic (i.e. transfer, universal patterns) and individual factors (i.e. onset of acquisition, proficiency). Furthermore, results from the acceptability judgment task suggest that learners’ communicative intentions are correctly identified by native speakers when they use target-like contours, but they are misinterpreted when they fail to produce a target-like contour. This study contributes to the understanding of the role of transfer, linguistic interdependencies and interlanguage representations in the development of intonational grammars. Moreover, it shows that the acquisition of intonation is not so different from the L2 acquisition of morpho-syntax or segmental phonology and may be examined through similar approaches, including feature-based ones

Individual Differences in Speech Production and Perception

Inter-individual variation in speech is a topic of increasing interest both in human sciences and speech technology. It can yield important insights into biological, cognitive, communicative, and social aspects of language. Written by specialists in psycholinguistics, phonetics, speech development, speech perception and speech technology, this volume presents experimental and modeling studies that provide the reader with a deep understanding of interspeaker variability and its role in speech processing, speech development, and interspeaker interactions. It discusses how theoretical models take into account individual behavior, explains why interspeaker variability enriches speech communication, and summarizes the limitations of the use of speaker information in forensics

Information density and phonetic structure: Explaining segmental variability

There is growing evidence that information-theoretic principles influence linguistic structures. Regarding speech several studies have found that phonetic structures lengthen in duration and strengthen in their spectral features when they are difficult to predict from their context, whereas easily predictable phonetic structures are shortened and reduced spectrally. Most of this evidence comes from studies on American English, only some studies have shown similar tendencies in Dutch, Finnish, or Russian. In this context, the Smooth Signal Redundancy hypothesis (Aylett and Turk 2004, Aylett and Turk 2006) emerged claiming that the effect of information-theoretic factors on the segmental structure is moderated through the prosodic structure. In this thesis, we investigate the impact and interaction of information density and prosodic structure on segmental variability in production analyses, mainly based on German read speech, and also listeners' perception of differences in phonetic detail caused by predictability effects. Information density (ID) is defined as contextual predictability or surprisal (S(unit_i) = -log2 P(unit_i|context)) and estimated from language models based on large text corpora. In addition to surprisal, we include word frequency, and prosodic factors, such as primary lexical stress, prosodic boundary, and articulation rate, as predictors of segmental variability in our statistical analysis. As acoustic-phonetic measures, we investigate segment duration and deletion, voice onset time (VOT), vowel dispersion, global spectral characteristics of vowels, dynamic formant measures and voice quality metrics. Vowel dispersion is analyzed in the context of German learners' speech and in a cross-linguistic study. As results, we replicate previous findings of reduced segment duration (and VOT), higher likelihood to delete, and less vowel dispersion for easily predictable segments. Easily predictable German vowels have less formant change in their vowel section length (VSL), F1 slope and velocity, are less curved in their F2, and show increased breathiness values in cepstral peak prominence (smoothed) than vowels that are difficult to predict from their context. Results for word frequency show similar tendencies: German segments in high-frequency words are shorter, more likely to delete, less dispersed, and show less magnitude in formant change, less F2 curvature, as well as less harmonic richness in open quotient smoothed than German segments in low-frequency words. These effects are found even though we control for the expected and much more effective effects of stress, boundary, and speech rate. In the cross-linguistic analysis of vowel dispersion, the effect of ID is robust across almost all of the six languages and the three intended speech rates. Surprisal does not affect vowel dispersion of non-native German speakers. Surprisal and prosodic factors interact in explaining segmental variability. Especially, stress and surprisal complement each other in their positive effect on segment duration, vowel dispersion and magnitude in formant change. Regarding perception we observe that listeners are sensitive to differences in phonetic detail stemming from high and low surprisal contexts for the same lexical target.Informationstheoretische Faktoren beeinflussen die Variabilität gesprochener Sprache. Phonetische Strukturen sind länger und zeigen erhöhte spektrale Distinktivität, wenn sie aufgrund ihres Kontextes leicht vorhersagbar sind als