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Poster De Conférence Année : 2022

Compensatory movement of the tongue for speech production with or without masking noise

Résumé

IntroductionIn speech production, achieving a specific acoustical goal is fundamental for the interaction with listeners. Hence the assessment of the task achievement from auditory feedback certainly plays a major role in correcting and learning speech articulation (Guenther & Hickok, 2015). Somatosensory inputs have been also shown to be important in speech motor control (Patri et al., 2020), but the detailed nature of this sensory feedback and its role in speech movement correction is yet unknown. In a recent study (Ito et al, 2020) when the tongue was suddenly pulled forward due to a tongue perturbation, the induced change of tongue posture was rapidly corrected. The spectral characteristics of the perturbed speech sound were also corrected toward those of the original sound. Since this quick compensatory response was induced faster than any possible cortical auditory feedback loop (< 140 ms for the movement change), it may rely on the sole use of somatosensory information, which would then be tuned toward efficient auditory correction. MethodologyIn order to test this hypothesis, we examined whether and how the quick compensatory response of the tongue is induced in the absence of auditory feedback. We carried out the experiment using the same tongue perturbation as in Ito et al (2020), and compared the compensatory responses observed with and without auditory masking. The experiment consisted in 150 trials during which the subjects were asked to whisper vowel /e/ during a few seconds. In half of the trials a pink noise was presented to the subject through earphones so as to mask the auditory feedback. In the other half, normal auditory feedback was received. These two conditions were tested in pseudo-random order. We used a robotic device for the perturbation, in which a 1 Newton force was applied in the forward direction during 1 second. It was applied only in a limited number (15) of randomly selected trials in each auditory condition in order to avoid anticipation. We recorded articulatory movements using ElectroMagnetic Articulography (EMA), in synchrony with the /e/ sound. EMA sensors were attached to the tongue tip (TT), blade (TB), and dorsum (TD), 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. Results and discussionA quick compensatory movement of the tongue was induced in both auditory feedback conditions in response to the mechanical perturbation. The results including acoustic sound are currently processed and will be presented at the conference. We expect that the auditory feedback had no impact on the early phase of the compensatory movement. This would support our hypothesis that the observed quick feedback is somatosensory rather than auditory in nature. A speech specific auditory-somatosensory mapping for this compensation may be learned during the speech acquisition period, maintained throughout speech development and ontogeny and may be used to tune somatosensory feedback alone toward the preservation of auditory goals.
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Dates et versions

hal-03878063 , version 1 (29-11-2022)

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  • HAL Id : hal-03878063 , version 1

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Morgane Bourhis, Pascal Perrier, Christophe Savariaux, Takayuki Ito. Compensatory movement of the tongue for speech production with or without masking noise. SMC 2022 - 8th International Conference on Speech Motor Control, Aug 2022, Groningen, Netherlands. . ⟨hal-03878063⟩
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