Perceptual characteristics and learning of Japanese phonemic length contrast by non-native listeners

制度:新 ; 報告番号:甲3515号 ; 学位の種類:博士(国際情報通信学) ; 授与年月日:2012/2/8 ; 早大学位記番号:新585

Bilinguals' and second language learners' knowledge of Japanese syllable structure

The acquisition of second language phonology has been commanding researchers' attention in recent years. The aim of this thesis is to contribute to this area with a study on Japanese as a second language. The thesis explores both the development of phonological competence by post-puberty second language learners and the end state of pre-puberty bilingual acquisition. Reviewing the literature on the theoretical aspects of mora, syllables and syllable structure, we see that the mora is distinctive and plays vital role in Japanese phonology. We next look at the acquisition theories proposed in recent years, and adopt a Universal Grammar-based approach. Comparing first, bilingual and second language acquisition, three research hypotheses are presented: 1) the Mora Assignment Hypothesis, 2) L2 phonological Acquisition and Age Onset Hypothesis, and the 3) Quality and Quantity of Input Hypothesis. To test these hypotheses, a study was designed involving 24 bilingual children and adults, and 94 adult L2 learners of Japanese at varying levels of proficiency. The results provide evidence to support all three research hypotheses. First the data show that the both English-dominant bilinguals and second language learners at all levels deleted morae and all but the beginning second language learners added morae in oral and written production tasks, indicating non-native competence with respect to morae. In addition, learners attempt to preserve the overall mora count. Since English is not a mora sensitive language, the mora conservation exhibited here is from their Japanese. The learners, including English-dominant bilinguals, first become sensitive to the mora and only at a later stage assign segments to the correct mora slot. The difference in performance between English-dominant bilinguals and Japanese-dominant bilinguals was such that by the age of eight, those who had spent more years in Japan demonstrated native phonological competence, whereas the English-dominant bilinguals' performance pointed to non-native competence. With respect to the second and third hypotheses, results from the bilinguals indicate that in addition to age of onset, the amount of exposure to a second language must be taken into account as a factor influencing ultimate attainment. The study also reveals strong influence of literacy in both oral and written production of Japanese

Loan Phonology

For many different reasons, speakers borrow words from other languages to fill gaps in their own lexical inventory. The past ten years have been characterized by a great interest among phonologists in the issue of how the nativization of loanwords occurs. The general feeling is that loanword nativization provides a direct window for observing how acoustic cues are categorized in terms of the distinctive features relevant to the L1 phonological system as well as for studying L1 phonological processes in action and thus to the true synchronic phonology of L1. The collection of essays presented in this volume provides an overview of the complex issues phonologists face when investigating this phenomenon and, more generally, the ways in which unfamiliar sounds and sound sequences are adapted to converge with the native language’s sound pattern. This book is of interest to theoretical phonologists as well as to linguists interested in language contact phenomena

Syllable structure and gemination in Maltese

Little is known on the phonetics and the phonotactic constraints of Maltese. This dissertation sheds light on aspects of syllable structure and geminates in Maltese in order to contribute to understanding how the sound system of the language is structured. The study begins by describing the possible syllable structures in Maltese, carefully defining the onsets, nuclei and codas attested in its syllables. Furthermore, the syllabification processes employed in Maltese are discussed. The dissertation then moves on to its primary focus: geminates in Maltese. In relation to syllable structure, geminates in word-medial position are considered to be ambisyllabic, however, the syllable affiliation of word-initial and word-final geminates is under scrutiny. In addition to word-medial geminates, Maltese also has word-initial and word-final geminates. Previous descriptions of Maltese word-initial geminates (e.g, Azzopardi 1981) have claimed that such geminates are preceded by the epenthetic vowel [ɪ]. Based on a series of production studies, I provide acoustic evidence to examine the articulation of word-initial geminates, and show that this epenthesis occurs almost always when the preceding word ends in a consonant. However, when the preceding word ends in a vowel, there are a number of strategies which speakers employ. Subsequently, in a perception experiment, I show that native speakers of Maltese are insensitive to true word-initial geminates (#ss); results indicate that native speaking Maltese listeners could not discriminate between true word-initial geminates (#ss) and word-initial singletons (#s). However, they were able to discriminate between word-initial geminates that were preceded by the epenthetic vowel (#ɪss) and word-initial singletons (#s). Therefore, I argue that this vowel is part of the phonological representation of word-initial geminates, and I discuss implication of these results for lexical access. In addition, I compare word-initial and word-medial geminates and word-final and word-medial geminates. As expected, the most robust correlate is constriction duration as geminates are always longer than singletons. Other correlates, such as voice onset time, does not serve as a correlate to gemination in Maltese. However, the duration of the vowel before word-medial geminates is shorter than the vowel before word-medial singletons and this can serve as a correlate to gemination in production. Finally, I address the consequences that these results have for phonological representation. Following the current literature on gemination, I propose a moraic representation for geminates in Maltese, regardless of their position in the word

