published_or_final_version / abstract / Speech and Hearing Sciences / Doctoral / Doctor of Philosophy

Mémoire numérisé par la Direction des bibliothèques de l'Université de Montréal.

Mémoire numérisé par la Direction des bibliothèques de l'Université de Montréal.

An unique Czech fricative thrill - /ř/ - was studied mainly by Dr. Hála and Dr. Chlumský in the first half of the twentieth century. The methods employed were rather simple and the experiments were done on limited sample size. We decided to revisit and extend the results with electropalatography (EPG). Four female and three men participated in the experiments that were based on reading aloud voiced and voiceless /ř/ in various contexts. We dedicated a short part to dynamic characteristics of /ř/ and focused predominantly on the area of linguopalatal contact. We described the points of linguopalatal contact during /ř/ with adjusted anteriority index (CA). The possible factors affecting the CA are discussed. We scrutinized the differences in CA depending on selected factors for the whole group and each participant. The data suggest that thrill /ř/ occurs in the alveolar area. Anteriority index was chiefly dependent on voicing /ř/, type of the read material and also differed among various speakers.

This thesis presents thirteen research papers published between 1987-97, and a summary and discussion of their contribution to the field of developmental speech disorders. The publications collectively constitute a body of work with two overarching themes. The first is methodological: all the publications report articulatory data relating to tongue movements recorded using the instrumental technique of electropalatography (EPG). The second is the clinical orientation of the research: the EPG data are interpreted throughout for the purpose of informing the theory and practice of speech pathology. The majority of the publications are original, experimental studies of lingual articulation in children with developmental speech disorders. At the same time the publications cover a broad range of theoretical and clinical issues relating to lingual articulation including: articulation in normal speakers, the clinical applications of EPG, data analysis procedures, articulation in second language learners, and the effect of oral surgery on articulation. The contribution of the publications to the field of developmental speech disorders of unknown origin, also known as phonological impairment or functional articulation disorder, is summarised and discussed. In total, EPG data from fourteen children are reported. The collective results from the publications do not support the cognitive/linguistic explanation of developmental speech disorders. Instead, the EPG findings are marshalled to build the case that specific deficits in speech motor control can account for many of the diverse speech error characteristics identified by perceptual analysis in previous studies. Some of the children studied had speech motor deficits that were relatively discrete, involving, for example, an apparently isolated difficulty with tongue tiplblade groove formation for sibilant targets. Articulatory difficulties of the 'discrete' or specific type are consistent with traditional views of functional lingual articulation in developmental speech disorders articulation disorder. EPG studies of tongue control in normal adults provided insights into a different type of speech motor control deficit observed in the speech of many of the children studied. Unlike the children with discrete articulatory difficulties, others produced abnormal EPG patterns for a wide range of lingual targets. These abnormal gestures were characterised by broad, undifferentiated tongue-palate contact, accompanied by variable approach and release phases. These 'widespread', undifferentiated gestures are interpreted as constituting a previously undescribed form of speech motor deficit, resulting from a difficulty in controlling the tongue tip/blade system independently of the tongue body. Undifferentiated gestures were found to result in variable percepts depending on the target and the timing of the particular gesture, and may manifest as perceptually acceptable productions, phonological substitutions or phonetic distortions. It is suggested that discrete and widespread speech motor deficits reflect different stages along a developmental or severity continuum, rather than distinct subgroups with different underlying deficits. The children studied all manifested speech motor control deficits of varying degrees along this continuum. It is argued that it is the unique anatomical properties of the tongue, combined with the high level of spatial and temporal accuracy required for tongue tiplblade and tongue body co-ordination, that put lingual control specifically at risk in young children. The EPG findings question the validity of assumptions made about the presence/absence of speech motor control deficits, when such assumptions are based entirely on non-instrumental assessment procedures. A novel account of the sequence of acquisition of alveolar stop articulation in children with normal speech development is proposed, based on the EPG data from the children with developmental speech disorders. It is suggested that broad, undifferentiated gestures may occur in young normal children, and that adult-like lingual control develops gradually through the processes of differentiation and integration. Finally, the EPG fmdings are discussed in relation to two recent theoretical frameworks, that of psycho linguistic models and a dynamic systems approach to speech acquisition.

