Compensatory movement of the tongue following a mechanical perturbation during speech (poster session) - Archive ouverte HAL Accéder directement au contenu
Poster De Conférence Année : 2022

Compensatory movement of the tongue following a mechanical perturbation during speech (poster session)

Résumé

Accurate production of speech sounds is highly desirable for efficient speech communication. This production can be achieved by controlling articulatory posture precisely. While auditory feedback plays a major role in speech processing (Guenther & Hickok, 2015), somatosensory inputs are also important in speech motor control and learning (Tremblay et al 2003, Patri et al., 2020). In a recent study, Ito et al. (2020) showed that tongue posture was rapidly corrected when the tongue was suddenly perturbed by the application of an external horizontal force during sustaining a vowel. Associated with this compensatory response in movement, the spectral characteristics of the perturbed speech sound were also corrected toward those of the original sound. Since this quick compensatory response (< 140 ms for the movement change) was induced faster than a possible cortical auditory feedback loop, it may rely on the sole use of somatosensory information, which would then be tuned toward efficient auditory correction. To assess this hypothesis, we examined whether the quick compensatory response of the tongue is induced in the absence of auditory feedback. We carried out the experiment using tongue perturbation as in Ito et al. (2020), and compared the responses to the tongue perturbation in presence or absence of auditory masking. The experiment consisted in 150 trials. In each trial, the subjects were asked to whisper vowel /e/ for a few seconds. In half of the trials a pink noise was presented to the subject through earphones as auditory masking. In the other half, normal auditory feedback was received (no auditory masking). These two conditions were presented in pseudo-random order. The tongue perturbation was applied using a robotic device, in which a 1 Newton force was applied in the forward direction during 1 second. In order to prevent the subject anticipation of the perturbation, it was applied in randomly selected 15 trials in each auditory condition. Articulatory movements and produced sounds were recorded using ElectroMagnetic Articulography (EMA). EMA sensors were attached to the tongue tip, blade, and dorsum, the upper and lower lips and the lower jaw. The first and second formant frequencies were extracted for acoustical evaluation. All data were aligned at the perturbation onset and averaged across trials and subjects. The investigation is still ongoing. The current data showed that a quick compensatory movement of the tongue was induced in response to the mechanical perturbation as seen in Ito et al. (2020). Similar patterns of the compensatory responses were observed in both auditory feedback conditions. The absence of major difference between both auditory feedback conditions on the early phase of the compensatory movement support our hypothesis that the observed quick feedback is somatosensory rather than auditory in nature. More data will be required to confirm this assumption. The results can support the idea that a speech specific auditory-somatosensory mapping for this compensation can be learned during the speech acquisition period. This learned mapping can be used for the preservation of auditory goals by somatosensory feedback alone.
Fichier principal
Vignette du fichier
Poster_MCsummerSchool_Bourhis_Perrier_Savariaux_Ito.pdf (708.35 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03878361 , version 1 (29-11-2022)

Identifiants

  • HAL Id : hal-03878361 , version 1

Citer

Morgane Bourhis, Pascal Perrier, Christophe Savariaux, Takayuki Ito. Compensatory movement of the tongue following a mechanical perturbation during speech (poster session). Motor Control Summer School # XIX (MCSS-XIX), Jun 2022, Pittsburgh, United States. ⟨hal-03878361⟩
15 Consultations
1 Téléchargements

Partager

Gmail Facebook X LinkedIn More