9 research outputs found
Non-assimilatory vowel raising in a variety of Brazilian Portuguese : effects of coarticulation of CV sequences and vowel dispersion
Este artigo trata da motivação fonĂ©tica do alçamento sem motivação aparente das vogais mĂ©dias pretĂŽnicas /e, o/ (desconto ~ d[i]sconto, c[o]stela ~ c[u] stela) no portuguĂȘs brasileiro. Realizase anĂĄlise quantitativa (LABOV, 1972) em dados de fala da variedade de Porto Alegre, com que se confirmam os efeitos favorecedores de consoantes palatais, velares, labiais precedentes ou seguintes no alçamento das mĂ©dias, registrados na literatura (KLUNCK, 2007; CRUZ, 2010; MONARETTO, 2013). A inspeção acĂșstica de dados e o exame de literatura sobre coarticulação (GOLDSTEIN; BYRD; SALTZMAN, 2006) sugerem que o alçamento seja processo variĂĄvel condicionado por mĂșltiplos fatores, entre eles a coarticulação de sequĂȘncias CV e a dispersĂŁo vocĂĄlica (MADDIESON, 1984; LINDBLOM, 1986).This paper discusses non-assimilatory vowel raising of the pretonic mid vowels /e, o/ (d[e]sconto ~ d[i]sconto âdiscountâ, c[o]stela ~ c[u]stela âribâ) in Brazilian Portuguese. A quantitative analysis (LABOV, 1972) of speech data from Porto Alegre confirms the favoring effects of preceding and following palatal, velar, labial consonants on mid vowel raising as previously attested (KLUNCK, 2007; CRUZ, 2010; MONARETTO, 2013). The acoustic inspection of the data and the review of the literature on coarticulation (GOLDSTEIN; BYRD; SALTZMAN, 2006) suggest that mid vowel raising is a variable process conditioned by multiple factors, including CV coarticulation and vowel dispersion (MADDIESON, 1984; LINDBLOM, 1986)
A tentative argument for regional quality targets in assimilating schwa
Amerikanenglannin redusoitunut ƥvaa-vokaali tuotetaan puheessa laadultaan huomattavan monimuotoisena. Kirjallisuudessa ei kuitenkaan vallitse selkeÀÀ kÀsitystÀ siitÀ, mitkÀ tekijÀt ehdollistavat tÀtÀ ƥvaan laatuvaihtelua, ja etenkin sen mahdollinen sosiaalinen ulottuvuus on jÀÀnyt aiemmissa tutkimuksissa varsin vÀhÀlle huomiolle. TÀssÀ tutkielmassa pyritÀÀnkin selvittÀmÀÀn, millainen vaikutus puhujan alueellisella murteella on hÀnen tuottamansa ƥvaan akustiikkaan.
Tutkimukseen valittiin 21 informanttia muutamista Yhdysvaltain etelÀisistÀ ja lÀntisistÀ osavaltioista. Informanttien haastattelunauhoitteista poimittiin analyysiin yhteensÀ 433 ƥvaan F1- ja F2-formanttiarvot siten kuin ne esiintyivÀt sanassa the. AnalyysissÀ havaittiin, ettÀ etelÀisten puhujien ƥvaat keskittyivÀt vokaalien [u,U] tuntumaan, kun taas lÀntisten informanttien ƥvaat asettuivat vokaalien [i,u] vÀliin. Tulokset antoivat aihetta kysyÀ, onko etelÀinen ƥvaa sulautunut takavokaaleihin [u,U]. KysymystÀ varten suoritettiin jatkotutkimus, johon valittiin yksi ensimmÀisen tutkimuksen etelÀisistÀ puhujista. Puhujalta mitattiin 66 ƥvaan ja 45 [U]:n formantit. NÀitÀ tarkastellessa löydettiin tilastollista viitettÀ siitÀ, ettÀ puhujan ƥvaa oli saattanut sulautua vokaaliin [U].
Tulostensa pohjalta tutkielma ehdottaa, ettÀ the-sanassa esiintyvÀssÀ amerikanenglannin ƥvaassa saattaa toteutua puhujan alueellista murretta mukaileva tavoitevaihe siitÀ huolimatta, ettÀ tÀmÀ vokaali on samanaikaisesti huomattavasti kontekstiinsa assimiloitunut. Tavoitevaihe nÀyttÀisi lÀhtökohtaisesti sijoittuvan F2:ssa vokaalialueen keskelle, ollen kuitenkin etelÀisten puhujien kohdalla altis siirtymÀÀn taaemmas kohti vokaalilaatuja [u,U].Siirretty Doriast
Velarâvowel Coarticulation in a Virtual Target Model of Stop Production
Velarâvowel coarticulation in English, resulting in so-called velar fronting in front vowel contexts, was studied using ultrasound imaging of the tongue during /k/ onsets of monosyllabic words with no coda or a labial coda. Ten native English speakers were recorded and analyzed. A variety of coarticulation patterns that often appear to contain small differences in typical closure location for similar vowels was found. An account of the coarticulation pattern is provided using a virtual target model of stop consonant production where there are two /k/ allophones in English, one for front vowels and one for non-front vowels. Small differences in closure location along the palate between productions within each context are the result of the trajectory of movement of the tongue from the vowel to vowel through the virtual target beyond the limit of the palate. The overall pattern is thus seen as a combination of a large planned allophonic difference between consonant closure targets and smaller phonetic differences for each particular vowel quality that are the result of coarticulation
Involvement of the speech production system in prediction during comprehension: an articulatory imaging investigation
This thesis investigates the effects in speech production of prediction during speech comprehension.