A diadococinesia (DDC) é a habilidade para realizar repetições rápidas de padrões relativamente simples de contrações musculares opostas, utilizada para avaliar a maturação e a integração neuromotora. A DDC oral e laríngea, associada aos demais procedimentos de avaliação fonoaudiológica, é um importante recurso na compreensão das manifestações dos distúrbios da comunicação. A partir disso, objetivou-se estabelecer valores de referência quanto à normalidade em relação aos resultados da avaliação da DDC oral e laríngea nos diferentes gêneros e faixas etárias de crianças falantes do português brasileiro, bem como analisar a diferença entre os gêneros e faixas etárias. Participaram 150 crianças, distribuídas nas faixas de oito, nove e dez anos de idade. A DDC oral foi avaliada por meio da repetição de \"pa\", ta\", \"ca\" e \"pataca\" e a DDC laríngea, pela repetição de \"a\" e \"i\". Foram utilizados os programas Motor Speech Profile Advanced e Mult Speech Main Program, da Kay Elemetrics Corp. Os parâmetros da DDC foram apresentados como média, mediana e percentil para cada emissão. A comparação entre gênero e idade foi realizada por meio da Análise de Variância a dois critérios e do teste de Tuckey. Quanto à DDC oral, a análise estatística dos resultados demonstrou que, com o avanço da idade: houve aumento do número de emissões de monossílabas por segundo, redução do tempo médio entre essas emissões; houve aumento do coeficiente de variação do período durante a sílaba \"ca\" e aumento do coeficiente de variação do pico da intensidade para a sílaba \"ta\". O número de emissões por segundo da monossílaba \"ta\" foi maior para as meninas que para os meninos. Na emissão da trissílaba, o número de emissões por segundo foi diferente entre os gêneros e, considerando-se os subgrupos de idade e gênero, as meninas de oito anos apresentaram menor número de emissões que todos os demais subgrupos. Quanto à DDC laríngea, com o avanço da idade houve aumento do número de emissões por segundo e períodos mais curtos da vogal \"i\" para as meninas; menor valor do desvio padrão do período e da perturbação do período para essa mesma vogal. Conclui-se que foi possível estabelecer os valores de normalidade da DDC oral e laríngea para o grupo de crianças estudado e que houve diferenças quanto ao gênero e à idade, o que demonstra que o desenvolvimento da DDC oral e laríngea deve ser considerado na avaliação da comunicação oral de crianças. / Diadochokinesis (DDK) is the ability to perform fast repetitions of relatively simple patterns of opposite muscle contractions and it is employed for the evaluation of the neuromotor maturation and integration. The oral and laryngeal DDK, associated with other procedures for the speech evaluation, are important resources in the understanding of communication disorders. Thus, this study was conducted to establish reference values of normality of the outcomes of oral and laryngeal DDK for the different genders and age ranges of Brazilian Portuguese-speaking children, as well as to analyze the presence of difference between genders and among age ranges. The study sample was composed of 150 children aged 8, 9 and 10 years. The oral DDK was evaluated by repetition of \"pa\", \"ta\", \"ka\" and \"pataka\", and laryngeal DDK was assessed by repetition of \"a\" and \"i\". The softwares Motor Speech Profile Advanced and Mult Speech Main Program, of Kay Elemetrics Corp, were employed analysis. The DDK parameters were presented as mean, median and percentile for each emission. Comparison among genders and age ranges was performed by twoway analysis of variance and the Tukey test. Statistical analysis of oral DDK revealed with an increase in age: there were an increase in the number of emissions of monosyllables per second, a reduced mean time between emissions; an increase in the coefficient of variation of the period during the syllable \"ka\", and an increase in the coefficient of variation of the peak intensity for the syllable \"ta\". The number of emissions of the syllable \"ta\" per second was higher for females than to males. In the trisyllabic emission, the number of emissions per second was different among the genders. Besides, regarding the subgroups of age and gender, the 8 year-old-girls showed a decreased number of emissions than the other subgroups. With regard to laryngeal DDK, there was an increased number of emissions per second and shorter periods of vowel \"i\" for females with the increase in age; there was also a smaller standard deviation and perturbations of the period on for this same vowel. It was concluded that it was possible to establish values of normality of oral and laryngeal DDK for the group of children investigated; and that there were differences as to gender and age, which demonstrates that the development of oral and laryngeal DDK should be considered in the evaluation of oral communication of children.

