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LINGUIST List 17.806

Thu Mar 16 2006

Diss: Phonetics: Mády: 'Akustische, artikulatorische...'

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        1.    Katalin Mády, Akustische, artikulatorische und perzeptive Parameter in der Konsonantenproduktion nach Zungenteilresektion

Message 1: Akustische, artikulatorische und perzeptive Parameter in der Konsonantenproduktion nach Zungenteilresektion
Date: 16-Mar-2006
From: Katalin Mády <madybtk.ppke.hu>
Subject: Akustische, artikulatorische und perzeptive Parameter in der Konsonantenproduktion nach Zungenteilresektion

Institution: University of Munich
Program: Department of Phonetics and Speech Communication
Dissertation Status: Completed
Degree Date: 2004

Author: Katalin Mády

Dissertation Title: Akustische, artikulatorische und perzeptive Parameter in der Konsonantenproduktion nach Zungenteilresektion

Dissertation URL: http://edoc.ub.uni-muenchen.de/archive/00003060/01/Mady_Katalin.pdf

Linguistic Field(s): Phonetics

Dissertation Director:
Hans-Henning Horch
Hans G. Tillmann

Dissertation Abstract:

In the thesis, acquired organic speech disorders due to oral cavity tumours
are investigated under acoustic, articulatory and perceptual aspects.

Parts of the investigation are new in this field and have an explorative
character, thus it was chosen to keep the number of subjects and the amount
of analysed consonants relatively small (8 males, 4 sounds) and the
analysis as detailed as possible.

Articulatory recordings were done by dynamic MRI in the midsagittal plane
(8 images/sec), and the analysis was based on the distance between tongue
and palate. The acoustic analysis relied on separate recordings and
included parameters which are relevant for the segment characterisation:
duration, relative intensity, and spectral analysis. The study also
involved an auditory evaluation, an acoustic investigation and a
measurement of the overall speech ability by an intelligibility and by a
perception test.

The investigation of the postoperative realisations of the sibilants /s/
and /S/ led to a somewhat surprising result. It is generally thought that
/S/ requires a greater articulatory effort than /s/, what results in a
later acquisition during first language acquisition and in a less universal
character among different languages. However, both the acoustic and
articulatory analysis revealed, that impaired sibilant production almost
always lead to a neutralisation, where the acoustic and articulatory
parameters of /s/ and /S/ overlapped widely and showed the characteristics
of /S/. It seems that the crucial distinctive factor for /s/ and /S/ is
rather the tongue shape than the point of articulation. These findings make
it necessary to re-examine former hypotheses on the differentiation between
alveolar and postalveolar sibilants that are based on a sublingual cavity
(Perkell, Boyce and Stevens, 1979) or on a secondary obstacle (Shadle, 1990).

The most severe production difficulties were connected to the alveolar
lateral /l/. The apical production, that is characteristic for German,
could be achieved only by one of 8 subjects. This could be explained by the
fact that the mobility of the tongue tip was restricted in all other
subjects. Another explanation would be that the function of genioglossus
muscle, that plays a role in the lowering of the tongue body, was actually
impaired in all but one subject. Theories regarding the relation of F1, F2,
and the F2-F3 distance for apical vs. laminal /l/ production cannot be
verified on our data, as the effects that lead to a shift in F1 and F2 are
often contrary regarding the point of articulation and the tongue body

The velar fricative /x/ did not cause a problem to any of the subjects. The
normal production of this sound shows a large articulatory variation (velar
and uvular) and does not require exact tongue movements. The choice of the
velar or uvular allophone seems to vary not only among persons, but also
intra-personally (among recording settings following directly after each
other): for one subject, the MRI showed a velar preoperative articulation,
while the acoustic characteristics referred to an uvular production. It was
observed that the number of uvular realisations was somewhat higher
postoperatively. This might result from the fact that the uvular sound
requires a smaller degree of tongue body elevation than the velar one.

The intelligibility test revealed that the overall perceptual evaluation is
not only influenced by the size and localisation of the resection, but also
a higher speech rate can lead to lower intelligibility scores.

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