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Communication Dans Un Congrès Année : 2022

Effect of orofacial somatosensory stimulation in speech perception in relation to speech production performance

Résumé

Orofacial somatosensory inputs modify the perception of speech sounds (Ito et al., 2009, Trudeau-Fisette et al., 2019). This indicates that the somatosensory information associated with speech production can be involved in the processing of speech perception through sensory-motor links. Accordingly, this somatosensory-auditory interaction mechanism can be developed along with the acquisition of speech production. However, it is still unknown whether the effect of somatosensory inputs in speech perception is related to characteristics or level of speech production ability. We here investigated whether the somatosensory effect in vowel perception can be varied depending on the individual characteristics of corresponding vowel production. Somatosensory effect in speech perception was examined using a vowel identification test between French vowels /e/ (unrounded) and /ø/ (rounded) in an 8-member /e/-/ø/ continuum as in Trudeau-Fisette et al., (2019). When presenting a stimulus sound in the vowel identification test, orofacial somatosensory stimulation associated with facial skin deformation was also applied using a robotic device in backwards direction, which can correspond to the articulatory movement for the production of the vowel /e/. The perceptual boundary between /e/ and /ø/ was determined by estimating psychometric function. The somatosensory effect was quantified as a difference in perceptual boundary between two conditions with and without somatosensory stimulations. Speech production characteristics were assessed based on the first, second and third formants (F1, F2, and F3) of the vowels /e/ and /ø/. Those vowels were recorded by the same participants in a separate recording session. Differences between /e/ and /ø/ in each formant were used as production index. We confirmed that orofacial somatosensory stimulation altered vowel categorization and significantly increased the amount of /e/ responses as found in Trudeau-Fisette et al. (2019). We found that amplitude of somatosensory effect in perception was correlated with speech production index in F2 and F3, but not in F1. Since acoustical contrast between /e/ and /ø/ is characterized mostly in F2 and possibly in F3, but rarely in F1, the results showed a clear relationship between somatosensory effect and production ability. This could support the idea that the development of somatosensory function in speech perception can be related to the acquisition of speech production.
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Dates et versions

hal-03813189 , version 1 (13-10-2022)

Identifiants

  • HAL Id : hal-03813189 , version 1

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Monica Ashokumar, Clément Guichet, Jean-Luc Schwartz, Takayuki Ito. Effect of orofacial somatosensory stimulation in speech perception in relation to speech production performance. Summer School: Coping with the complexity in speech production and perception, Jul 2022, Chorin, Germany. ⟨hal-03813189⟩
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