Strukturen, die schwer vorhersagbar sind. Die meisten Studien beruhen auf Daten aus dem amerikanischen Englisch. Nur wenige betonen die Notwendigkeit für mehr sprachliche Diversität. Als Resultat dieser Erkenntnisse haben Aylett und Turk (2004, 2006) die Smooth Signal Redundancy Hypothese aufgestellt, die besagt, dass der Effekt von Vorhersagbarkeit auf phonetische Strukturen nicht direkt, sondern nur die prosodische Struktur umgesetzt wird. In dieser Arbeit werden der Einfluss und die Interaktion von Informationsdichte und prosodischen Strukturen auf segmentelle Variabilität im Deutschen sowie die Wahrnehmungsfähigkeit von Unterschieden im phonetischen Detail aufgrund ihrer Vorhersagbarkeit untersucht. Informationsdichte (ID) wird definiert als kontextuelle Vorhersagbarkeit oder Surprisal (S(unit_i) = -log2 P(unit_i|context)). Zusätzlich zu Surprisal verwenden wir auch Wortfrequenz und prosodische Faktoren, wie primäre Wortbetonung, prosodische Grenze und Sprechgeschwindigkeit als Variablen in der statistischen Analyse. Akustisch-phonetische Maße sind Segmentlänge und -löschung, voice onset time (VOT), Vokaldispersion, globale und dynamische vokalische Eigenschaften und Stimmqualität. Vokaldispersion wird nicht nur im Deutschen, sondern auch in einer sprachübergreifenden Analyse und im Kontext von L2 untersucht. Wir können vorherige Ergebnisse, die auf dem Amerikanischen beruhten, für das Deutsche replizieren. Reduzierte Segmentlänge und VOT, höhere Wahrscheinlichkeit der Löschung und geringere Vokaldispersion werden auch für leicht vorhersagbare Segmente im Deutschen beobachtet. Diese zeigen auch weniger Formantenbewegung, reduzierte Kurvigkeit in F2 sowie erhöhte Behauchtheitswerte als Vokale, die schwer vorhersagbar sind. Die Ergebnisse für Wortfrequenz zeigen ähnliche Tendenzen: Deutsche Segmente in hochfrequenten Wörtern sind kürzer, werden eher gelöscht, zeigen reduzierte Werte für Vokaldispersion, Formantenbewegungen und Periodizität als deutsche Segmente in Wörtern mit geringer Frequenz. Obwohl wir bekannte Effekte für Betonung, Grenze und Tempo auf segmentelle Variabilität in den Modellen beobachten, sind die Effekte von ID signifikant. Die sprachübergreifende Analyse zeigt zudem, dass diese Effekte auch robust für die meisten der untersuchten Sprachen sind und sich in allen intendierten Sprechgeschwindigkeiten zeigen. Surprisal hat allerdings keinen Einfluss auf die Vokaldispersion von Sprachlernern. Des weiteren finden wir Interaktionseffekte zwischen Surprisal und den prosodischen Faktoren. Besonders für Wortbetonung lässt sich ein stabiler positiver Interaktionseffekt mit Surprisal feststellen. In der Perzeption sind Hörer durchaus in der Lage, Unterschiede zwischen manipulierten und nicht manipulierten Stimuli zu erkennen, wenn die Manipulation lediglich im phonetischen Detail des Zielwortes aufgrund von Vorhersagbarkeit besteht

Intonation & Prosodic Structure in Beaver (Athabaskan) - Explorations on the language of the Danezaa

This dissertation reports on qualitative and quantitative investigations on the intonation and the prosodic structure of Beaver, an endangered Athabaskan language of Northwest Canada. The focus of the study is on the Northern Alberta dialect of Beaver, which has lexical tone and is a high marking Athabaskan language. The theoretical framework of the analysis is the Autosegmental Metrical (AM) theory. Following some background on intonation and prosody as well as the theoretical modelling, we summarize contributions dealing with intonation in languages that share certain features with Beaver, i.e. tone languages, polysynthetic languages and finally the related Athabaskan languages. After a brief introduction to the grammatical structure and the sociolinguistic situation of Northern Alberta Beaver, the database of the present study is introduced. It consists of narratives and task oriented dialogues as well as recordings elicited with stimuli sets. In the domain of intonation and prosody, three topics are investigated in detail. First, domain initial prosodic strengthening is analyzed. We show that a boundary initial position at higher constituents of the prosodic hierarchy has a lengthening effect on VOT of both aspirated and unaspirated plosives, while nasals are shortened in this context. Additionally, effects of morphological category (stem vs. prefix) and intervocalic position � two mechanisms that have been described for other Athabaskan languages � are also attested for Beaver to some degree. Second, the intonational tones that have been found in the corpus are analyzed within the AM theory. In Northern Alberta Beaver, boundary tones and phrase accents make up the intonational inventory. Most notably, an initial phrase accent is used to mark contrast, which is a device that has not been reported for the marking of information structure in other languages. Lastly, the interaction of information structure with pitch range in complex noun phrases is tested in a controlled experiment. Here, we find that pitch range is significantly wider for new information than for given, which is due to a raising of the top line, while the baseline is not affected to the same extend

