DI-UMONS : Dépôt institutionnel de l’université de Mons

Recherche transversale
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2017-07-01 - Colloque/Présentation - poster - Anglais - 1 page(s)

Delvaux Véronique , Huet Kathy , Piccaluga Myriam , Harmegnies Bernard , "Introducing Inter-Syllabic Interval as an indicator of (dis)fluency in French" in 7th International Conference on Speech Motor Control, Groningen, Pays-Bas, 2017

  • Codes CREF : Psycholinguistique (DI5321), Psychologie de la santé (DI4259), Phonétique (DI5312), Oto-rhino-laryngologie (DI3342), Logopédie (DI3355), Traitement du langage (DI4299), Enseignement des langues étrangères (DI5328), Phonologie (DI5311)
  • Unités de recherche UMONS : Métrologie et Sciences du langage (P362)
  • Instituts UMONS : Institut de recherche en sciences et technologies du langage (Langage), Institut des Sciences et Technologies de la Santé (Santé)

Abstract(s) :

(Anglais) Fluent speech is characterized by appropriate tempo and reduced number of disfluencies. Those disfluencies are mainly silent and full pauses, false starts, and repetitions of sentences and polysyllabic words, signalling issues in linguistic planning and/or monitoring, in relation with cognitive and psycho-affective factors. Other disfluencies typify stuttered speech (although they may also happen in healthy speakers) in association with speech motor control deficits, including single syllable and part word repetitions, and disrhythmic phonations (blocks, prolongations). Other speech motor disorders, typically dysarthrias, are charaterized by a slower articulation rate resulting from impaired motor coordination and reduced speed of articulation. Thus, the concepts of rythm and tempo (articulation rate, speech rate) on one hand, and fluency/disfluencies on the other hand, interrelate in complex ways. One of the consequences is the methodological challenge of setting measures and indicators: Which (types of) disfluencies to include/exclude before computing articulation rate? How to select tresholds to define silent pauses and prolongations? Our team has recently introduced the Inter-Syllabic Interval (ISI) as a potential indicator of fluency in French-speaking healthy and pathological speakers. ISI is defined as the time interval between intensity peaks characterizing consecutive syllabic nuclei in any spoken utterance, free from the necessity to a priori exclude or categorize portions of the speech signal as potential disfluencies. Mean ISI is close to the notion of speech rate: low ISI signals quick tempo and/or short, few silent pauses while high ISI is expected in dysarthric speech. The overall and time-evolving variance of ISI should allow to discriminate between fluent and disfluent speech, and between different types of disfluencies according to the degree to which they affect syllabic rythm. The aim of our research programme is to assess the potential of ISI as an indicator of (dis)fluency in French with respect to: other acoustic measures based on conventional syllabic segmentation; other physiological and articulatory measures; subjective assessments from expert and naive listeners. Targeted populations are healthy speakers, PWS and parkinsonians performing speech production tasks with and without time/cognitive pressure. We present here a first acoustic study performed on 400 healthy francophone speakers, half male half female, of all ages and four dialectal origins. Data were collected using the "MonPaGe" protocol (in this case, the picture description and text reading tasks). We describe results as a function of age, gender and origin, comparing in terms of robustness and cost/benefit ratio statistics on EIS with more conventional measures requiring the a priori detection and classification of disfluencies.