Mechanisms of vowel devoicing in Japanese

The processes of vowel devoicing in Standard Japanese were examined with respect to the phonetic and phonological environments and the syllable structure of Japanese, in comparison with vowel reduction processes in other languages, in most of which vowel reduction occurs optionally in fast or casual speech. This thesis examined whether Japanese vowel devoicing was a phonetic phenomenon caused by glottal assimilation between a high vowel and its adjacent voiceless consonants, or it was a more phonologically controlled compulsory process. Experimental results showed that Japanese high vowel devoicing must be analysed separately in two devoicing conditions, namely single and consecutive devoicing environments. Devoicing was almost compulsory regardless of the presence of proposed blocking factors such as type of preceding consonant, accentuation, position in an utterance, as long as there was no devoiceable vowel in adjacent morae (single devoicing condition). However, under consecutive devoicing conditions, blocking factors became effective and prevented some devoiceable vowels from becoming voiceless. The effect of speaking rate was also generally minimal in the single devoicing condition, but in the consecutive devoicing condition, the vowels were devoiced more at faster tempi than slower tempi, which created many examples of consecutively devoiced vowels over two morae. Durational observations found that vowel devoicing involves not only phonatory change, but also slight durational reduction. However, the shorter duration of devoiced syllables were adjusted at the word level, so that the whole duration of a word with devoiced vowels remained similar to the word without devoiced vowels, regardless of the number of devoiced vowels in the word. It must be noted that there was no clear-cut distinction between voiced and devoiced vowels, and the phonetic realisation of a devoiced vowel could vary from fully voiced to completely voiceless. A high vowel may be voiced in a typical devoicing environment, but its intensity is significantly weaker than those of vowels in a non-devoicing environment, at all speaking tempi. The mean differences of vowel intensities between these environments were generally higher at faster tempi. The results implied that even when the vowel was voiced, its production process moved in favour of devoicing. However, in consecutive devoicing conditions, this process did not always apply. When some of the devoiceable vowels were devoiced in the consecutive devoicing environment, the intensities of devoiceable vowels were not significantly lower than those of other vowels. The results of intensity measurements of voiced vowels in the devoicing and nondevoicing environments suggested that Japanese vowel devoicing was part of the overall process of complex vowel weakening, and that a completely devoiced vowel was the final state of the weakening process. Japanese vowel devoicing is primarily a process of glottal assimilation, but the results in the consecutive devoicing condition showed that this process was constrained by Japanese syllable structure

Lexical quantity in Japanese and Finnish

Despite the fact that Finnish and Japanese differ from each other typologically, remarkable similarities between them can be heard. The most obvious common phonetic feature may be the linguistically distinctive quantity in both vowels and consonants. In the present study I investigated the similarities and differences of lexical quantity in Finnish and Japanese. So far, no large systematic phonetic comparative study on these two languages exists. As background, I discuss the sound systems of each language, including segments, phonotactics, syllable structures, as well as rhythm and timing issues, all being closely related to quantity. The major experiments were concentrated on production and perception of quantity: (1) the segmental, syllabic and word durational ratios of bisyllabic nonsense words with /C1V1(V1)C1(C1)V1(V1) / structure (2-5 moraic words) were measured and (2) using synthetic speech stimuli, the perceptual boundary ranges in equivalent structures were compared and correlated with three fundamental frequency and intensity patterns in order to observe their influence on quantity perception. In addition, I conducted perception tests on the Finnish /(C)VnC1(C1)V / structure with the Japanese speakers, and compared th

Rhotics.New Data and Perspectives

This book provides an insight into the patterns of variation and change of rhotics in different languages and from a variety of perspectives. It sheds light on the phonetics, the phonology, the socio-linguistics and the acquisition of /r/-sounds in languages as diverse as Dutch, English, French, German, Greek, Hebrew, Italian, Kuikuro, Malayalam, Romanian, Slovak, Tyrolean and Washili Shingazidja thus contributing to the discussion on the unity and uniqueness of this group of sounds