Quando a cidade de Corumbá foi fundada no século XVIII demorou muito tempo para encontrar sua vocação econômica. Assim, dentro das referências revisadas para a elaboração deste trabalho desta tese, não houve constatação de uma vocação econômica específica que tenha relevância pelo menos até os 50 primeiros anos do século XIX, só a partir daí, é que a economia corumbaense teve um rumo, quando prevalece o comércio para a extração de excedente e na qual existe uma articulação devido à navegação e a comunicação com os portos principais da Bacia do Prata. Fato diferente ao acontecido com a cidade logo após o conflito bélico. A delimitação temporal estabelecida para este projeto de pesquisa obedece a alguns critérios adotados para sua definição. A delimitação inicial do período, 1870, se justifica em razão do fim da guerra da Tríplice Aliança, evento este que teve uma relevância marcante para esta região do Brasil, porque foi ocupada pelas tropas paraguaias deixando um rastro de destruição e desolação por toda Corumbá, isso ocorreu justamente no momento em que a cidade estava definindo a sua vocação econômica. Já a escolha do ano de 1914 se deve a alguns fatos como a chegada ao Pantanal a estrada de ferro Noroeste do Brasil, que à época se estendia até as margens do Rio Paraguai, a 70 quilômetros de Corumbá. O clima pantaneiro favorece uma adaptação à atividade pecuária, assim a introdução do gado no início do século XVIII, a atividade pecuária encontrou no sul de Mato Grosso as condições climáticas e ecológicas propícias à sua reprodução e proporcionou a fixação da população em torno das grandes fazendas de criação. Desta maneira, a grande parte riqueza desta parte do Mato Grosso foi o gado, base de sua economia no início do povoamento e também foi o fator de articulação da economia incipiente no Pantanal em Corumbá, quando a atividade agrícola ainda era restrita à zona litoral do país. Esta articulação consiste na ligação com outros setores econômicos. Desta forma, o setor primário consiste na própria exploração da atividade pecuária. No setor secundário estavam as charqueadas que, apesar de não apresentarem uma transformação completa da matéria-prima em outro produto, propiciam agregação de valor à carne. E no setor terciário, a distribuição dos produtos que se daria, num primeiro momento, pela via fluvial e mais adiante, pela ferroviária nos principais centros consumidores. Outros produtos passaram pelo porto corumbaense, mas o mais importante foi borracha, ambos comercializados tanto visando o mercado externo, assim como a importação de produtos para toda a região do Mato Grosso. / When the city of Corumba was founded in the 18th century, it took a long time for finding its economic vocation. Thus, among the references herein revised, we found no evidence of a specific and relevant vocation at least until the first 50 years of the 19th century. From that moment on, the corumbaense economy took a direction towards the commerce of the extractions, articulated by the navigation growth and the communication among the main harbors of the Prata river basin, what differs from what happened to the city right after the war. The temporal limits herein established followed some criteria and the starting point of 1870 was chosen for marking the end of the War of Triple Alliance, whose event was strongly relevant for this Brazilian region because the troops occupation of the territories brought together a trail of destruction and desolation all over Corumba city, what happened when the economic vocation was being chosen. The year of 1914 closed the period of research. It coincided with the arrival of the railroad Noroeste do Brasil [Northeast of Brazil], which, at that time, reached the margins of Paraguay river, 70 km away from Corumba. The pantanalian climate favored the adaptation of livestock activity, which dated the beginning of the 18th century, especially in south of the Mato Grosso state, whose climate and ecologic conditions were propitious to reproduction, proportioning the formation of a new villages around the big livestock farms. Thus, the great wealth of this part of the state was based on livestock, which was the basis of the economy during the population settlement and were the main economic factor of the in both Pantanal and Corumba regions in a period which the agriculture was still restricted to the coastal areas of Brazil,whose articulation was bonded to other economic sectors. Thus, the primary sector consisted on the livestock itself. The secondary sector was formed by the charqueadas [area destined to jerk beef maturation] which, although showed no modification on the raw materials, added financial value to the meat. The tertiary sector was the distribution of the products to consume centers, firstly done by waterways and later by railways. Other products were commercialized on corumbaense harbor the most important one was the rubber and their destination were both the foreign market and the importation around Mato Grosso state.

