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Doctor of Philosophy / Despite the number of bilinguals and speakers of English and Mandarin worldwide, up till now there have been no investigations of stuttering in any of the Chinese languages, or in bilinguals who speak both English and Mandarin. Hence, it is not known whether stuttering behavior in Mandarin mimics that in English, or whether speech restructuring techniques such as Prolonged Speech produce the same fluency outcomes in Mandarin speakers as they do for English speakers. Research into stuttering in bilinguals is available but far from adequate. Although the limited extant studies show that bilinguals who stutter (BWS) may stutter either the same or differently across languages, and that treatment effects in one language can automatically carry over to the other language, it is unclear whether these findings are influenced by factors such as language dominance or language structure. These issues need to be clarified because speech language pathologists (SLPs) who work with bilinguals often do not speak the dominant language of their clients. Thus, the language of assessment and treatment becomes an important clinical consideration. The aim of this thesis was to investigate (a) whether the severity and type of stuttering was different in English and Mandarin in English-Mandarin bilingual adults, (b) whether this difference was influenced by language dominance, (c) whether stuttering reductions in English generalized to Mandarin following treatment in English only, and (d) whether treatment generalization was influenced by language dominance. To achieve these aims, a way of establishing the dominant language in bilinguals was a necessary first step. The first part of this thesis reviews the disorder of stuttering and the treatment for adults who stutter, the differences between English and Chinese languages, and stuttering in bilinguals. Part Two of this thesis describes the development of a tool for determining language dominance in a multilingual Asian population such as that found in Singapore. This study reviews the complex issues involved in assessing language dominance. It presents the rationale for and description of a self-report classification tool for identifying the dominant language in English-Mandarin bilingual Singaporeans. The decision regarding language dominance was based on a predetermined set of criteria using self-report questionnaire data on language proficiency, frequency of language use, and domain of language use. The tool was administered to 168 English-Mandarin bilingual participants, and the self-report data were validated against the results of a discriminant analysis. The discriminant analysis revealed a reliable three-way classification into English-dominant, Mandarin-dominant, and balanced bilinguals. Scores on a single word receptive vocabulary test supported these dominance classifications. Part Three of this thesis contains two studies investigating stuttering in BWS. The second study of this thesis examined the influence of language dominance on the manifestation of stuttering in English-Mandarin BWS. Results are presented for 30 English-Mandarin BWS who were divided according to their bilingual classification group: 15 English-dominant, four Mandarin-dominant, and 11 balanced bilinguals. All participants underwent comprehensive speech evaluations in both languages. The English-dominant and Mandarin-dominant BWS were found to exhibit greater stuttering in their less dominant language, whereas the balanced bilinguals evidenced similar levels of stuttering in both languages. An analysis of the types of stutter using the Lidcombe Behavioral Data Language showed no significant differences between English and Mandarin for all bilingual groups. In the third study of this thesis, the influence of language dominance on the generalization of stuttering reductions from English to Mandarin was investigated. Results are provided for seven English-dominant, three Mandarin-dominant, and four balanced bilinguals who underwent a Smooth Speech intensive program in English only. A comparison of stuttering between their pretreatment scores and three posttreatment interval scores indicated that the degree of fluency transfer from the treated to the untreated language was disproportionate. English-dominant and Mandarin-dominant participants showed greater fluency improvement in their dominant language even if this language was not directly treated. In the final chapter, Part Four, a hypothesis is provided to explain the findings of this thesis. A discussion of the limitations of the thesis and suggestions for future research are also presented. The chapter concludes with a summary of the main contributions that this thesis makes to the field of stuttering in bilinguals.

