Browsing by Person "Perrier, Pascal"

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An EMMA/EPG study of voicing contrast correlates in German.
(Universitat Autnoma de Barcelona, 2003) Fuchs, Susane; Perrier, Pascal
Except for cavity enlargement strategies there is not much consensus about the involvement of supralaryngeal move-ments in the production of the voicing contrast. In order to study supralaryngeal stop production mechanisms we in-vestigated the kinematics of tongue tip and jaw as well as tongue-palate contact patterns for four German subjects. We took alveolar stops in word medial (Cm) and word final position (Cf) into account. Results from Cm provide evidence that even though acoustic results exhibited consistently a longer closure duration for the voiceless stops, speaker-dependent articulatory mechanisms were involved. In word final position the rule of final devoicing applies in German, i.e. voiced stops are neutralised to voiceless. Results from acoustics and EPG generally showed complete neutralisation, but some differences, par-ticularly in jaw position at the consonantal target and in tongue-jaw coordination, are still maintained.
The Control of Token-to-Token Variability: an Experimental and Modeling Study.
(2001) Mooshammer, Christine; Perrier, Pascal; Fuchs, Susanne; Geng, Christian; Payan, Yohan
The articulatory token-to-token variability in the production of German vowels is investigated with simultaneous EMMA and EPG recordings. The potential role of physical constraints, such as the contacts between tongue and palate measured by EPG, and the biomechanical properties of the tongue, simulated with a 2D finite element model is evaluated. Our results suggest that the control of high front vowels makes use of the palatal contacts, while the variability of low vowels is essentially oriented along the main axis of deformation of the tongue, the high/front-to-low/back direction.
The role of the palate in tongue kinematics: an experimental assessment in VC sequences from EPG and EMMA data.
(2001) Fuchs, Susanne; Perrier, Pascal; Mooshammer, Christine
The effect of palatal contact on tongue tip kinematics was investigated using simultaneous EMMA and EPG recordings. The material consisted of VC sequences, where C is a voiced or voiceless alveolar stop. The kinematic characteristics were studied by analyzing parameters of the velocity profile and the deceleration peaks of the closing gesture. No evidence could be found for a potential influence of lateral contacts. Central contacts, associated with the beginning of the consonantal closure, are strongly correlated in time with the velocity drop. It supports the hypothesis that for achieving a consonantal closure tongue tip kinematics is not controlled by a specific target on the palate, and that its deceleration phase is mostly influenced by the collision with the palate.
WHAT ROLE DOES THE PALATE PLAY IN SPEECH MOTOR CONTROL? INSIGHTS FROM TONGUE KINEMATICS FOR GERMAN ALVEOLAR OBSTRUENTS
(2003) Fuchs, Suzanne; Perrier, Pascal; Geng, Christian; Mooshammer, Christine
ABSTRACT: The tongue moves in a narrow space which influences the speech planning process and affects the kinematic properties of the movement. In order to study the possible role of tongue-palate interaction we investigated tongue tip movement together with tonguepalatal contact patterns by means of simultaneous EMA and EPG recordings. Articulatory data for four German speakers were analyzed. Speech material consisted of VC and VC@ sequences with C being /t/ or /s/ and V being stressed tense /a/ or /u/. The relation between the kinematics of the tongue tip closing gesture and changes in tongue-palatal contact patterns in the anterior, posterior and lateral region were studied. Results for /t/ show a large movement amplitude and a short closing gesture duration whereas in /s/ production the movement amplitude is smaller and the duration longer than in /t/. We conclude that in /t/ the tongue tip hits the palate and this impact stops the movement. In /s/ production we suppose that a precise positioning of the tongue tip is achieved. Speaker dependent tongue-palatal contact patterns can be explained in terms of differences in the palatal shape.