Hypokinetic dysarthria is a speech disorder that commonly occurs in individuals with Parkinson’s disease (PD). However, little is known about the speech characteristics and the effects of speech treatment on the speech of Mandarin speakers with hypokinetic dysarthria (henceforth, Mandarin speakers with PD). The purpose of this dissertation was to investigate the effects of intensive voice treatment on the speech intelligibility and acoustics of this population. This dissertation consisted of three papers. The first paper, “Acoustic and perceptual speech characteristics of native Mandarin speakers with Parkinson’s disease,” investigated the general speech characteristics of 11 Mandarin speakers with PD. Intelligibility and acoustic outcomes were reported and compared to seven age- and gender-matched neurologically healthy controls. Findings from this study showed that Mandarin speakers with PD exhibited decreased intelligibility, local pitch variation, vowel space area, speech rate, and rate variation. The second paper, “Effects of Loudness and Rate Manipulation Strategies on Speech Intelligibility and Acoustics of Mandarin Speakers With Parkinson’s Disease,” examined the effects of cueing to increase loudness and reduce speech rate on speech intelligibility and acoustics. Acoustic features including speech intensity, pitch range, pause duration, pause frequency, articulation rate, and vowel space area across 11 Mandarin speakers with PD were analyzed. The relationship between speech intelligibility and acoustic features was reported. Results showed that cueing for loud speech significantly increased intelligibility, but cueing for slow speech did not. Different cues had differential effects on the selected acoustic features. Cueing for loud speech resulted in increased vocal intensity and cueing for slow speech resulted in reduced articulation rate and increased pause frequency. In the loud speaking condition, greater vocal intensity and larger vowel space contributed to increased intelligibility, whereas in the slow condition, increased intensity, vowel space, as well as articulation rate, showed a trend toward contributing to increased intelligibility. The third paper, “The Effects of Intensive Voice Treatment on Intelligibility in Mandarin Speakers with Parkinson’s Disease: Acoustic and perceptual findings,” investigated the short- and long-term effects of intensive voice treatment (Lee Silverman Voice Treatment LOUD) on speech intelligibility and acoustics of nine Mandarin speakers with PD. All speakers showed increased intelligibility from pretreatment to immediate post-treatment, and the improvement was maintained at the 6-month follow-up. Five acoustic features were analyzed. Speech intensity, vowel space, and speech rate changed significantly in positive directions immediately post-treatment, and the increases were retained up to six months. Global pitch variation increased immediately post-treatment but not at the 6-month follow-up. No changes were found in local pitch variation following treatment. Self-reported intelligibility, voice quality, confidence, frustration level, and communicative participation changed positively immediately after the completion of treatment and at the 6-month follow-up. To conclude, the speech characteristics of Mandarin speakers with PD were generally consistent with those of English speakers with PD, except that speech was slower in the Mandarin speakers. Cueing to increase loudness and reduce rate had different effects on speech intelligibility and production, with louder speech yielding greater intelligibility and acoustic benefits. Following intensive voice treatment (LSVT LOUD), Mandarin speakers with PD increased their vocal intensity. Speech intelligibility, vowel space, global pitch variation and speech rate increased as a result of the treatment. Thus, some differences between Mandarin and English dysarthria and effects of cueing might be present, but as for English speakers, intensive treatment (specifically LSVT LOUD) focusing on increasing vocal intensity shows promise for increasing intelligibility and quality of life in Mandarin speakers with hypokinetic dysarthria. Future studies should include a larger number of participants and probe the effects of behavioral speech modifications and intensive voice treatment on lexical tone, and consider which physiological mechanisms might be associated with production of lexical tone, given that lexical tone is often crucial to differentiating word meaning in Mandarin.