Doctor of Philosophy / Despite the number of bilinguals and speakers of English and Mandarin worldwide, up till now there have been no investigations of stuttering in any of the Chinese languages, or in bilinguals who speak both English and Mandarin. Hence, it is not known whether stuttering behavior in Mandarin mimics that in English, or whether speech restructuring techniques such as Prolonged Speech produce the same fluency outcomes in Mandarin speakers as they do for English speakers. Research into stuttering in bilinguals is available but far from adequate. Although the limited extant studies show that bilinguals who stutter (BWS) may stutter either the same or differently across languages, and that treatment effects in one language can automatically carry over to the other language, it is unclear whether these findings are influenced by factors such as language dominance or language structure. These issues need to be clarified because speech language pathologists (SLPs) who work with bilinguals often do not speak the dominant language of their clients. Thus, the language of assessment and treatment becomes an important clinical consideration. The aim of this thesis was to investigate (a) whether the severity and type of stuttering was different in English and Mandarin in English-Mandarin bilingual adults, (b) whether this difference was influenced by language dominance, (c) whether stuttering reductions in English generalized to Mandarin following treatment in English only, and (d) whether treatment generalization was influenced by language dominance. To achieve these aims, a way of establishing the dominant language in bilinguals was a necessary first step. The first part of this thesis reviews the disorder of stuttering and the treatment for adults who stutter, the differences between English and Chinese languages, and stuttering in bilinguals. Part Two of this thesis describes the development of a tool for determining language dominance in a multilingual Asian population such as that found in Singapore. This study reviews the complex issues involved in assessing language dominance. It presents the rationale for and description of a self-report classification tool for identifying the dominant language in English-Mandarin bilingual Singaporeans. The decision regarding language dominance was based on a predetermined set of criteria using self-report questionnaire data on language proficiency, frequency of language use, and domain of language use. The tool was administered to 168 English-Mandarin bilingual participants, and the self-report data were validated against the results of a discriminant analysis. The discriminant analysis revealed a reliable three-way classification into English-dominant, Mandarin-dominant, and balanced bilinguals. Scores on a single word receptive vocabulary test supported these dominance classifications. Part Three of this thesis contains two studies investigating stuttering in BWS. The second study of this thesis examined the influence of language dominance on the manifestation of stuttering in English-Mandarin BWS. Results are presented for 30 English-Mandarin BWS who were divided according to their bilingual classification group: 15 English-dominant, four Mandarin-dominant, and 11 balanced bilinguals. All participants underwent comprehensive speech evaluations in both languages. The English-dominant and Mandarin-dominant BWS were found to exhibit greater stuttering in their less dominant language, whereas the balanced bilinguals evidenced similar levels of stuttering in both languages. An analysis of the types of stutter using the Lidcombe Behavioral Data Language showed no significant differences between English and Mandarin for all bilingual groups. In the third study of this thesis, the influence of language dominance on the generalization of stuttering reductions from English to Mandarin was investigated. Results are provided for seven English-dominant, three Mandarin-dominant, and four balanced bilinguals who underwent a Smooth Speech intensive program in English only. A comparison of stuttering between their pretreatment scores and three posttreatment interval scores indicated that the degree of fluency transfer from the treated to the untreated language was disproportionate. English-dominant and Mandarin-dominant participants showed greater fluency improvement in their dominant language even if this language was not directly treated. In the final chapter, Part Four, a hypothesis is provided to explain the findings of this thesis. A discussion of the limitations of the thesis and suggestions for future research are also presented. The chapter concludes with a summary of the main contributions that this thesis makes to the field of stuttering in bilinguals.

Despite the rise of globalization and increasing multilingualism, the effect of language dominance on thought and perception in bilingual speakers has received little attention. This study examines the semantic networks of Spanish-English bilingual adults and monolingual English-speaking peers to determine whether language dominance structures the semantic space of a bilingual speaker to more closely match the semantic space of a monolingual speaker of the dominant language. It is predicted that semantic ratings produced by English-dominant bilinguals will correlate more closely to the semantic ratings of monolingual English-speaking participants than ratings produced by Spanish-dominant bilinguals. Spanish-English bilinguals (n=20) completed the Bilingual Language Profile regarding language use, attitudes, and fluency (Birdsong, Gertken, & Amengual, 2012). Spanish-English bilingual participants and monolingual English-speaking participants (n=20) then rated a series of translationally equivalent nouns (n=80) according to sound, color, morality, valence, size, and position. Using these ratings, a Euclidean distance matrix containing the ratings of English-dominant bilinguals, Spanish-dominant bilinguals, and English monolinguals was analyzed within and between groups using hierarchical cluster analysis, matrix comparisons (Mantel Tests), Spearman correlations, and qualitative k-means clustering analysis. Results suggest the possibility of dynamic interconnection between languages, with semantic connection weights determined by the dominant language (Malt et al, 2015). However, more research is needed to draw firm conclusions. / Communication Sciences