The topic is raised by recent theoretical models of speech comprehension, which suggest a more
integrated role for speech production and comprehension mechanisms than has previously been
posited. The thesis is specifically concerned with the suggestion that during speech comprehension
upcoming input is simulated with reference to the listenerâs own speech production system by way of
efference copy.
Throughout this thesis the approach taken is to investigate whether representations elicited during
comprehension impact speech production. The representations of interest are those generated
endogenously by the listener during prediction of upcoming input. We investigate whether predictions
are represented at a form level within the listenerâs speech production system. We first present an
overview of the relevant literature. We then present details of a picture word interference study
undertaken to confirm that the item set employed elicits typical phonological effects within a
conventional paradigm in which the competing representation is perceptually available. The main
body of the thesis presents evidence concerning the nature of representations arising during prediction,
specifically their effect on speech output. We first present evidence from picture naming vocal
response latencies. We then complement and extend this with evidence from articulatory imaging,
allowing an examination of pre-acoustic aspects of speech production.
To investigate effects on speech production as a dynamic motor-activity we employ the Delta method,
developed to quantify articulatory variability from EPG and ultrasound recordings. We apply this
technique to ultrasound data acquired during mid-sagittal imaging of the tongue and extend the
approach to allow us to explore the time-course of articulation during the acoustic response latency
period. We investigate whether prediction of anotherâs speech evokes articulatorily specified
activation within the listenerâs speech production system
The findings presented in this thesis suggest that representations evoked as predictions during speech
comprehension do affect speech motor output. However, we found no evidence to suggest that
predictions are represented in an articulatorily specified manner. We discuss this conclusion with
reference to models of speech production-perception that implicate efference copies in the generation
of predictions during speech comprehension
The involvement of the speech production system in prediction during comprehension
This thesis investigates the effects in speech production of prediction during speech comprehension. The topic is raised by recent theoretical models of speech comprehension, which suggest a more integrated role for speech production and comprehension mechanisms than has previously been posited. The thesis is specifically concerned with the suggestion that during speech comprehension upcoming input is simulated with reference to the listenerâs own speech production system by way of efference copy.Throughout this thesis the approach taken is to investigate whether representations elicited during comprehension impact speech production. The representations of interest are those generated endogenously by the listener during prediction of upcoming input. We investigate whether predictions are represented at a form level within the listenerâs speech production system. We first present an overview of the relevant literature. We then present details of a picture word interference study undertaken to confirm that the item set employed elicits typical phonological effects within a conventional paradigm in which the competing representation is perceptually available. The main body of the thesis presents evidence concerning the nature of representations arising during prediction, specifically their effect on speech output. We first present evidence from picture naming vocal response latencies. We then complement and extend this with evidence from articulatory imaging, allowing an examination of pre-acoustic aspects of speech production.To investigate effects on speech production as a dynamic motor-activity we employ the Delta method, developed to quantify articulatory variability from EPG and ultrasound recordings. We apply this technique to ultrasound data acquired during mid-sagittal imaging of the tongue and extend the approach to allow us to explore the time-course of articulation during the acoustic response latency period. We investigate whether prediction of anotherâs speech evokes articulatorily specified activation within the listenerâs speech production systemThe findings presented in this thesis suggest that representations evoked as predictions during speech comprehension do affect speech motor output. However, we found no evidence to suggest that predictions are represented in an articulatorily specified manner. We discuss this conclusion with reference to models of speech production-perception that implicate efference copies in the generation of predictions during speech comprehension
AN ARTICULATORY-ACOUSTIC INVESTIGATION OF TIMING AND COORDINATION IN THE FLUENT SPEECH OF PEOPLE WHO STAMMER
This thesis investigates Wingateâs Fault-Line hypothesis (1988) which suggests that disfluencies in people who stammer (PWS) result from a deficit in transition from consonant to vowel (CV) thereby implying that stammering as a motor-control disorder would affect transitions even when not perceptually salient. To test this proposal, we explored the perceptually fluent speech of PWS using instrumental analysis (ultrasound and acoustic) to determine the underlying pervasiveness of disfluencies in this group as compared to people who do not stammer (PNS).
Following fluency screening of recorded utterances, we applied acoustic and articulatory analysis techniques to perceptually fluent utterances of 9 PWS and 9 typical speakers in order to identify indicators of disfluency in the transition from syllable onsets to the following vowel. Measures of acoustic duration, locus equation and formant slope offer insights into timing and degree of coarticulation. The articulatory ultrasound tongue imaging technique moreover provides kinematic information of the tongue. A novel technique was applied to dynamically analyse and quantify the tongue kinematics in transition. This allowed us to treat the perceptually fluent speech of PWS as an ongoing time-situated process.
Both acoustic and articulatory findings indicate by-group differences in timing, whereby PWS are overall slower and more variable in the execution of CV transitions when compared to typical speakers (PNS). The findings from both instrumental approaches also indicate differences in coordination, suggesting that PWS coarticulate to a lesser extent than PNS. Overall, these findings suggest that PWS exhibit a global deficit in CV transition that can be observed in perceptually fluent as well as stammered speech. This is in keeping with the predictions of Wingateâs Fault-Line hypothesis.
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The fact that the conclusions from the acoustic and articulatory measures are coherent, shows that acoustic measures may be sufficient to act as a proxy for articulatory measures