This study examined the effect of context on the association between formant trajectories and tongue and lip kinematics in the American English diphthongs /aɪ/ and /aʊ/. Seventeen native speakers of American English had electromagnetic sensors placed on their tongue and lips to record kinematic signals that were time-aligned with the corresponding acoustic recording. Speakers produced the diphthongs in isolation, in a single word rVl context, in a phrase hVd context, and in a sentence context. Kinematic data and the F1 and F2 trajectories were extracted from the middle 50% of each diphthong production. To allow direct comparison of signals with different units of measurement, all data were converted to z-scores. The z-score records were plotted together on common axes. For each tracked sensor from each diphthong production, an absolute difference between the kinematic and acoustic variables was calculated. Average z-score difference sums were calculated for each speaker's /aɪ/ and /aʊ/ production in each context, and this measure was called the Acoustic Kinematic Disparity Index (AKDI). A repeated measures ANOVA was used to test for main context effects on the AKDI, with concurrent contrasts to test for differences between the baseline (isolated diphthong) condition and the more complex phonetic contexts. The results revealed that context has a significant impact on acoustic and kinematic relationships. The sentence context resulted in the highest number of significantly different AKDI values when compared to the isolated condition, the single word rVl context resulted in the second highest number, and the phrase level hVd context resulted in the least differences. These findings suggest, therefore, that more complex phonetic contexts have a greater effect on the acoustic and kinematic relationship. These findings imply that caution is warranted in relying on acoustics to draw inferences about articulator movements in complex phonetic contexts. These results further indicate that the investigation of sounds produced in one context does not necessarily allow a straightforward generalization to other contexts.

In this dissertation, I examine the articulation of hip-hop in the mid-1980s as it emerged onto the national stage of American popular culture. Using Articulation Theory, I weave together an argument explaining how and why hip-hop went from being articulated as a set of multicultural and inclusive practices, organized around breaking, graffiti, and DJing, to being articulated to a violent, misogynistic, and homophobic hyper-masculine representation of blackness as essentially rap music culture. In doing so I also argue that there are real political, social, racial, cultural, and ideological implications to this shift in articulation; that something is at stake in defining hip-hop as both black and rap music culture. I put forward this argument by making three distinct steps over the course of this dissertation. First, I identify a change in how hip-hop was represented and thus articulated in popular media. Through an intertextual analysis of the hip-hopsploitation genre films I show that early hip-hop was being represented primarily as a set of cultural practices cohering around breaking, graffiti, and DJing rather than the now dominant articulation as rap music culture. Next I set forth one possible reason for this shift within the limiting conditions set by the available media technologies and means of commodification. The visual nature of hip-hop's early articulation coupled with the economic inaccessibility of consumer home video made breaking and graffiti difficult to commodify compared to rapping as an aural element. Using "technological determinist" theorists like McLuhan, Innis, and Kittler, I argue that understanding how hip-hop as been historically constructed requires analyzing the limiting effect that the material conditions of media technologies have on the production of hip-hop. Finally, I offer a second, racial and cultural reason for this shift in articulation, and begin identifying some of the significance of this shift. A key aspect of the articulation of hip-hop as rap music is the further connection to blackness. This connection may function to maintain white patriarchal hegemony by displacing it on the black body via rap music: a complex dynamic of disidentification and appropriation.