Referential null objects are attested in several varieties of Spanish that are in contact with other languages. Some of them coexist with languages with rich agreement system, e.g., Spanish in contact with Quechua and Basque (cf., e.g., Landa 1995; Franco 1993; Sánchez 1998). The availability of such null objects is thought to be due to some type of transfer from the contact language. As such, bilingualism and language dominance are relevant in determining whether or not a speaker drops objects. One objective of this work is to examine the Spanish language forms of Basque-Spanish speakers of disparate levels of Spanish and Basque abilities, with the aim of determining the role of dominance in the occurrence of null objects. Results obtained from naturalistic data contradict previous claims on dominance. Statistical analysis concludes that dominance is not a factor that determines the occurrence of null objects. Furthermore, closer analysis of the data suggests that these findings challenge previous hypotheses regarding the semantic nature that licenses null objects. Data conflicts with claims on animacy being the feature that allows object drop demonstrating that the picture is less clear than suggested in earlier proposals. / text

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The present body of research examined adult bilinguals who acquired a second language (L2) from an early age and who subsequently developed language dominance in that language. The question investigated is whether such "early L2-dominant bilinguals" attain a native level of proficiency in their second language. This possibility was explored by comparing bilinguals who had Cantonese L1 (logographic, morphosyllabic), Vietnamese L1 (alphabetic, morphosyllabic) or some "Other" L1 (alphabetic, non-morphosyllabic) to English monolinguals on various tasks in English (L2). The ability to process spoken stimuli was examined using phoneme deletion, spelling-to-dictation, and auditory comprehension tasks. The results showed that bilinguals from all backgrounds had greater difficulty than monolinguals on tasks that required sublexical skills, with the morphosyllabic groups performing the most poorly. The processing of print was investigated using reading aloud and reading comprehension tasks. In contrast to the auditory tasks, only Cantonese L1 bilinguals displayed any discernable difference from monolinguals on reading. Cantonese L1 bilinguals did, however, outperform monolinguals on orthographic memory tasks, such as the spelling of idiosyncratic L2 words. The findings therefore indicated that L1 linguistic structure influences L2 processing in adulthood, despite the former having become subordinate. In order to elucidate whether transfer effects arise solely from early exposure to L1, or whether L1 maintenance also plays a role, the L1 and L2 proficiency of a separate sample of Cantonese L1 bilinguals was examined. However, no meaningful relationship between L1 and L2 proficiency was found. Finally, a sample of late bilinguals were also tested in order to determine whether the L1-specific effects observed in early bilinguals are simply an attenuated version of those in late bilinguals,. The results revealed that the development of language dominance in L2 does lead to qualitatively different outcomes in L2 for early bilinguals. The findings from the present research are most consistent with the Competition Model (e.g., Hernandez, Li, & MacWhinney, 2005), which espouses the notions of L1 transfer and entrenchment to explain second language acquisition. Overall, the research indicates that native attainment in L2 is not assured for all early L2-dominant bilinguals.

In the phonological integration of loanwords, the original structures of the donor language can either be adopted as innovations or adapted to the recipient language. This dissertation investigates how structural (i.e. phonetic, phonological, morpho-phonological) and non-structural (i.e. sociolinguistic and psycholinguistic) factors interact in determining which of these two integration strategies is preferred. Factors that affect the accuracy of the structure’s perception and production in the donor language as a result of its acquisition as a second language are given special consideration. The three studies in the dissertation examine how the same phonological structure from different donor languages is integrated into the same recipient language Turkish by two different types of initial borrowers: elite bilinguals in Turkey and heritage bilinguals in Sweden. The three investigated structures are word-final [l] after back vowels, long segments in word-final closed syllables, and word-initial onset clusters. The main hypothesis is that adoption will be more prevalent in heritage bilinguals than in elite bilinguals. Four necessary conditions for adoption are identified in the analysis. Firstly, the donor-language structure must have high perceptual salience. Secondly, the borrowers must have acquired the linguistic competence to produce a structure accurately. Thirdly, the borrowers must have sufficient sociolinguistic incentive to adopt a structure as an innovation. Fourthly, prosodic structures require higher incentive to be adopted than segments and clusters of segments. The main hypothesis is partially confirmed. The counterexamples involve either cases where the salience of the structure was high in the elite bilinguals’ borrowing but low in the heritage bilinguals’ borrowing, or cases where the structure’s degree of acquisition difficulty was low. Therefore, it is concluded that structural factors have the final say in the choice of integration strategy. / <p>At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 3: Submitted. </p>