Universal and language-specific processing : the case of prosody

A key question in the science of language is how speech processing can be influenced by both language-universal and language-specific mechanisms (Cutler, Klein, & Levinson, 2005). My graduate research aimed to address this question by adopting a crosslanguage approach to compare languages with different phonological systems. Of all components of linguistic structure, prosody is often considered to be one of the most language-specific dimensions of speech. This can have significant implications for our understanding of language use, because much of speech processing is specifically tailored to the structure and requirements of the native language. However, it is still unclear whether prosody may also play a universal role across languages, and very little comparative attempts have been made to explore this possibility. In this thesis, I examined both the production and perception of prosodic cues to prominence and phrasing in native speakers of English and Mandarin Chinese. In focus production, our research revealed that English and Mandarin speakers were alike in how they used prosody to encode prominence, but there were also systematic language-specific differences in the exact degree to which they enhanced the different prosodic cues (Chapter 2). This, however, was not the case in focus perception, where English and Mandarin listeners were alike in the degree to which they used prosody to predict upcoming prominence, even though the precise cues in the preceding prosody could differ (Chapter 3). Further experiments examining prosodic focus prediction in the speech of different talkers have demonstrated functional cue equivalence in prosodic focus detection (Chapter 4). Likewise, our experiments have also revealed both crosslanguage similarities and differences in the production and perception of juncture cues (Chapter 5). Overall, prosodic processing is the result of a complex but subtle interplay of universal and language-specific structure

Differential object indexing in Bulgarian - The role of discourse prominence and predictability

In this study, I argue that object reduplication in Bulgarian is a special encoding strategy that is concerned with discourse management and primarily used to mark (perceived) deviances from expectations with respect to the status of referents in discourse. In particular, I adopt a new perspective by capturing the phenomenon under discussion as a form of differential object marking with a person index, i.e., differential object indexing (DOI). Based on theoretical considerations, corpus evidence and a comprehensive empirical investigation, I reject the interpretation of Bulgarian DOI as a topic marker and suggest a functional explanation in terms of discourse prominence. In addition, I emphasize the role of predictability as a relevant dimension underlying this type of differential marking. I present evidence from acceptability judgment studies and web-based experiments suggesting that DOI in Bulgarian is typically used to (re-)activate or clarify the discourse prominence status of a less prominent referent. In terms of processing, I present the results from an ERP experiment and a visual cueing web-experiment showing that the presence of an object index during online processing modulates (discourse-based) expectations, initiates discourse updating and interacts with (visually induced) salience of a referent. Throughout this study, I elaborate on the association of discourse prominence and language-related predictability with more general cognitive mechanisms, such as attention and predictions

Tonal placement in Tashlhiyt: How an intonation system accommodates to adverse phonological environments

In most languages, words contain vowels, elements of high intensity with rich harmonic structure, enabling the  perceptual retrieval of pitch. By contrast, in Tashlhiyt, a Berber language, words can be composed entirely of voiceless segments. When an utterance consists of such words, the phonetic opportunity for the execution of intonational pitch movements is exceptionally limited. This book explores in a series of production and perception experiments how these typologically rare phonotactic patterns interact with intonational aspects of linguistic structure. It turns out that Tashlhiyt allows for a tremendously flexible placement of tonal events. Observed intonational structures can be conceived of as different solutions to a functional dilemma: The requirement to realise meaningful pitch movements in certain positions and the extent to which segments lend themselves to a clear manifestation of these pitch movements