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Why Does the Vowel Space Area as an Acoustic Metric Fail to Differentiate Dysarthric from Normal Vowel Articulation and what can be Done About It?

100%
Sapir S., Połczyńska M., Tobin Y.
Poznań Studies in Contemporary Linguistics
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2009
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vol. 45
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issue 2
301-311
EN
Background. The vowel space area (VSA) has been used as an acoustic metric of dysarthric vowel articulation, but with varying degrees of success. Here we test the hypothesis that the failure of the VSA to differentiate dysarthric from normal vowel articulation has to do in part with statistical "noise" that is introduced by insensitivity of Euclidean distances that define the VSA to vowel centralisation.Methods. Differences in vowel production between 5 dysarthric young men post traumatic brain injury (TBI) and 5 young men who served as healthy controls (HC) were tested with four acoustic metrics: the triangular VSA, constructed with the first (F1) and second (F2) formants of the vowels /i/, /u/, /a/, and the Euclidean distances (EDs) between the vowels /i/ and /u (EDiu), /i/ and /a/ (EDia), and /a/ and /u/ (EDau) that define the VSA. The formant frequencies of these metrics were logarithmically scaled to reduce irrelevant interspeaker variability.Results. The VSA failed to differentiate between the TBI and HC groups, as did the the EDia, and EDau. In contrast, the EDiu effectively differentiated between groups, both statistically (unpaired t-test, p=0.0174) and in terms effect size (1.88, large). The significant difference was in the expected direction, indicating vowel centralisation and articulatory undershoot in the TBI speakers.Conclusion. The VSA is likely to perform poorly as an acoustic metric of dysarthric speech because of "noise" introduced by Euclidian distances (EDs) metrics that are not sensitive to the articulatory abnormality (in this study, the EDia and EDau). Thus, rather than using the VSA, it might be more beneficial to use only those EDs that are likely to be sensitive to vowel centralisation, as might be the case with the EDiu.
2
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Correlation Between Vowel Centralisation and Incomplete Stop Articulation in Individuals with Traumatic Brain Injury

100%
Połczyńska M., Tobin Y., Sapir S.
Poznań Studies in Contemporary Linguistics
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2009
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vol. 45
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issue 2
281-299
EN
Traumatic brain injury (TBI) often results in dysarthria, a motor speech disorder. Two processes often linked with TBI dysarthria are vowel centralisation and incomplete stop articulation. It is not clear to what extent these two processes are interrelated and to what extent they might serve as indices of the severity of dysarthria secondary to TBI. The purpose of this study is to test the hypothesis that patients who centralise vowels will also have difficulties producing stop consonants with complete stricture. Polish dysarthric speakers post TBI (n=6) and ten age-matched healthy controls with normal speech (n=10) performed the Polish Dysarthria Test for TBI Patients (PDTTP) (Połczyńska-Fiszer and Pufal 2006). Three of the TBI subjects had moderate dysarthria and three mild dysarthria. The test investigates phonemes in isolation as well as in diverse phonetic contexts in different elicitation tasks, including spontaneous speech. The data from the PDTTP were transcribed phonetically and analysed acoustically. Vowel centralisation and incomplete stop articulation appear to be strongly correlated (r=0.90). It was found that the degree of TBI dysarthria correlates with the frequency of occurrence of these two processes. Thus, the two processes may serve as important indices of severity of dysarthria in TBI.
3

Arvutiparalingvistika valjakutsed ja eesti haale meeldivus

88%
Pajupuu H., Pajupuu J., Altrov R.
Mäetagused
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2017
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vol. 68
195-210
EN
This article looks into tendencies of the last decade in computational paralinguistics: ascertaining of speaker traits and states in voice, and the requirements set for the related speech corpora. It introduces the Estonian voice corpus and the ability to acoustically characterize voice likability and identify it automatically, using the expanded Geneva Minimalistic Acoustic Parameter Set (eGeMAPS) for voice research and affective computing.
4
Content available remote

Od dźwięku do słowa i jeszcze dalej. Red. Katarzyna Wojan, Ewa Konefał. Gdańsk: Wydawnictwo Uniwersytetu Gdańskiego, 2013, ss. 318 + tablice

38%
Ojcewicz G.
Studia Rossica Gedanensia
|
2014
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issue 1
499-501
PL
Artykuł stanowi recenzję księgi jubileuszowej dedykowanej prof. Janinie Bartoszewskiej z okazji jubileuszu 70-lecia urodzin i 45-lecia pracy naukowo-dydaktycznej pt. Od dźwięku do słowa i jeszcze dalej pod redakcją naukową Katarzyny Wojan i Ewy Konefał, wydaną w Gdańsku w 2013 roku.
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