The French colonizer from 1912–1956 brought not only the French language to Morocco but also a colonial administration that reinforced divisions between various indigenous social groups. European, Jewish, Muslim, and Berber communities were segregated into separate schools providing different levels of French-language education. As a result, French linguistic dominance and economic opportunity were assured among some groups more thoroughly than others. Acquisition of the French language for European and Jewish communities through advanced educational opportunities at the European lycées and Jewish Alliance Israélite Universelle granted certain higher educational, economic, and administrative privileges within the colonial administration and workforce. Meanwhile, those attending schools created for Muslim and Berber Moroccans where curricula insisted on rudimentary French skills were unable to seek advanced educational or economic opportunity. This research describes the different types of access to the French language that were intended for the diverse European, Jewish, Berber, and Arab speech communities through the various educational institutions created by the French government during the French protectorate in Morocco. Through the application of Bourdieu’s language market theory, this dissertation examines the ways that access became linked to the job market and the attainment of symbolic, economic, and cultural capital. This research offers explanations of how language shift occurred among European and Jews in Morocco and how French continued to confer socioeconomic value long after independence, despite efforts to oust the “colonizer’s language” for all Moroccans. Furthermore, in contradiction to Bourdieu’s language market theory, this research exposes how multiple language markets in Morocco emerged for Muslim and Berber communities as a result of access to different kinds of instruction and how both French and Arabic became legitimate languages with very different social functions. / text

The present body of research examined adult bilinguals who acquired a second language (L2) from an early age and who subsequently developed language dominance in that language. The question investigated is whether such "early L2-dominant bilinguals" attain a native level of proficiency in their second language. This possibility was explored by comparing bilinguals who had Cantonese L1 (logographic, morphosyllabic), Vietnamese L1 (alphabetic, morphosyllabic) or some "Other" L1 (alphabetic, non-morphosyllabic) to English monolinguals on various tasks in English (L2). The ability to process spoken stimuli was examined using phoneme deletion, spelling-to-dictation, and auditory comprehension tasks. The results showed that bilinguals from all backgrounds had greater difficulty than monolinguals on tasks that required sublexical skills, with the morphosyllabic groups performing the most poorly. The processing of print was investigated using reading aloud and reading comprehension tasks. In contrast to the auditory tasks, only Cantonese L1 bilinguals displayed any discernable difference from monolinguals on reading. Cantonese L1 bilinguals did, however, outperform monolinguals on orthographic memory tasks, such as the spelling of idiosyncratic L2 words. The findings therefore indicated that L1 linguistic structure influences L2 processing in adulthood, despite the former having become subordinate. In order to elucidate whether transfer effects arise solely from early exposure to L1, or whether L1 maintenance also plays a role, the L1 and L2 proficiency of a separate sample of Cantonese L1 bilinguals was examined. However, no meaningful relationship between L1 and L2 proficiency was found. Finally, a sample of late bilinguals were also tested in order to determine whether the L1-specific effects observed in early bilinguals are simply an attenuated version of those in late bilinguals,. The results revealed that the development of language dominance in L2 does lead to qualitatively different outcomes in L2 for early bilinguals. The findings from the present research are most consistent with the Competition Model (e.g., Hernandez, Li, & MacWhinney, 2005), which espouses the notions of L1 transfer and entrenchment to explain second language acquisition. Overall, the research indicates that native attainment in L2 is not assured for all early L2-dominant bilinguals.